A woman runs up a flight of stairs. The gain in her gravitational potential energy is 1000 J. If she runs up the same stairs at half the speed, her gain in gravitational potential energy will be...

Q: Along a straight horizontal track, a roller-coaster car is moving at 25 m/s. As shown in the figure…

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Q: You give 90 J of kinetic energy to a 1 kg stone when you throw it. By how much do you increase its…

A: The energy gained by the stone = 90 Joules. Mass of the stone (m) = 1 kg.

Q: A force of 8 lb is required to hold a spring stretched 4 in. beyond its natural length. How much…

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Q: A 310g stone is raised to a height of 29m. the gravitational potential energy (in Joule) of the…

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Q: A 5.0 kg book is held 1.0 m above the floor for 50 sec. The work done on the book is ?

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Q: A 230g stone is raised to a height of 15m. the gravitational potential energy (in Joule) of the…

A: Gravitational potential energy    PE = kg x 9.8 m/s2 x m = joules.

Q: Your job is to lift 30-kg crates a vertical distance of 0.90 m from the ground onto the bed of a…

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Q: How High Can We Jump? The maximum height a typical human can jump from a crouched start is about 60…

A: height, h = 60 cm =0.6 m  mass, m = 72 kg

Q: - A weight-lifter does 4.4 x 10³ J of work in raising a weight from the floor to a height of 2.0…

A: Given  Work (w) = 4.4 × 103 J  Height (h) = 2 m  (a) let average force is ' F ' .   w = F× h…

Q: A 5.0 kg mass is falling from a height of 10.0 m with a speed of 2.0 m/a what is it's totally…

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Q: What is the kinetic energy in joules of a 850 kg automobile traveling at 95 km/h? How much work…

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Q: How much kinetic energy does a 5.0 kg object have when it is moving at 3.0 m/s? By what factor does…

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Q: A 1000 kg car moves with a speed of 20 m/s. Suddenly the driver slows to 7 m/s, what is the work…

A: The mass of the car, m is 1000 kg. The initial speed of the car, u is 20 m/s. The final speed of the…

Q: A 70 kg person runs up a staircase 3.0 m high in 3.5 s.  How much horsepower does he develop in…

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Q: A 260g stone is raised to a height of 27m. the gravitational potential energy (in Joule) of the…

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Q: A 62.6 kg runner has a speed of 5.10 m/s at one instant during a long-distance event. How much net…

A: We know:

Q: Does the work required to lift a book to a high shelf depend on how fast (in seconds) you raise it?…

A: We know that the work done is given by  W = FSCosΘ   ---->(1) Where F is the force  S is the…

Q: a helicopter lifts a 100kg crate straight up via cable, with an acceleration of 0.8m/s. if the crate…

A: mass = 100 kg acceleration = 0.8 m/s2distance = 5 m Apparent weight = m(g+a) = 100 (10+0.8) = 1080 N…

Q: A 210g stone is raised to a height of 26m. the gravitational potential energy (in Joule) of the…

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Q: A cyclist in a race must climb a 4° hill at a speed of 5 m/s. If the mass of the bike and the biker…

A: The mass of the bike and the biker together, m=73 kg   The speed, v=5 m/s   The angle, θ=4°

Q: A 340g stone is raised to a height of 20m. the gravitational potential energy (in Joule) of the…

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Q: A car travelling at a speed of 60 km/h has a kinetic energy of 200 kJ. If the speed of the car is…

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Q: A 250g stone is raised to a height of 19m. the gravitational potential energy (in Joule) of the…

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Q: A spring with a spring constant k = 852 N/m is compressed from its unstretched length to a length of…

A: The potential energy of the spring is given by 0.5kx^2            where k= spring constant…

Q: A child drags a toy behind him on the ground. The coefficient of friction is 0.44 and the toy is…

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Q: A car travelling at a speed of 60 km/h has a kinetic energy of 200 kJ. If the speed of the car is…

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Q: How much work is required to lift a 4.5 kg backpack 2.0m to put it on ?

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Q: Two identical golf carts move at different speeds. The faster cart has twice the speed and therefore…

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Q: You throw a 2.3 kg ball straight up into the air and catch it again in your hands. Where in the…

A: The potential energy of an object is given by the equation: P = mgh where "m" is the mass of the…

Q: If it requires 9.0 J of work to stretch a particular spring by 2.0 cm from its equilibrium length,…

A: The energy required to stretch the spring is

Q: At what speed does a 1000 kg compact car have the same kinetic energy as a 20,000 kg truck going 25…

A: Given: The mass of car is 1000 kg. The mass of truck is 20000 kg. The speed of car is 25 km/h.

Q: What is the average power supplied by a 60 kg person running up a flight of stairs a vertical…

A: The person’s average power can be determined as, Here, W and t represent the work done and the…

Q: How much work does a 52-kg woman do against gravity when climbing from the bottom to the top of a…

A: Given: Mass of the woman, m =  52-kg. Height of the staircase, h = 2.8 m.   To Find: The work done.

Q: A 20 kg roller-coaster car is moving at 25.1 m/s along a straight horizontal track. What will its…

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Q: You were told that on top of the skyscraper that you are in, the gravitational potential energy at…

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Q: A girl and her bicycle have a total mass of 40.0 kg. At the top of the hill her speed is 5.0 m/s,…

A: Concept:        The work energy theorem says that           work done by all the forces= change in…

Q: A ball of mass 0.80 kg is dragged in the upward direction on an inclined plane. What is the height…

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Q: A 1000 kg car whose speed is 80 km/h (22.2 m/s) has how much kinetic energy?

A: Given data:  Mass (m) = 1000 kg Speed (v) = 22.2 m/s Required: The kinetic energy (KE)

Q: A car travelling at a speed of 60 km/h has a kinetic energy of 200 kJ. If the speed of the car is…

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Q: Why does the force of gravity does no work on a car that rolls down a hill but no work when it rolls…

A: Actually there is a small mistake in the given question. The question is the force of gravity does…

Q: On a playground slide, a child has potential energy that decreases by 1000 J while her kinetic…

A: The dissipative force involved during sliding motion is the frictional force between the ground and…

Q: An object which weighs 10 N is dropped from rest from a height of 4 meters above the ground. When it…

A: The potential energy at the beginning of the fall is

Q: If you push a crate horizontally with 100N across a 10-m factory floor and the friction between the…

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Q: A 330g stone is raised to a height of 14m. the gravitational potential energy (in Joule) of the…

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Q: A weightlifter raises a 150-kg barbell from the floor to a height of 2.2 m in 0.80 s. What is his…

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.