A device consisting of a wheel over which rope or chain is pulled in order to lift a heavy object.
Examples- Elevators use multiple pulleys in order to function. A cargo lift system that allows for items to be hoisted to higher floors is a pulley system
As the current in a coil of wire increased, the magnetic field strength what?
Answer:
A coil of wire with an electric current flowing through it becomes a magnet. Putting iron inside a current-carrying coil greatly increases the strength of the electromagnet. Changing magnetic fields induce electric currents in copper and other conductors.
a drag racing vehicle travels from 0 100 mph in 5 seconds north. What is the acceleration
The formula to find accerelation is:
Accerelation= change in velocity÷change in time
the change in velocity here is: 100mph
the change in time is: 5 seconds
a=100÷5 ms
a= 20ms-2
Answer:
8.94m/s²
Explanation:
Acceleration is defined as the change in velocity of an object with respect to time. Mathematically,
Acceleration (a) = change in velocity(∆v)/time (t) where;
Change in velocity(∆v) = final velocity (v) - initial velocity (u)
a = ∆v/t = v-u/t
Given v = 100mph u = 0mph since the vehicle travels from 0mph to 100mph, t = 5seconds
Since 1mph = 0.447m/s
100mph = 44.7m/s
Substituting this values in the formula given we have;
a = 44.7-0/5
a = 8.94m/s²
Its acceleration is 8.94m/s²
Which has a greater momentum? A 1200kg car traveling at 30m/s or a 2000kg truck traveling at 20m/s
Momentum is found by multiplying the mass of the object by the velocity.
1200 x 30 = 36,000 Newtons
2000 x 20 = 40,000 Newtons.
The 2,000kg truck has greater momentum.
The primary difference between a scientific theory and a hypothesis is that a theory is: A prediction of an experimental outcome Not yet tested Well tested Not yet widely accepted by scientists
A hypothesis is a testable prediction based on observations while a scientific theory is a well-tested, widely accepted explanation of observed phenomena. The process of maturing from a hypothesis to a theory involves thorough testing and validation through the scientific method.
Explanation:The primary difference between a scientific theory and a hypothesis revolves around their levels of validation. A hypothesis is a testable prediction made based on observations. It is an educated guess that attempts to explain observed phenomena and bridges the gap between the realm of ideas and the real world.
On the other hand, a scientific theory is a widely accepted, well-substantiated explanation of some aspect of the natural world that has been affirmed through repeated testing and observation. Scientific theories are more comprehensive and well-established as they are the result of various tests and experiments that support their validity. While hypotheses are the initial, testable predictions, theories are the matured and validated outcomes of those tests.
It's essential to note that scientific theories can still be modified as new data becomes available through continued research and observation. This adaptability is a crucial part of the scientific method.
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Explain why the phrase "by ordinary means" was added to the Law of Conservation of Energy
-it can only be converted from one form to another.
The phrase "by ordinary means" was added to the Law of Conservation of Energy because kind to be expected in the normal order of events.
What is mean by Law of Conservation of Energy and who proposed it?Law of Conservation of Energy law, first proposed and tested by Émilie du Châtelet, means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another. For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodesThe conservation of energy formula goes Ki+Ui=Kf+Uf. U is potential energy and K is kinetic energy..The laws of conservation of energy, momentum, and angular momentum are all derived from classical mechanics.The phrase "by ordinary means" was added The phrase "by ordinary means" was added.
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3. To calculate the _____ of a moving object, divide the displacement by the time interval in which the displacement occurred.
average velocity
instantaneous velocity
initial velocity
negative velocity
Average velocity
Explanation;Average Velocity of a moving body or an object is the ratio of total displacement covered to the time interval during which the displacement occurred. That is; Change in displacement divided by time.The formula, therefore will be;Average velocity = Displacement/ the time interval
Instantaneous Velocity on the other hand is the velocity of an object or a body at some instance.Answer:
Average velocity
Explanation:
Hi, the average velocity of an object is equal to the total displacement of an object divided by the total time spent.
