Answer:
The amount of work done in order to lift the box is [tex]150\ Joule[/tex]
Explanation:
Given the weight of each box is [tex]100N[/tex]
And the man lifts boxes at a height of [tex]1.5m[/tex]
We need to find the amount of work done.
The amount of work done is the product of applied force [tex]F[/tex] that causes the displacement [tex]d[/tex].
In our problem force is [tex]100N[/tex] and displacement is [tex]1.5m[/tex].
Now, work done
[tex]=force\times displacement\\=100\times1.5\\=150\ Joule[/tex]
So, the amount of work done in order to lift the box is [tex]150\ Joule[/tex]
Twenty students in Class A and 20 students in Class B were asked how many hours they took to prepare for an exam. The data sets represent their
answers
Class A (2,5,7,6,4,3,8.7.4,5,7,6,3,5, 4.2.4.6.3.5)
Class B. (3.7.6. 4.3.2.4,5,6,7.2.2.2.3, 4.5, 2, 2.5,6)
Which statement is true for the data sets?
A.
The mean study time of students in Class A is less than students in Class B.
B.
The mean study time of students in Class B is less than students in Class A
C.
The median study time of students in Class B is greater than students in Class A
D.
The range of study time of students in Class A is less than students in Class B
E.
The mean and median study time of students in Class A and Class B is equal
The answer from the given option is The mean study time of students in class B is less than the students in class A.
Explanation:
Mean is defined as the ratio of the sum of the given terms to the number of the given terms. (i.e. sum divided by the count). In short, it is the average of the number.There are three types of mean:
Arithmetic mean(AM), Geometric mean(GM)Harmonic mean(HM).Here in class A,
Mean in class A = (2+5+7+6+4+3+8+7+4+5+7+6+3+5+4+2+4+6+3+5) / 20
= 4.8.
Mean in class B = (3+7+6+4+3+2+4+5+6+7+2+2+2+3+4+5+2+2+5+6) / 20
= 4.
Hence mean study time of class B is less than the mean study time of class A.
____________occurs when an object travels in a curved path.
Answer:
Acceleration
Explanation:
can you mark me brainlies
So, if an object travels in a curved path, it changes velocity, and, thus, accelerates. This acceleration must be tied to a force. ... Therefore, whenever an object travels in a curved path, there must be an unbalanced force acting upon it. It is important to understand that all this may occur without a change in speed.t
Which of the following best describes the picture shown below?
Answer:
b
Explanation:
its b
As per the image depicted the picture shows us the arrow and the target to be hit.
As per the picture 2 or 3 arrows have been shown in the green region that is quite far form the spot in red. This shows the concept of poor or low accuracy and high precession as all of them are in same place.Hence the option B is correct.
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A book sitting on a shelf has gravitational potential energy. true or false
Answer:
False
Explanation:
A book resting on a shelf has no potential energy relative to the shelf, since it has height of zero meters relative to the shelf.
Answer:
True
Explanation:
When you blink your eye, the upper lid goes from rest with your eye open to completely covering your eye in a time of 0.024 s.
a. Estimate the distance that the top lid of your eye moves during a blink.
b. What is the acceleration of your eyelid? Assume it to be constant.
c. What is your upper eyelid's final speed as it hits the bottom eyelid?
a) Distance moved by the top lid during a blink: 1 cm (estimate)
b) The acceleration is [tex]34.7 m/s^2[/tex]
c) The final speed is 0.83 m/s
Explanation:
a)
For the purpose of this problem, we can estimate the size of the eye from the top lid to the bottom lid to be 1 cm, so this is the distance moved by the top lid during a blink.
b)
Assuming the motion of the eyelid to be at constant acceleration, we can find the acceleration by using the following suvat equation:
[tex]s=ut+\frac{1}{2}at^2[/tex]
where
s is the distance covered
u is the initial velocity
t is the time
a is the acceleration
For the eyelid, we have:
u = 0 (it starts from rest)
s = 1 cm = 0.01 m is the distance covered
t = 0.024 s is the time taken
Solving for a, we find the acceleration:
[tex]a=\frac{2s}{t^2}=\frac{2(0.01)}{0.024^2}=34.7 m/s^2[/tex]
c)
The final speed of the upper eyelid can be found by using another suvat equation:
[tex]v=u+at[/tex]
where
v is the final speed
u is the initial speed
a is the acceleration
t is the time
For the eyelid in this problem, we have
u = 0
[tex]a=34.7 m/s^2[/tex]
t = 0.024 s
Substituting, we find the final speed:
[tex]v=0+(34.7)(0.024)=0.83 m/s[/tex]
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calculate the total surface area of a solid cone of slant height 15cm and base radius 8cm.
