Your most likely answer would be D, though, I'm not too sure on it.
However, conduction is present during this process, as well for convection. Convection started up the heating process, and it caused conduction within the pan.
I'm hoping this helps you out.
Answer:
Convection in Step 1 and conduction in Steps 2 and 3
Explanation:
Convection is the fire and the clue word that led me to conduction for steps 2/3 is "touches" it was either Radiation in Step 1 and conduction in Steps 2 and 3 OR Convection in Step 1 and conduction in Steps 2 and 3 and it is not radiation because there is no electromagnetic waves in the flame so its Convection in Step 1 and conduction in Steps 2 and 3, THE LAST ONE, D
HELP ME PLEASE!!! (this is science btw..)
Which of these statements about heating up land and water is true?
a. Land and water are heated to the same temperature.
b. Land is heated through radiant energy.
c. Land heats up slower than water.
d. Land is heated by conduction.
D. Land is heated by conduction
Answer:
Land is heated through radiant energy.
Explanation:
Hope this helps!
What feature of a DMM allows you to connect the test probes in the circuit, remove the probes, and then read the measured value on the display?
A. Diode tester
B. Minimum/maximum feature
C. Delta feature
D. Touch/hold feature
Which direction do electrons travel?
A. They don't move; they simply exchange charge.
B. In either direction, depending on the circuit
C. From positive to negative
D. From negative to positive
A circuit contains a 40 ohm resistor and a 60 ohms resistor connected in parallel. If you test this circuit with a DMM, you should read a total resistance value of
A. 40 ohms.
B. 24 ohms.
C. 2400 ohms.
D. 2.5 ohms
B. 24 ohms. D. Touch/hold feature
D. From negative to positive =negative charges
B. 24 ohms.
in parallel, combined resistance is less than the lowest resistance
Final answer:
The Touch/Hold feature of a DMM allows measurement reading after removing the probes. Electrons travel from negative to positive, and the total resistance of a 40 ohm and 60 ohm resistor in parallel is 24 ohms.
Explanation:
The feature of a Digital Multimeter (DMM) that allows you to connect the test probes in the circuit, remove the probes, and then read the measured value on the display is known as the Touch/Hold feature. When answering the direction electrons travel, they move from negative to positive, which corresponds to conventional current direction from positive to negative in circuit theory.
Regarding the circuit containing a 40 ohm resistor and a 60 ohm resistor connected in parallel, the total resistance value you should read with a DMM is calculated by using the formula for parallel resistance: 1/R_total = 1/R1 + 1/R2. In this case, it would be 1/R_total = 1/40 + 1/60, which gives R_total = 24 ohms after calculating the sum and inverting it.
When does a falling object reach terminal velocity?
At some speed, the drag or force of resistance will equal the gravitational pull on the object. At this point the object ceases to accelerate and continues falling at a constant speed called the terminal velocity (also called settling velocity).
In 1991 four English teenagers built an eletric car that could attain a speed of 30.0m/s. Suppose it takes 8.0s for this car to accelerate from 18.0m/s to 30.0m/s. What is the magnitude of the car's acceleration?
a=Δv/Δt=(30.0-18.0)/8.0=12.0/8.0=1.5 m/s²
Answer:
Acceleration of the car, [tex]a=1.5\ m/s^2[/tex]
Explanation:
It is given that,
Initial speed of the car, u = 18 m/s
Final speed of the car, v = 30 m/s
Time taken, t = 8 s
We need to find the acceleration of the car. Let it is given by a. It can be calculated using the first equation of motion.
[tex]v=u+at[/tex]
Where
a is the acceleration of the car.
[tex]a=\dfrac{v-u}{t}[/tex]
[tex]a=\dfrac{30-18}{8}[/tex]
[tex]a=1.5\ m/s^2[/tex]
So, the magnitude of the car's acceleration is [tex]1.5\ m/s^2[/tex]. Hence, this is the required solution.
what is the difference of a gemstone a rock and Crystal
A gem is a stones that is used to make jewelry. A crystal is apure substance that has molecules arranged in "a regular geometric pattern". A gem can also be a crystal, whereas a crystal can not be a gem.