Average velocity = Distance /time
The units used are distance units per time units (for example: meters per second).
Is the rate of the change of position of an object.
Feel free to ask for more if needed or if you did not understand something.
You are cooking a pizza. You place your pizza on a metal tray at room temperature at put it in the oven. When the pizza is cooked you remove the pizza from the oven. Eventually it returns to room temperature again. Describe and explain in detail what happens to the motion of the particles in the metal tray.
when the tray is placed in the oven,the particles get heated their temperature increases hence their kinetic energy therefore the particles vibrate morer vigorously. When the tray is removed from the oven,it's temperature decreases, kinetic energy of the particles decreases hence they vibrate slowly.
What is the IMA of the following pulley system? 1 2 3 4
The answer is 2
I did this question today on my Odyssey ware, and I believe the explanation is that each supporting rope increases the IMA by 1
Answer:
IMA of pulley system is 3
Explanation:
The full form of IMA is ideal mechanical advantage. It is also defined as the ratio of output force to the input force. The mathematical expression is given by :
[tex]IMA=\dfrac{F_r}{F_e}[/tex]
For the pulley system, the IMA is equal to the number of ropes present in the pulley - mass system. So, it is quite easy to find IMA of the pulley i.e. just counting the number of ropes present in the system.
In the given figure, there are three ropes in the system. Hence, its IMA is 3.
In order to move a bag of dog food across a 10 meter room, you apply 20 newtons of force. How much work was done? (2 points)
Work in physics is defined as force times distance (there is also an angle but that doesn’t seem applicable here). In this case:
W = F•d
W = (20 N)(10 m)
W = 200 Nm or 200 joules
200 joules of work was done on the bag of dog food.
Hope this helps!
Answer:
i have seen people put its 2joules, well it not 2, its 200joules bc their asking how much work was done so u need to multiply not dived
Explanation:
Ignore friction and air resistance. If the total mass of the roller coaster cars is 800kg, and the 50,000 N of gravitation force are acting on the roller coaster cars, what is the acceleration of the roller cars?
Force = (mass) x (acceleration) ===> Newton #2
Divide each side by (mass), and then it says:
Acceleration = (force) / (mass)
Acceleration = (50,000 N) / (800 kg)
Acceleration (of gravity) = 62.5 m/s²
.
Now, the only question I have is: WHERE is this coaster ?
The gravity there is almost 6.4 times Earth's gravity.
It's 2.5 times Jupiter's gravity, and 23% of the gravity ON THE SUN !
If you weigh 125 pounds on Earth, you would weigh 7,813 pounds in THAT place. You surely couldn't climb into the coaster or sit in a seat, and the coaster surely could not carry you.
If the index of refraction of a medium is 1.4, determine the speed of light in that medium.
4.2 x 108m/s
2.1 x 108m/s
4.7 x 10-9m/s
4.7 x 108m/s
The refractive index of a medium can be calculated by the use of the angle of incidence and angle of refraction, or the speed of light in air and the speed of light in the medium
The speed of light in air is 3×10⁸m/s.
then n= (speed of light in a air)/(speed of light in the medium.)
1.4=(3ₓ10⁸)/(speed of light in the medium)
speed of light in the medium=3ₓ10⁸m/s÷1.4= 2.1×10⁸m/s
=2.1×10⁸m/s
As part of his meal, a workman has a cup containing a hot drink.
In order to keep the drink hot whilst he eats the rest of his meal, he covers the cup, as shown in
the figure.
Which sources of energy loss does this action reduce? Tick two boxes.
convection from the surface of the liquid
evaporation from the surface of the liquid
conduction through the cup
radiation from the surface of the cup
A workman has a cup containing a hot drink as part of his meal. In order to keep the drink hot whilst he eats the rest of his meal, he covers the cup, because of the evaporation from the surface of the liquid.
What is evaporation?Evaporation occurs in the liquid when the surface of the liquid is open to the surrounding environment. When evaporation occurs, the liquid releases the vapors into the surrounding, which leads to liquid cooling faster than liquid kept in a closed container.