Answer:
it's 578 cm
[tex]\pi \times 8 \times 15 + \pi \times {8 }^{2} = 578[/tex]
Explanation:
[tex]surface \: area \: of \: a \: corn = \pi \times radius \times slant \: height + \pi \times {r}^{2} [/tex]
A 40 kg gymnast somersaults into a foam ball pit at a speed of 7 m/s. If the foam applies an average resistive force of 1,000 N, how far into the pit will the gymnast sink before she stops?
The distance covered is 0.98 m
Explanation:
Newton's second law states that the force applied on the gymnast is equal to the product between its mass and its acceleration:
[tex]F=ma[/tex]
where in this case,
F = -1000 N is the force applied (negative since it is opposite to the direction of motion)
m = 40 kg is the mass
a is the acceleration
Solving for a,
[tex]a=\frac{F}{m}=\frac{-1000}{40}=-25 m/s^2[/tex]
Since the motion of the gymnast is a uniformly accelerated motion, we can now apply suvat equations:
[tex]v^2-u^2=2as[/tex]
where
v = 0 is the final velocity of the gymnast
u = 7 m/s is the initial velocity
[tex]a=-25 m/s^2[/tex] is the acceleration
s is the distance through which the gymnast moves before stopping
And solving for s,
[tex]s=\frac{v^2-u^2}{2a}=\frac{0-7^2}{2(-25)}=0.98 m[/tex]
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Using the principles of work and kinetic energy, we can calculate that the gymnast will sink 0.98 meters into the foam pit before coming to a stop.
Explanation:In this physics problem, we are dealing with the principles of work and kinetic energy. The work done to stop the gymnast can be calculated using the formula W=Fxd, where F is the resistive force, and d is the distance. It’s also equal to the change in kinetic energy, which can be found using KE = 0.5mv^2.
To calculate the distance into the pit the gymnast will sink, we first calculate her initial kinetic energy. It’s KE = 0.5*(40 kg)*(7 m/s)^2 = 980 Joules. The work done to stop her (which is equal to her initial kinetic energy) is W = 980 Joules. Now, solve the work equation for distance: d = W/F = 980 Joules / 1000 N = 0.98 m. So, the gymnast will sink 0.98 meters into the foam pit before she stops.
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a single 1,300 jk cargo car is rolling along a train track at 2.0 m/s when 400 kg of coal is dropped vertically into it. what is it’s velocity right afterward? assume a closed system.
Answer:
1.53 m/s
Explanation:
Given:
Mass of the car (M) = 1300 kg
Mass of the coal (m) = 400 kg
Initial velocity of the car (U) = 2 m/s
Initial velocity of the coal (u) = 0 m/s (Since it is dropped)
When the coal is dropped into the car, then they move with same final velocity.
Let the final velocity be 'v' m/s.
For a closed system, the law of conservation of momentum holds true.
So, initial momentum is equal to final momentum of the car-coal system.
Initial momentum of the car = [tex]MU=1300\times 2=2600\ Ns[/tex]
Initial momentum of the coal = [tex]mu=0\ Ns[/tex]
Total initial momentum is the sum of the above two momentums.
So, total initial momentum = 2600 + 0 = 2600 Ns
Now, final momentum is given as the product of combined mass and final velocity. So,
Final momentum of the system = [tex](M+m)v=(1300+400)v=1700v[/tex]
Now, from law of conservation of momentum,
Initial momentum = Final momentum
[tex]2600=1700v\\\\v=\frac{2600}{1700}\\\\v=1.53\ m/s[/tex]
Therefore, the final velocity of either of the two masses is same is equal to 1.53 m/s.
To find the final velocity of the car after the coal is dropped, we can use the principle of conservation of momentum.