Hope this helps. <3
4. Why is it better to use data from three or more seismic stations to find the epicenter of an earthquake?
Answer:Data collected from one seismic station can only determine the distance from the epicentre to this station, thus producing a circle with a radius of that distance. If we have two stations, there will be two circles, and these two circles will have two intercepting points (can't determine the exact location). Therefore we need to add another circle, hence another station to know the exact location of the epicentre.
Explanation:
Suppose the exhaust system on a heat engine is not functioning properly. Which statement best explains how this will affect the engine?
The temperature of the gas will not increase during the compression stage.
Burned gases will not be released into the surrounding air.
The fuel-air mixture will not be able to enter the cylinder.
Combustion and subsequent gas expansion will not occur.
Answer:
Option 2)
Burned gases will not be released into the surrounding air.
Explanation:
Given that the exhaust system on a heat engine is not functioning properly.
An exhaust system is a system which transfers waste gases and other combustion products away from an automobile engine.
This system is the reason for the vehicle to operate with minimal noise, smoke and pollution transmitted to the environment.
An improperly maintained exhaust system leads to the storage of burned gases inside only because the system is essential to the clean and efficient operation of the car
So option 2 is right.
Final answer:
The malfunctioning exhaust system will result in burned gases not being released into the surrounding air, interrupting the engine's ongoing cycle of operations. Option B
Explanation:
If the exhaust system on a heat engine is not functioning properly, the most accurate effect this will have on the engine is that burned gases will not be released into the surrounding air.
The exhaust system's primary function is to expel the combustion byproducts, which is crucial for making room for the fresh fuel-air mixture to enter and start the next combustion cycle.
Without this operation, the engine would not be able to sustain the series of intake, compression, combustion, and exhaust cycles that are necessary for continuous operation.
Increasing the amount of current that flows through a wire ______ the strength of an electromagnet
Electromagnet is in form of solenoid
and the magnetic field due to solenoid is given as
[tex]B = \mu_0 n i[/tex]
here
i = current in the loop
so when we increase the current in electromagnet the magnetic field of the solenoid will increase
this will increase the strength of the electromagnet
so the answer would be
INCREASE
Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power? Nuclear power has come under higher scrutiny in recent years. Which statement would make the strongest argument for the use of nuclear power?
Nuclear power generates large amounts of power with limited production of greenhouse gases.
is the answer
Answer: Nuclear power generates large amounts of power with limited production of greenhouse gases.
Explanation:
How many turns are in the secondary coil of a step up transformer that increases voltage from 30 V to 150 V and has seven turns in the primary coil?
To increase the voltage from 30 V to 150 V with seven turns in the primary coil of a step-up transformer, the secondary coil would need to have 35 turns.
The subject of the question is the calculation of the number of turns in the secondary coil of a step-up transformer which is used to increase the voltage from 30 V to 150 V. When working with transformers, we apply the transformer equation which relates the number of turns in the primary coil (Np) to the number of turns in the secondary coil (Ns), as well as the primary voltage (Vp) to the secondary voltage (Vs):
Vp / Vs = Np / Ns
Using the values provided in the question, we have 30 V for the primary voltage (Vp) and 150 V for the secondary voltage (Vs). Also, there are seven turns in the primary coil (Np). Plugging these values into the formula, we can solve for Ns (number of turns in the secondary coil):
30 V / 150 V = 7 turns / Ns
Cross multiply to find:
Ns = (150 V * 7 turns) / 30 V
Ns = 1050 turns / 30
Ns = 35 turns
Therefore, the secondary coil would need to have 35 turns to achieve the desired step-up in voltage.
the velocity of a car changes from 60 meters per second north to 45 meters per second north in 5.0 seconds. The magnitude of the car's acceleration is
Acceleration is slower, so it's going to be negative:
a=Δv/Δt=(v-v₀)/t=(60-45)/5.0=15/5.0=3 m/s²
Answer:
Acceleration of the car is 3 m/s^2
Explanation:
Given that,
Initial speed of the car, u = 60 m/s (towards north)
Final speed of the car, v = 45 m/s (towards north)
Time taken, t = 5 s
To find :
The magnitude of the acceleration of the car.