When a hot liquid is placed in a non-insulated environment, it is subjected to a process of heat transfer.As a result, the molecules in the state of liquid get converted into a gaseous state, by evaporation.The higher the temperature of the surrounding, the faster the cooling rate.The evaporation does not stop until the liquid is brought back to room temperature.Hot water has energized atoms that are at an excited state, whereas in the process of reducing temperature the excited atoms get back to their ground state.To learn more about evaporation, refer to:
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A stone falling from a cliff increases speed until it reaches constant velocity, or terminal velocity. What does the stone’s motion tell you about the forces acting on the stone?
Since the stone is moving faster it is pushing through the air faster, which means it is going down faster.
What provides the source of the earth’s magnetic field?
the north and south poles of the earth.
the sun.
the ocean’s electric currents.
the core of the earth.
The explanation accepted by science until now, indicates that Earth's magnetic field is generated in the deepest of the terrestrial nucleus.
This is due to the movements of liquid metals in the core of the planet.
To explain it in more detail:
Right in the center of the Earth there is an internal core of solid iron at a very high temperature, this iron is as hot as the surface of the Sun, however, the pressure caused by the gravity force prevents it from becoming liquid. Around this inner core is the outer core, a layer of approximately 2000 km thick, composed of iron, nickel and small amounts of other metals in liquid state. Due to the lower pressure of the outer core, in relation to the inner core, the metal here is fluid (molten).
The differences in temperature, pressure and composition within the outer core cause convection currents in the molten metal, as the cold, dense matter sinks, and the warm, less dense matter rises. In addition, the Coriolis force, resulting from the spin of the Earth, also causes eddies in this mixture of molten metals.
This is how the movement of liquid iron inside the Earth generates electric currents, which in turn produce magnetic fields, and the spiral caused by the Coriolis force causes the magnetic fields to align in approximately the same direction, being this combined effect added to produce a vast magnetic field that envelops the entire planet.
This field extends from the terrestrial nucleus, progressively attenuating itself in outer space. However, it should be noted that unlike the field of a bar magnet, the Earth's magnetic field changes over time because it is actually generated by the movement of the iron alloys in the Earth's outer core, which causes the poles to move.
Answer: D
Explanation: the guy above gave a good explanation and is right
A neutron of mass 1.7x10^-27 kg travels a distance of 12m in a time interval of 3.6x10^-4 sec assuming speed constant it's Kinetic energy is??
The kinetic energy of the neutron is calculated by using the formula for kinetic energy, KE = 1/2mv^2 with mass 1.7x10^-27 kg and speed 3.33x10^4 m/s. The resulting kinetic energy is 1.88x10^-19 Joules.
To calculate the kinetic energy of a neutron we can use the formula for kinetic energy: KE = 1/2mv^2 where 'm' is mass and 'v' is velocity. We first need to calculate the velocity of the neutron, which we can get by dividing distance (12m) by time (3.6x10^-4 sec). The resulting speed is 3.33x10^4 m/s.Explanation:
Next we use the given mass of the neutron 1.7x10^-27 kg, the speed we've calculated, and the kinetic energy equation. After substitution into the formula we get: KE = 1/2 * (1.7x10^-27 kg) * (3.33 x 10^4 m/s)^2 yielding KE = 1.88x10^-19 Joules.
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an axe used to split wood is driven into a piece of wood a distance of 3.0 cm. If mechanical advantage of the axe is 0.85. how far apart is the wood split?
3.53 cm
Explanation;Mechanical advantage = Input distance/output distance
Input distance = 3.0 cm
Mechanical advantage = 0.85
Output distance = Input distance/Mechanical advantage
= 3.0/0.85
= 3.53 cm
things must ______ for heat to transfer using this type of transfer
Answer:
convection is the answer of question
Answer:
Explanation:
Touch
how many reactants does the following equation have h2o → h2 + o2
A)1
B)2
C)3
A) 1 (one)
Explanation;Reactants are elements and/or compounds that are changed into other substances called products.The reactants are what you start with and the products are the result. In the chemical reaction equation the reactants are on the left and the products are on the right.In this case; H2O is the only reactant, while H2 and O2 are the products.A four-resistor circuit that has three parallel resistors is considered to be what type of circuit?