Explanation:To solve this problem, we can use the principle of conservation of momentum. The momentum before the coal is dropped vertically into the car is given by the product of the mass and velocity of the car, which is 1,300 kg×2.0 m/s = 2,600 kg×m/s. After the coal is dropped, the total momentum of the system should remain the same since there is no external force acting on it. Therefore, the final velocity of the car can be calculated by dividing the total momentum by the new total mass of the car and coal, which is 1,300 kg + 400 kg = 1,700 kg.
Using the equation:
(initial momentum) = (final momentum)
(1,300 kg × 2.0 m/s) = (1,700 kg × v)
Solving for v, we find that the final velocity of the car after the coal is dropped is approximately 1.529 m/s.
A ship sends out a pulse of sound and receives an echo back one second later. If the water is 750m deep, what is the speed of sound in water?
Answer:
1500 m/s
Explanation:
The sound wave travels 750 meters from the ship to the bottom of the water, then 750 meters back to the ship. So it travels a total distance of 1500 meters in 1 second.
So the average speed is:
v = 1500 m / 1 s
v = 1500 m/s
A rock has a mass of 340.6 kg and a volume of 214 cm^3. Calculate the density
Density = mass/volume
Density = 340.6kg / 214 cm^3
Density = 1.592 kg/ cm^3
Density = 1,592 gram/cm^3
That's about 70 TIMES the density of the most dense natural element (Osmium). This is one verrrry interesting rock !
According to the question,
Mass, m = 340.6 kgVolume, V = 214 cm³We know the formula,
→ [tex]Density = \frac{Mass}{Volume}[/tex]
By substituting the values, we get
[tex]= \frac{340.6}{214}[/tex]
[tex]= 1.592 \ kg/cm^3[/tex]
or,
[tex]= 1592 \ g/cm^3[/tex]
Thus the response above is correct.
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A non-infectious disease is a disease that you can not catch.
True or False
40 pointsss
Answer:
TRUE
Explanation:
Answer: TRUE
Explanation:
Suppose that an object slows down while moving horizontally. In this situation, the
object's kinetic energy would _, its potential energy would _, and its total
mechanical energy would
Enter the three answers in their respective order without any commas or spaces between
letters.
a. Increase
b. Decrease
c. Remain the same
d. Nonsense! It is impossible to tell without more information.
Suppose that an object slows down while moving horizontally. In this situation, the object's kinetic energy would _,(decrease )---- its potential energy would (increase) and its total mechanical energy would (remains the same) .
Explanation:
Energy
It is ability to do work
It is of different types out of which mechanical energy is also one of the type .
Mechanical energy
It is the energy possessed by body due to its position or motion .
It is of two types :
Kinetic energy
Potential energy
Potential energy
It is the energy possessed by body due to its position or state .
It is given by P.E =mx gx h
Kinetic energy
It is the energy possessed by body due to its motion .
It is given by K.E=1/2 mv²
Law of conservation of energy
It states that energy can be converted from one form to another but total energy of the system remains same .
That is why : in above asked question ,when body is moving it has kinetic energy , when stops the kinetic energy gets converted to potential energy , but the total energy of system remains same .
The object's kinetic energy would decrease, its potential energy would increase, and its total mechanical energy would remain the same.
The total mechanical energy (E) of a system is the sum of its kinetic energy (KE) and its potential energy (PE).
E = KE+ PE
conservation of energy:
whenever an object is acted upon by a non-dissipative conservative force its total mechanical energy remains conserved.
So, when the object slows down, its velocity decreases, and therefore its kinetic energy decreases. Since the total mechanical energy remains conserved, the loss in kinetic energy is converted into gain in potential energy, and the potential energy increases.
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Which substance cannot be seperated physically or chemically?
Answer:
What is a Pure Substance?
Explanation:
It is something which cannot be divided into parts by physical means, as it's all made up of the same thing. Pure substances are either elements or compounds. Elements can NOT be separated into other types of matter (physically or chemically).
Answer:
an element
Explanation:
Elements are not able to be separated, but everything else can, whether that be physically or chemically.
Not my work i looked it up, so no copy write please rate!
Which title best reflects the main idea of the passage? The Role of Convection in the Distribution of Earth's Energy The Role of Heat Transfer Methods in the Distribution of Earth's Energy Conduction, Convection, and Radiation: Methods of Heat Transfer Conduction, Convection, and Radiation: The Heating Up of Earth's Surface
Answer:
b
Explanation:
The main idea can be the Role of Heat Transfer Methods in the Distribution of Earth's Energy.