Solve :
Let a is the acceleration of the car. It is equal to the rate of change of velocity. Its formula is given by :
[tex]a=\dfrac{v-u}{t}[/tex]
[tex]a=\dfrac{(45-60)\ m/s}{5\ s}[/tex]
[tex]a=-3\ m/s^2[/tex]
[tex]|a|=3\ m/s^2[/tex]
Negative sign shows the car is decelerating.
Therefore, the magnitude of the car's acceleration is 3 m/s^2.
Gravity can be described as (2 points)
an magnetic force found in nature.
the force that moves electrical charges.
the force that repels object with like charges.
the force of attraction between two objects
Answer:
"the force of attraction between two objects"
Explanation:
According to Newton's Universal Law of Gravitation, gravity is a force of attraction acting between objects that possess mass. The fact that we only observe gravitational attraction (as opposed to repulsion) makes gravity unique among the known forces.
Answer:
the force of attraction between two objects
Explanation:
an object with a mass of 20 kg has a net force of 80 Newtons acting on it what is the acceleration of the object
Force = mass × acceleration
We know that the force is 80 Newtons and our mass is 20 kilograms therefore by substituting those values in our equation we have:
[tex]F=ma\\\\a=\frac{F}{m}=\frac{80N}{20kg}=4m/s^2[/tex]
Therefore the acceleration is 4 m/s^2.
Using Newton's second law of motion, the acceleration of an object with a mass of 20 kg and a net force of 80 Newtons on it can be calculated by dividing the net force by the mass. Thus, the acceleration of the object is 4 m/s².
Explanation:The question is asking for the acceleration of an object with a given mass and net force acting on it. According to Newton's second law of motion, the acceleration of an object is the net force acting on it divided by its mass. Thus, to find the acceleration, we use the formula F = ma, where F is the net force, m is the mass, and a is the acceleration.
For an object with a mass of 20 kg and a net force of 80 Newtons acting on it, we replace F with 80 N and m with 20 kg, and solve for a:
a = F/m = 80 N/20 kg = 4 m/s².
So, the acceleration of the object is 4 meters per second squared (4 m/s²).
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what gives you a measurement of H + ions in osolutions
Answer:
pH is a measure of the hydrogen ion concentration in an aqueous solution. Essentially, pH measures acidity and alkalinity on a scale from 0.0 to 14.0.
When the speed of the bottle is 2 m/s, the KE is kg m2/s2. When the speed of the bottle is 3 m/s, the KE is kg m2/s2. When the speed of the bottle is 4 m/s, the KE is kg m2/s2. When the speed of the bottle is 5 m/s, the KE is kg m2/s2. When the speed of the bottle is 6 m/s, the KE is kg m2/s2.
instructions
In this part of the experiment, you will be changing the speed of the bottle by dropping it from different heights. You will use the same mass, 0.250 kg, for each trial, so record this mass in Table B for each velocity. Then, calculate the expected kinetic energy (KE) at each velocity. Use the formula KE = mv2,
where m is the mass and v is the speed. Record your calculations in Table B of your Student Guide.