A. series
B. parallel
C. complex
D. conventional
i think it is C. Complex, although i haven't learned this so long.
A four-resistor circuit that has three parallel resistors is considered to be a type of circuit in parallel. The correct option is B.
When resistors are connected in parallel, they have the same voltage across them but different currents flowing through them.
What is the buoyant force on an object that weighs 340 N and is floating on a lake? if you could explain the answer that would be nice.
You just said that the object is "floating".
(As soon as you said that, a picture of a duck flashed through my mind. But then I knew right away that the duck could not be an accurate representation of the situation you're describing. 340 N would be some duck ... about 76 pounds ... and that duck would have been caught and eaten a long time ago. I mean ... what could a 76-pound duck do ? Could it fly away ? Could it run away ? ? Not likely.)
So it's not a duck, but whatever it is, it's just sitting there on the water, floating. What's important is that it's not accelerating up or down. THAT tells us that the vertical forces on it are balanced so that there's NO NET vertical force on it at all.
What are the vertical forces on it ? There's gravity, pulling it DOWN with a force of 340 N, and there's buoyancy, pushing it UP. The SUM of those two forces must be zero ... otherwise the object would be accelerating up or down.
It's not. So (gravity) + (buoyancy) must add up to zero.
The buoyant force on the object is 340 N UPward.
How does a firm calculate its profit? total revenue minus marginal revenue variable cost plus total cost total revenue minus total cost marginal revenue minus marginal cost
The correct answer is total revenue minus total cost.
When a firm is calculating the profit they need to find the difference between how much money they earned and how much they spent. The difference between their total revenue and their total cost is their profit.
Answer:
The correct option is 3. A firm calculate its profit as " Total profit = Total revenue - Total cost".
Explanation:
Profit of a firm is financial gain. It is the difference between the total amount earned by the firm and the total amount spent in buying, operating, or producing something.
It other words, profit is the difference between total revenue and total cost.
A firm calculate its profit as
Total profit = Total revenue - Total cost
Where, total revenue is the sum of fixed and marginal revenue, total cost is the sum of fixed cost and marginal cost.
A firm calculate its profit as " Total profit = Total revenue - Total cost". Therefore the correct option is 3.
An atom gains an additional electron. What is the overall charge of the ion that is formed?
An is formed when an atom loses or gains one or more electrons. Because the number of electrons in an ion is different from the number of protons, an ion does have an overall electric charge. Consider how a positive ion can form from an atom. The left side of the illustration below represents a sodium (Na) atom
It is a negative ion
Which best explains why the pencil seems bent?
a. light travels slower in air than glass
b. light travels faster in air than in water.
c. light travels at the same speed in all matter
d. Light travels at different speeds in water and in glass.
It travels faster in air than in water.
hope this helps :)
Under which condition does a light ray striking a concave mirror reflect off parallel to the principle axis ?
The answer would be c if u need to know
Answer:
When the incident ray passes through the focal point
Explanation:
A concave mirror has an inward curved surface that reflects the light making it converge at a focal point. It is characterized by the fact that, unlike convex mirrors, concave mirrors show images of different shapes depending on the distance between the object and the mirror.
When the object is at the same focal point, the reflected rays are parallel and never cross, so no image is formed, or in other words, it is reflected parallel to the main axis.
Two balloons are charged with an identical quantity and type of charge:-4 nC. They are held apart at a separation distance of 70 cm. Determine the magnitude of the electrical force of repulsion between them.
Final answer:
To find the repulsive force between two charged balloons, we employ Coulomb's Law, applying given values into the formula to calculate the force based on the charges' magnitudes and separation distance.