What is main idea of a passage?The main idea of a passage is the central message or information the author is trying to pass to the audience.
The main idea of a passage is the author's main purpose of writing the passage.
From the given options, the main idea of the passage can be determined if the central message of the passage can be deduced.
The main idea can be "The Role of Heat Transfer Methods in the Distribution of Earth's Energy"
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Figure P2.23 is a somewhat simplified velocity graph for Olympic sprinter Carl Lewis starting a 100 m dash. Estimate his acceleration during each of the intervals A, B, and C.
A) Acceleration in part A: [tex]6.1 m/s^2[/tex]
B) Acceleration in part B: [tex]2.7 m/s^2[/tex]
C) Acceleration in part C: [tex]1.5 m/s^2[/tex]
Explanation:
A)
The picture of the problem is missing: find it in attachment.
The acceleration of a body is equal to the rate of change of its velocity:
[tex]a=\frac{v-u}{\Delta t}[/tex]
where
v is the final velocity
u is the initial velocity
[tex]\Delta t[/tex] is the time it takes for the velocity to change from u to v
In part A of the race, we have:
u = 0
v = 5.5 m/s (estimate)
[tex]\Delta t = 0.9 - 0 = 0.9 s[/tex]
So the acceleration is
[tex]a=\frac{5.5-0}{0.9}=6.1 m/s^2[/tex]
B)
In part B of the race, we have:
u = 5.5 m/s is the initial velocity (estimate)
v = 9.5 m/s is the final velocity (estimate)
[tex]\Delta t = 2.4 - 0.9 = 1.5 s[/tex] is the time interval between the two points considered
Therefore, using the equation for the acceleration, we can find the acceleration in part B:
[tex]a=\frac{9.5-5.5}{1.5}=2.7 m/s^2[/tex]
C)
In part C of the race, we have:
u = 9.5 m/s is the initial velocity (estimate)
v = 11 m/s is the final velocity (estimate)
[tex]\Delta t = 3.4 - 2.4 = 1 s[/tex] is the time interval between the two points considered
And therefore, the acceleration in part C of the race is:
[tex]a=\frac{11-9.5}{1}=1.5 m/s^2[/tex]
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Briefly describe the two different categories of mechanics:
Answer:
Statics which is when dealing with forces acting out on body and the possible motives of the body system. Kinetics which explains the motion that can occur in any type of situation.
Explanation:
How to find final velocity
Answer:
Explanation:
The equation or formula for velocity is similar to speed. To figure out velocity, you divide the distance by the time it takes to travel that same distance, then you add your direction to it.
Final answer:
To calculate final velocity, identify the knowns (initial velocity, acceleration, time), determine the unknown (final velocity), use the equation v = vo + at, and solve by substituting values into the equation.
Explanation:
To find the final velocity of an object, you must first:
Identify the known values, such as initial velocity (vo), acceleration (a), and time (t).
Determine the unknown, which is the final velocity (v).
Select the appropriate equation to calculate final velocity. The standard equation used is v = vo + at.
Substitute the known values into the equation and solve for the final velocity.
For example, if the initial velocity is 70.0 m/s, the acceleration is -1.50 m/s², and the time is 40.0 s, you would calculate the final velocity as follows:
v = vo + at = 70.0 m/s + (-1.50 m/s²) (40.0 s) = 10.0 m/s
This calculation reveals that the final velocity of the object after 40 seconds is 10.0 m/s.
you are trying to figure out the voltage of a battery when you know the current and the resistance. the current(i) is 25 Amps, and the resistance (R) is 10 ohms. Use the right form of I=VIR
Answer:
V= 250 volts
Explanation:
V=IR
V=25*10
V=250 volts
Answer: 250 V
Explanation: Ohm's Law is expressed in the given equation:
V = I x R
Substitute the values of I ( current) and R ( resistance)
V = 25 A x 10 ohms
= 250 V
A train travels 55 km south along a straight track in 34 minutes. What is the train's average velocity in kilometers per hour?