mass of the bottle in each case is M = 0.250 kg
now as per given speeds we can use the formula of kinetic energy to find it
1) when speed is 2 m/s
kinetic energy is given as
[tex]K = \frac{1}{2}mv^2[/tex]
[tex]K = \frac{1}{2}(0.250)(2)^2 = 0.5 J[/tex]
2) when speed is 3 m/s
kinetic energy is given as
[tex]K = \frac{1}{2}mv^2[/tex]
[tex]K = \frac{1}{2}(0.250)(3)^2 = 1.125 J[/tex]
3) when speed is 4 m/s
kinetic energy is given as
[tex]K = \frac{1}{2}mv^2[/tex]
[tex]K = \frac{1}{2}(0.250)(4)^2 = 2 J[/tex]
4) when speed is 5 m/s
kinetic energy is given as
[tex]K = \frac{1}{2}mv^2[/tex]
[tex]K = \frac{1}{2}(0.250)(5)^2 = 3.125 J[/tex]
5) when speed is 6 m/s
kinetic energy is given as
[tex]K = \frac{1}{2}mv^2[/tex]
[tex]K = \frac{1}{2}(0.250)(6)^2 = 4.5 J[/tex]
Record your calculations in Table B of your Student Kinetic energy is the half of the product of mass and square of velocity. If the mass is given which is 0.250 kg. By putting values in the formula we will get values of the kinetic energy of different speeds. Kinetic energy depends upon the mass and velocity of the objects. When the speed of the bottle is 2 m/s, the KE is kg m2/s2. When the speed of the bottle is 3 m/s, the KE is kg m2/s2. When the speed of the bottle is 4 m/s, the KE is kg m2/s2. When the speed of the bottle is 5 m/s, the KE is kg m2/s2. When the speed of the bottle is 6 m/s, the KE is kg m2/s2.
MASS(kg) SPEED(m/s) FORMULA KINETIC ENERGY(kgm2/s2)
0.250 2 = ½ (0.250)(2)^2 0.5
0.250 3 = ½ (0.250)(3)^2 1.125
0.250 4 = ½ (0.250)(4)^2. 2
0.250 5 = ½ (0.250)(5)^2 3.125
0.250 6 = ½ (0.250)(6)^2 4.5
4x10^5+3.3x10^6 what is the answer
3700000 no problem ok
A mouse with curled whiskers migrates from one forest community to another
What? What is the question??
A mouse with curled whiskers migrates from one forest community to another?
Is there a question?
What force is needed to keeps 20kg box moving at a constant velocity when the mk is 0.3021 and the force is a push at 20 degree to the ground
Answer:
63.0 N
Explanation:
According to Newton's second law, the resultant of the forces acting along the horizontal direction is equal to the product of mass and acceleration:
[tex]F_{net}=ma[/tex] (1)
The box is moving at constant velocity, so the acceleration is zero: a=0, and so the net force is also zero.
The net force consists of two forces:
- The horizontal component of the push, given by:
[tex]F_x = F cos \theta[/tex]
where [tex]\theta=20^{\circ}[/tex]
- The frictional force, acting in the opposite direction of the push:
[tex]F_f = \mu mg[/tex]
where [tex]\mu=0.3021[/tex] is the coefficient of friction, m=20 kg is the mass of the box and g=9.8 m/s^2.
Therefore, eq.(1) becomes
[tex]F_x - F_f =0\\F cos \theta - \mu mg =0[/tex]
From which we find the push, F:
[tex]F=\frac{\mu mg}{cos \theta}=\frac{(0.3021)(20 kg)(9.8 m/s^2)}{cos 20^{\circ}}=63.0 N[/tex]
To keep a 20kg box moving at a constant velocity, a force of 58.836 N is needed.
Explanation:To keep a 20kg box moving at a constant velocity, we need to apply a force equal to the force of friction. The force of friction is calculated by multiplying the coefficient of friction (0.3021) by the normal force on the box. The normal force is equal to the weight of the box, which is 20kg multiplied by the acceleration due to gravity (9.8 m/s²). Therefore, the force of friction is (0.3021)(20kg)(9.8 m/s²) = 58.836 N.
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Newton’s 3rd law of motion states that “every action has an equal and opposite reaction.” A golf ball was hit with a force of 200 N forward. Explain how this relates to Newton’s 3rd law of motion.
Answer:
Example of Newton's III law
In the, golf the ball was hit by a club with certain force. As the club hits the ball it's the action. When the ball flies away its the reaction. When a person swings a golf club at the ball, when it hits the ball, it causes the ball to roll up the face of the club and into the air towards the target.sodium undergoes beta decay and becomes magnesium, write an equation. please help...
Remark
There are 2 kinds of Beta Decay. This one is an example of a neutron becomes a proton and the emitted particle is an electron.