Explanation:
The question involves calculating the magnitude of the electrical force of repulsion between two balloons charged with an identical quantity and type of charge (-4 nC), and separated by a distance of 70 cm. To find this, we use Coulomb's Law, which states that the force between two charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them
The formula for Coulomb's Law is given by F = k × (q1 × q2) / r², where F is the force between the charges, k is Coulomb's constant (8.987 ×510¹ N m² C²), q1 and q2 are the magnitudes of the charges, and r is the distance between the charges. Inserting the given values (-4 nC for each charge and 0.7 meters for r):
F = (8.987 × 10¹) × ((-4 × 10⁻⁹) × (-4 × 10⁻⁹)) / (0.7)²
Calculation results in the repulsive force magnitude, which is what the question is seeking. It's important to remember that since the charges are identical in magnitude and type, the force calculated will be repulsive.
What Characteristics do gasses and plasma have in common
Plasma's are a lot like gases, but the atoms are different, because they are made up of free electrons and ions of an element such as neon. Plasma is different from a gas, because it is made up of groups of positively and negatively charged particles. In neon gas, the electrons are all bound to the nucleus.
Hope this helps:)
The specific heat capacity of a substance is the amount of energy associated with doing which of the following to 1kg of the substance?
Answer:
Raising its temperature by [tex]1^{\circ}C[/tex]
Explanation:
The specific heat capacity of a substance is defined as the amount of energy needed to raise the temperature of 1 kg of a substance by [tex]1^{\circ}C[/tex].
The specific heat capacity of a substance essentially tells us how much energy is needed to heat the substance: the larger it is, the more energy is needed. The amount of energy needed to increase the temperature of a substance is given by
[tex]Q=mC_s \DeltaT[/tex]
where
m is the mass of the substance
Cs is the specific heat capacity
[tex]\Delta T[/tex] is the temperature variation of the substance
Answer:
Raising its temperature by 1 C
Explanation:
A P E X
An object in projectile motion will follow which path?
Answer:
curved down toward the ground
Explanation:
A projectile movement is a movement composed of a horizontal movement and a vertical movement. According to Galileo, if an object presents a compound movement, each of the component movements is performed as if the others did not exist and in the same interval of time. This is the principle of simultaneity.
When an object is cast horizontally, it describes a parabolic movement in relation to the Earth. Accordingly, we can conclude that an object in projectile motion will follow a curved path to the ground.
Answer:
B: curved down toward the ground
Explanation:
on edge2021! hope this helps!!~ ~ヾ(＾∇＾)
Which of the following provides evidence that crust is thin under the mid ocean ridge
A. Satellite images
B. Magnetic anomalies
C. Magnetic reversals
D. Gravity anomalies
D. Gravity anomalies.
Out of all choices, Gravity anomalies provide evidence that crust is thin under the mid ocean ridge.
Answer: Option D
Explanation:
Gravity promotes subduction zones. We can perform geological processes with the help of geological processes, because the process in which the oceanic crust moves to the mantle as soon as it collides with the continental crust.
Subduction destroys the ocean's crust, pushing it into the mantle in which it melts. It is said that the ocean's crust is weak because it contains more mafic minerals and is approaching its borders again. If there is a difference between the continental crust, the oceanic crust sank into the mantle.
four cars are required to take a group of 16 students on a trip.If there are 36 students to transport how many cars would be needed?
4 cars = 16 students
? cars = 36 students
let x be the number of cars for 36 students
4 • 36 = 16 • x
144 = 16x
144/16 = x
9 = x
It requires 9 cars for 36 students.
//Hope it helps
To transport 36 students, when 4 cars are required for 16 students, we use a proportion to calculate that nine cars are needed.
Explanation:To determine the number of cars needed to transport 36 students, we can set up a proportion based on the information that four cars are required for 16 students. This is a straightforward arithmetic problem involving ratios. We use the following proportion:
16 students / 4 cars = 36 students / x cars
Solving for x gives us the equation:
16/4 = 36/x
After cross-multiplying, we have:
16x = 36 * 4
16x = 144
To find x, divide both sides by 16:
x = 144 / 16
x = 9
Therefore, nine cars are needed to transport 36 students.
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