Answer: v = 96.5 km/h
Explanation: Solve this problem using the following equation:
v= d/t
First convert t in minutes into hours
34 mins x 1 hour / 60 mins
= 0.57 h
Substitute the values
v = 55 km / 0.57 h
= 96.5 km/h
Add each of the following vectors and find the total resultant.
a. 15 m East and 25 m North.
b. 220 m North and 80 m West.
c. 2.2 m South and 1.8 m North.
d. 150 m East and 180 m South.
e. 45 m South, 30 m East, and 15 m North.
which category are liquids and gases a part of? PLEASE HELP
-compounds
-solutions
-solids
-fluids
Liquids and gases are a part of fluids.
Explanation
Liquids and gases are two states of matter and they differ from solids in terms of close packing of the particles and freedom of movement. The solid particles are closely packed allowing lesser freedom of movement while the particles are not the tightly packed in liquids and gases. gases have greater freedom of movement than solids and liquids and liquids have greater freedom of movement than solids.
Due to this factor liquids and gases can move or flow easily and that is why they are called fluids.
A ball is dropped from the top of a building. When does the ball have the least kinetic energy? (A) after it has hit the ground (B) just before it hits the ground (C) just after it is released (D) half way through the fall
The velocity of the ball is zero at the point of release.
Thus the ball have the least kinetic energy just after it is released.
What is kinetic energy?The energy of the object due to its motion is known as the kinetic energy of that object.
As the ball has some height before it is dropped.
Due to this height the ball posse some potential energy which is equal to the product of its mass, height and the gravitational force.Here kinetic energy is zero.
(A) After it has hit the ground- When the ball hits the ground the kinetic energy becomes maximum and the potential energy of it becomes zero.(B) Just before it hits the ground- As just before it hits the ground the ball achieve the highest speed and least potential energy as the height is almost equals to zero here.(C) Just after it is released-At this point the ball has maximum potential energy due to the highest height it has, but least kinetic energy due to the zero velocity.(D) Half way through the fall- At the halfway the ball has some height, thus it will posses the potential energy. As the ball is dropping it will have the kinetic energy as well. Thus at half way the mechanical energy of the ball is half the potential and half the kinetic energy.Hence the ball have the least kinetic energy just after it is released.
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Answer: After it has hit the ground
Explanation:
I took the K12 test and got it right leave brainliest
If a truck has 40,500 kg*m/s momentum and is moving with a velocity of 90 M/S, what is the trucks mass?
Answer: 450 kg
Explanation: p=mv
m= p/v
m=40500/90
m=450kg
The mass of the truck given that it has a momentum of 40500 Kgm/s and moving at 90 m/s is 450 Kg
What is momentum?Momentum is defined as the product of mass and velocity. It is expressed as
Momentum = mass × velocity
How to determine the mass Momentum = 40500 Kgm/sVelocity = 90 m/sMass =?Momentum = mass × velocity
40500 = mass × 90
Divide both side by 90
Mass = 40500 / 90
Mass = 450 Kg
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Which of the following statements about the nuclear strong force is NOT true?
.The nuclear strong force favors binding protons with protons and neutrons with neutrons
.The nuclear strong force is not affected by the charge of the nucleus
. The nuclear strong force is very strong but only over very short distances.
. The nuclear strong force is responsible for the sun’s nuclear fission reactions.
Final answer:
The incorrect statement about the nuclear strong force is that it is responsible for the sun's nuclear fission reactions. In reality, the strong force is crucial for binding nucleons within nuclei and operates over extremely short distances, but it is not responsible for fission in the sun.
Explanation:
The statement about the nuclear strong force that is not true is: The nuclear strong force is responsible for the sun’s nuclear fission reactions. This is incorrect because the strong force is not responsible for fission in the sun; instead, it plays a crucial role in maintaining the stability of atomic nuclei by binding protons and neutrons together. It is a powerful attractive force that acts over extremely short distances, approximately 10-15 meters, and is much stronger than electrostatic repulsions between similarly charged protons. However, its primary role is not in driving the sun's fission reactions, but in the fusion processes that occur in stars, including our sun.
The correct statements regarding the nuclear strong force are:
The nuclear strong force binds protons and neutrons within an atomic nucleus.The nuclear strong force is not affected by the charge of the nucleus, hence why it can bind positively charged protons despite their electrostatic repulsion.The nuclear strong force is very strong but only acts over very short distances - on the scale of an atomic nucleus.stephanie, who has a mass of 75 kg is driving and suddenly slams on her brakes to avoid hitting a student crossing blanco road. she is wearing her seatbelt, which brings her body to a stop at 0.5 seconds. an average foce of 3750 N is exerted on her body during the collision. how fast was she going before applying the brakes?