[tex]_{11}^{23}\text{Na}\longrightarrow_{12}^{23}\text{Mg}+_{-1}^{ 0}\text{1e-}[/tex]
If a circuit has a voltage of 250 volts and a resistance of 25 ohms, what are the amps for the current in the circuit?
Using Ohm's law, which is I = V / R, for a circuit with 250 volts and 25 ohms, the current is calculated to be 10 amps.
Explanation:If a circuit has a voltage of 250 volts and a resistance of 25 ohms, we can calculate the current in amps using Ohm's law, which states that I = V / R (where I is current, V is voltage, and R is resistance). In this case, the current I equals 250 volts divided by 25 ohms, which equals 10 amps. Therefore, the circuit would have a current of 10 amps flowing through it.
Final answer:
To calculate the current in the circuit, use Ohm's law: current (I) = voltage (V) divided by resistance (R). In this case, the current in the circuit is 10 amps.
Explanation:
To calculate the current in the circuit, you can use Ohm's law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is 250 volts and the resistance is 25 ohms. So, the current can be calculated as:
I = V/R = 250 V / 25 Ω = 10 amps
So, the current in the circuit is 10 amps.
HELP ASAPPPPPPPP!!!!!***worth 100 points***
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Sally walks 10 meters forward and then 5 meters backwards. Which statement most accurate describes the magnitude of her displacement and distance travelled? A) Sally's displacement is 5m less than her distance travelled. B) Sally's displacement is 10m less than her distance travelled. C) Sally's displacement is 5m greater than her distance travelled. D) Sally's displacement is 10m greater than her distance travelled. Free fall is a situation in which the only force acting upon an object is gravity. Why do all objects in free fall have the same acceleration? A) their masses are always the same B) acceleration due to gravity is always the same C) the distance between two objects is always the same D) the gravitational force between two objects are always the same
Displacement is a vector which means it has direction and can have positive or negative values. Distance is a scalar which means it has no direction and positive only.
Sally walks 10 meters forward and then 5 meters backwards. Forward is postive and backward is negative. Her displacement is +10+(-5) = +5m and her distance is 10+5=15m. So the answer is B) Sally's displacement is 10m less than her distance travelled.
Newton 2nd law states that force = ma. In free fall, the only force is gravity force which is equal to mg where g is gravitational acceleration. The acceleration is always the same because B) acceleration due to gravity is always the same.
Sally walks 10 meters forward and then 5 meters backwards.
forward + backward -
displacement= +10 -5 = +5
distance= 10 + 5 = 15
15-5=10m
so B) Sally's displacement is 10m less than her distance travelled.
Free fall is a situation in which the only force acting upon an object is gravity. force=massxacceleration n gravity force=massx gravity acceleration
so acceleration=gravity acceleration=constant.
ans is B) acceleration due to gravity is always the same
How much power is required to lift a 70 kg bed to the top of a 4 meter flight of stairs in 12 seconds?
Given that:
mass (m) = 70 Kg ,
height (h) = 4 m = S ,
time (t) = 12 s,
Determine Power P = ?
P = rate of doing work = Work ÷ time
Work = F × S Joules
= (70 × 9.81 ) × 4 since F = m.g
= 2746.8 × 4
= 10987.2 J
Work = 10.98 KJ
Now, Power = 10.98 ÷ 12
P = 0.915 KW or 915 W
Answer:
Power, P = 228.67 Watts
Explanation:
It is given that,
Mass of bed, m = 70 kg
It is lifted to a top of 4 meter i.e. h = 4 m
Time taken, t = 12 seconds
We have to find the power required to lift the bed. The work done per unit time is called power. Mathematically, it is given by :
[tex]P=\dfrac{W}{t}[/tex]
[tex]P=\dfrac{mgh}{t}[/tex]
[tex]P=\dfrac{70\ kg\times 9.8\ m/s^2\times 4\ m}{12\ s}[/tex]
P = 228.67 watts
Hence, the power required to lift the bed is 228.67 Watts.
