Time yourself while running up a flight of steps, and compute the average rate at which you do work against the force of gravity. Express your answer in watts and in horsepower.

Q: If it takes 4.00 J of work to stretch a Hooke's-law spring 5.0 cm from its unstressed length,…

A: The work done is given by  W = 12Kx2 where,  K is the spring constant and x is the stretch length.

Q: You and your bicycle have combined mass of 80 kg. When you reach the base of the bridge, you are…

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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: If a person of mass 100.0kg climbs a 2.00m high set of stairs in 4.00s, how much work do they do?

A: Given data: The mass of person is m=100 kg. Height of stairs is h=2.00 m. Time taken is t=4.00 s.

Q: .How much work is done in lifting a 2-kg ball 0.5m high? Express your answer in a) joules and b)…

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Q: A 25 kg sack of rice is lifted 1.25 m above the floor for 50 sec. The rate at which work is done on…

A: Given Data: mass (m) = 25 Kg Height (h) = 1.25 m Time (t) = 50 s

Q: Is it possible to increase the kinetic energy without the application of external force?

A: yes the kinetic energy will increase without applying any external force. for example, when we kept…

Q: If you pull a 9 kg mass vertically up 1.6 m at constant velocity, how much work do you do?

A: Given Mass= 9[kg] Height to which the mass is pulled up vertically= 1.6[m]  Work is said to be done…

Q: If a .770 kg ball is tied to a 1.5m string and swung in a vertical circle, what is the work done by…

A: Given:mass of ball (m) = 0.77 kg. length of string (l) = 1.5 m. displacement by string = 2l = 3 m.

Q: In physics, what conditions must be satisfied if work is to be done?

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Q: A record for stair climbing was achieved by a man who raced up the 1600 steps of the Empire State…

A: Given data from question,  Number of steps = 1600 Height = 320m Time taken = 10.2min Weight of man =…

Q: An apple weighing 1 N falls throughas a distance of 1 m. How much work is done on the apple by the…

A: weight of apple(W)= 1N Distance(d)=1m Work done=F.d=Fdcosθ F is force θ is angle between force and…

Q: How much work is done by a 59 kg ninja watrior in climbing a ladder that is 9 meters long? Express…

A: Mass of ninja warrior (m) = 59 kg  Length of ladder (L) = 9 m

Q: In the figure shown, if the mass (m=10 Kg) is moving with constant speed and traveled a distance…

A: Given mass = 10 kg  Moving with constant velocity i.e acceleration is zero  Distance traveled 13 m…

Q: Why do you do no work on a 25-kg backpack when you walk a horizontal distance of 100 mm?

A: When a person is carrying a backpack, the weight of the backpack is in the vertical direction. But…

Q: You attempt to lift a 1200 N barbell for 10 min, excreting a 1200 N force, but won't move. How much…

A: Required : Amount of work done.

Q: Say I lift a box from the ground straight up to 1m in 2s. If I lift the same box from the ground but…

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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: If you walk 2.0 m horizontally forward at a constant velocity carrying a 20-N object, what is the…

A: Given Data : The distance travelled horizontally is given as d = 2 m The weight of the object is…

Q: A force of 18 lb is required to hold a spring stretched 8 in. beyond its natural length. How much…

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Q: If a ski lift raises 100 passengers averaging 660 N in weight to a height of 150 m in 60.0 s, at…

A: Given information: Here, mg is the average weight of the passenger, h is the height attained by the…

Q: Why is it tiring to push hard against a solid wall even if no work is done? A 75 kg firefighter…

A: Q 1) We get tired because we use our energy to contract the muscles. We try to push the wall using…

Q: What would be the power output in hp of a 1750 kg car if it can ascend to the top of a 285 m high…

A: Take the bottom of the hill to be at height zero. The potential energy of the car at the bottom of…

Q: nat is the work done by a 2500 kg car whose velocity is 85 km/hr? und your answer to the nearest…

A: Given value--- mass = 2500 kg. final velocity = 85 km/h. We have to find--- work done

Q: Suppose a 51.5-kg woman does 50 deep knee bends in which her center of mass is lowered and raised…

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Q: Calculate the work you must do to accelerate 2 kg from 2 m/s to (2 + 1) m/s.

A: As per the given data,   mass(m)=2 kg;Initial velocity (u)=2 m/s;Final velocity (v)=2+1 m/s=3 m/s;

Q: If it requires 9.0 JJ of work to stretch a particular spring by 2.0 cmcm from its equilibrium…

A: Write the expression for the work done by the spring.

Q: Can positive work and negative work be done on an object at the same time?

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Q: Find the work done in joules by gravity as an object of the mass m=14 kg is raised up at constant…

A: Mass of object m = 14 kg Initial height h1 =34 m Final height h2 = 75 m g = 10 m/s²     Concept…

Q: A record was set for stair climbing when a man ran up the 2300 steps of the Empire State Building in…

A: Average power output is,

Q: A force of 17 Ib is required to hold a spring stretched 3 in. beyond its natural length. How much…

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Q: Is the work done by the applied force positive or negative when a heavy body is lowered to the…

A: Let h be the height at which the body is initially, F be the applied force, W be the work done by…

Q: What is the average power needed to move a 1000 kg car from rest in 7 seconds at a rate of 4 m/s^2?

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Q: In the figure shown, if the mass (m=6 Kg) is moving with constant speed and traveled a distance…

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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: Can the normal force on an object ever do work? Explain.

A: The work done on any object is given by W=Fd

Q: A 10 kg mass is held 1.0 m above a table for 25 s. How much work is done during  that time?

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Q: A new record for runningthe stairs of the Empire State Building was set on February 4, 2003.The 86…

A: The total height gained by the runner to run 1576 steps is:

Q: How much work can a 1950 Watt motor do in 15 min? Express your answer in Joules.

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Q: a weight lifter holds a 50kg weight a distance of 3m above the ground for 30 seconds.How much work…

A: Weight lifter makes an angle 900(perpendicular) with gravity, Work done (W) = Fd cos900…

Q: A 1.5 m high person is holding a 20 kg trunk on his head and is standing at a roadways bus-terminal.…

A: Work Done is calculated by the formula :   W = Force x Displacement                    ......(1)

Q: A bag of wheat weight 130 kg. To what height should it be raised so that potential energy is 150 J ?…

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Q: Why does one get tired when pushing against a stationary wall when no work is done on the wall?

A: Work done can be calculated as the product of the displacement and the force applied.