Answer:
25 m/s
Explanation:
Impulse = change in momentum
F Δt = m Δv
(3750 N) (0.5 s) = (75 kg) (v − 0 m/s)
v = 25 m/s
A balloon has a volume of 1.5-L at 25*C. What would be the volume of the balloon if it were placed in a container of hot water at 90*C?
Answer:
1.8 L
Explanation:
Ideal gas law:
PV = nRT
where P is absolute pressure,
V is volume,
n is number of moles,
R is the gas constant,
and T is absolute temperature.
Rearranging:
V / T = nR / P
Since n, R, and P are constant:
V₁ / T₁ = V₂ / T₂
1.5 L / (298.15 K) = V / (363.15 K)
V = 1.8 L
Charles's Law is used to find the new volume of a balloon when heated from 25°C to 90°C. Converting these temperatures to Kelvin and solving gives a new volume of 1.83 L.
The question involves understanding how the volume of a gas changes with temperature, governed by Charles's Law, which states that the volume of a gas at constant pressure is directly proportional to its temperature in Kelvin. To find the new volume of a balloon when its temperature is increased from 25°C to 90°C, we first convert these temperatures to Kelvin (°K) because the gas law uses absolute temperatures. The formula to convert Celsius to Kelvin is K = °C + 273.15. Thus, the original temperature is 298.15 K (25 + 273.15), and the new temperature is 363.15 K (90 + 273.15).
Using Charles's Law (V1/T1 = V2/T2), where V1 is the original volume (1.5 L), T1 is the original temperature (298.15 K), V2 is the final volume, and T2 is the final temperature (363.15 K), we can solve for V2. Rearranging the formula gives us V2 = V1 * (T2/T1).
Substituting the given values, V2 = 1.5 L * (363.15 K / 298.15 K) = 1.5 L * (1.218) = 1.83 L. Therefore, the volume of the balloon when placed in a container of hot water at 90°C would be 1.83 L.
A current 1A in the human body is extremely dangerous.
a) Estimate the potential difference needed to produce this current.
b) Suggest why your are unlikely to be injured by an electric current in your house.
Please answer both questions.
a) Potential difference needed: 10,000 V
b) Because the potential difference in the house is maximum 230 V
Explanation:
a)
The relationship between current, potential difference and resistance in a conductor is given by Ohm's law:
[tex]V=RI[/tex]
where
V is the potential difference
R is the resistance
I is the current
The resistance of the human body is estimated to be as high as [tex]100,000 \Omega[/tex] for a dry body and as low as [tex]1000 \Omega[/tex] for a wet body: in this problem, we use a value in the middle,
[tex]R=10,000 \Omega[/tex]
Therefore, the potential difference needed to produce a current of
[tex]I=1 A[/tex]
is
[tex]V=(10,000)(1)=10,000 V[/tex]
b)
Here we want to estimate if it is likely or not to get injured by an electric current in a house.
The amount of current that can be fatal is [tex]I=1 A[/tex]. From part a), we saw that in order to produce this current through the human body, a potential difference of
[tex]V=10,000 V[/tex]
is needed.
However, the electricity that reaches the houses and then is connected to the household appliances has a potential difference of
V = 230 V
This value is much lower than 10,000 V, therefore the electricity in the house is unlikely to cause injures to human body.
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Gina loves to help make dinner for her family. She is helping her mom make spaghetti tonight.
First, they boil a large pot of water on the stove. Then, they put the spaghetti noodles in the pot. They let the noodles cook and then remove the water. Finally, Gina puts sauce on the noodles and is ready to serve dinner.
For which reason are Gina and her mom using water?
A.
to clean
B.
to drink
C.
to prepare food
In an astronomical sense, which is not considered an ice?
hydrogen
carbon dioxide
water
ammonia
PLEASE HELPPP
_______________ is when the bronchial tubes swell up. This is usually cause by some sort of allergy, but exercise and stress can also cause the attack.
a) influenza
b) pneumonia
c) asthma
d) Parkinson's
Answer:
Athsma. Pneumonia is the only other one it could be, but is not brought on the excercise, allergy, stress.
Explanation:
Hope this helps! Happy Trails!