HELP WORTH 20 POINTS
1. What are the traditional states of matter, and what type of property is a matter’s state?
2. What are two parts of the atomic theory of atoms?
3. Explain in your own words what an atom and element are.
4. What is a scientific theory?
5. How does the state of plasma compare to the other states of matter?
6. What is plasma? Give a couple of examples of where to find plasma.
Explanation :
1. Four types of traditional state of matter.
Solid state : in this state , the molecules of the matter very close to each other that means molecules closely bound together. they are not capable to move. in solid, particles have very low kinetic energy. solid have definite shape.
Liquid state : In this state, the molecules of the matter are far away to each other. They are capable to move. in liquid , particles have more kinetic energy . liquid have a definite volume.
Gases state : In this state, the molecules of the matter are not bound together that means the molecules are free to move . they have high kinetic energy .
gas has no definite volume and no definite shape.
Plasma state : Plasma consist of charged particle with high kinetic energy.
2. Two parts of the atomic theory of atoms.
(I). All matter is made of atom.
(II). Compounds are made by the combination of two or more different type of atoms.
3. Element is a matter which is made by the atoms.
Example : hydrogen is made by one proton and one electron.
So, we can say that hydrogen is the element and one proton and one electron are the atoms.
4. Scientific theory : Scientific theory is based on the real fact and logical system of science. this theory is experimentally proof.
Scientific theory is always true .
5. Plasma is the different state from the other state of matter. Because plasma made by the group of positive and negative charge particle.
6. Plasma : Plasma is the one state of the matter. it is consist of charged particles which have high kinetic energy .
Example : stars, lighting
In order to walk barefoot on hot coals without hurting your feet
Before a person walks through burning coal, the person will make sure their feet are very wet. When they start walking on the coal, this moisture will evaporate and form a protective gas layer underneath the person's feet. You can see examples of this if you happen to drip some water on a hot stove or any very hot surface. The water will very easily glide around on top of a newly formed layer of air underneath it -- like air hockey pucks on an air hockey table. Note that when someone walks through burning coal, typically this is also done very quickly to prevent a great deal of exposure to possible harm. By walking quickly, thinking positively, and letting the water cushion you from immediate danger over a short distance, such a task is possible. You may have also heard of physics teachers demonstrating how this principle works by sticking their hand first in a bucket of water and then quickly in a bucket of boiling molten lead. In the lead, their hand is protected briefly by a layer of gas from the evaporated water (the water vapor). I'm fairly sure that there is a name for this particular layer of gas, but I'm afraid the name is beyond me at the moment. In other words, water vapor has a low heat capacity and poor thermal conduction. Very often, the coals or wood embers that are used in fire walking also have a low heat capacity. Sweat produced on the bottom of people's feet also helps form a protective water vapor. All of this together makes it possible, if moving quickly enough, to walk across hot coals without getting burned. WARNING: Do not attempt to perform any of the actions described above. You can seriously injure yourself. Answered by: Ted Pavlic, Electrical Engineering Undergrad Student, Ohio St. (citing my source)
The sensation of feeling cold while walking barefoot on a tile floor after being on a carpet can be explained by the different rates of heat transfer. Conduction is the main mechanism at play, where heat is transferred through direct contact between objects. The tile floor conducts heat more effectively than the carpet, leading to a quicker loss of heat from the feet.
Explanation:The sensation of feeling cold on the kitchen tile floor after walking barefoot across the living room carpet can be explained by different rates of heat transfer. Heat is transferred through three main mechanisms: conduction, convection, and radiation. In this case, conduction is the main mechanism at play.
Conduction is the transfer of heat through direct contact between objects. The rate of heat transfer through conduction depends on factors such as the temperature difference between the objects, the thermal conductivity of the objects, and the contact area between the objects.
In the given scenario, the tile floor conducts heat more effectively than the carpet, causing a quicker loss of heat from the feet in contact with it. This makes the sensation of cold more intense compared to the carpet.
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how did sonar contribute to discoveries about the ocean bottom
Answer:
Sonar can be used to measure the depth of the ocean bottom
Explanation:
Sonar is a device which uses ultrasound waves to measure the depth of the ocean.
When a sonar is used on a boat, the device emits an ultrasound wave. This wave travels from the boat to the bottom of the ocean, then it is reflected and travels back to the boat. By knowing the speed of the sound wave in water, and by measuring the time it takes for the wave to come back, one can measure the depth of the ocean. In fact:
- v is the speed of the sound wave in water (approximately 1500 m/s)
- t is the total time it takes for the wave to leave the sonar and come back
- d is the distance between the boat and the bottom of the ocean
The sound wave takes a time t to cover twice the distance between the boat and the bottom of the ocean (2d), so we have
[tex]v=\frac{2d}{t}[/tex]
So we can calculate the depth of the ocean:
[tex]d=\frac{vt}{2}[/tex]
For which job would a noise canceling device be the most beneficial?
a doctor detecting diseases
a veterinarian studying injuries in animals
a food scientist testing the preservation of food
a carpenter using saws and cutting tools
A carpenter using saws and cutting tools as the tools make loud noises.
Answer:
a carpenter using saws and cutting tools
Explanation:
In noise cancelling system we know that two sounds are cancelled just by using the concept of destructive interference.
Here when two sounds which are in opposite phase are superimposed with each other then due to this superposition of waves the resultant intensity will be less than the intensity of any individual wave.
This phenomenon is known as destructive interference.
This is used to decrease the level of sound in such a part of work where we have large sound in output so here correct answer will be
a carpenter using saws and cutting tools
This is because it produce large noise while we use this cutting tools
Sandra moves 14 m in 2 minutes. What is Sandra’s average velocity?
1.98 m/s
0.23 m/s
0.78 m/s
2.56 m/s
Please help.
Given that,
Distance, s = 14 m
Time, t = 2 minutes = 2*60 = 120 s
Velocity = ?
Since, we know that,
Velocity = Distance / time
V = s/t
V = 14/ 120
V= 0.11667 m/s
The average velocity of Sandra will be 0.11667 m/s
Sandra’s average velocity is 0.1166 m/s
Explanation:
Velocity is a vector quantity and it is defined as the rate of change in displacement with respect to time. So ratio of displacement to time taken for that displacement or distance covered will give the magnitude of velocity.
Average velocity is defined as the average of different velocities exhibited by the object to cover different distances in different time intervals. As here only one distance and one time interval is given, average velocity of Sandra will be equal to the magnitude of velocity of Sandra.
So as Sandra moves 14 m distance in 2 m time, the velocity is
[tex]\text {Average velocity }=\text {Magnitude of Velocity}=\frac{\text {Distance}}{\text {Time}}[/tex]
As the time is given in the units of minute, it should be converted to seconds. So the next step will be
[tex]\text { Average Velocity }=\frac{14 \mathrm{m}}{2 \times 60 \mathrm{s}}[/tex] = 0.1166 m/s
Bias Is a personal is very personal prefernce Or dislike of a particular idea based on personal beliefs instead of evidence
True
False
I would say the answer is true
An airplane has a velocity of 907 km/hr westward relative to the air. If the air is moving eastward at 82 km/hr, what is the velocity of the airplane relative to the ground?
A.
989 km/hr eastward
B.
825 km/hr eastward
C.
989 km/hr westward
D.
825 km/hr westward
Answer:
D. 825 km/hr westward
Explanation:
In order to solve the problem, we should define a positive and a negative direction for the velocities.
Let's take positive (+) as westward and negative (-) as eastward.
1) Relative to the ground, the air is moving eastward at 82 km/h, so the air velocity is [tex]v'=-82 km/h[/tex]
2) Relative to the air, the airplane is moving westward at 907 km/h, so its velocity is [tex]v=+907 km/h[/tex]
In the reference system of the ground, the velocity of the airplane will be given by the velocity of the airplane in the reference system of the air (v) plus the velocity of the reference system of the air relative to the ground (v'):
[tex]V=v+v'[/tex]
Therefore, substituting:
[tex]V=907 km/h+(-82 km/h)=+825 km/h[/tex]
And the sign (+) means its direction is westward.