A man whose mass is 70 kg walks up to the third floor of a building. This is a vertical height of 12 meters above the street level, a) how many joules of work had he done? b) By how much has he increased his potential energy?, c) If he climbs the stairs in 20 seconds, what was his rate of working in hp?

Q: A constant horizontal pull of 9.50 N drags a box along a horizontal floor through a distance of 18…

A: Given data The horizontal pull is given as F = 9.50 N. The distance covered by the box is d = 18 m.…

Q: The roof of a large arena, with a weight of 480 kN, is lifted by 34 cm so that it can be centered.…

A:

Q: A piano mover rolls a 200 kg piano at constant speed up a ramp 2m long at an angle of 30 degrees…

A:

Q: I performed a lab using a toy car to go down a ramp that was positioned at different heights. For…

A: The work done by the force of gravity on car is calculated by the following equation. Here, m is…

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: Nellie Newton does work on a box by pushing it with a constant force of 100 N over a distance of 4…

A: Assume that Nellie Newton does a work by pushing a box with a constant force F = 100 N over a…

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: Water flows over a dam at a rate of 66,000 kilograms/second at a hydroelectric plant. a) How much…

A: We are given mass of water flowing over dam per second. We are also given the height through which…

Q: (a) What is the efficiency of an out-of-condition professor who does 2.10 x 105 J of useful work…

A: A) work = 2.1 × 105 J      Food Energy = 500×1000 cal                             = 21× 105 J  B)…

Q: 100 feet and weighing A chain, with length h 3 pounds per foot, hangs over the side of a building.…

A: Given:  Total length of the chain = 100 ft Weight of the chain = 3 pound per feet

Q: I performed a lab using a toy car to go down a ramp that was positioned at different heights. For…

A: Given data: The mass of the car is m=0.56 kg The height of the ramp is d=0.4 m Write the…

Q: A 4 kg crate sitting on a horizontal surface is pushed 30 m by a force of 6N applied at an angle of…

A: Given- Distance covered by crate (S) = 30 m Applied force (F) = 6 N Force appled at an angle (θ) =…

Q: A 4-kg object is slowly lifted 1.5 m. How much work is done against gravity? Repeat if the object is…

A: Given dat, Mass of the object = 4 kg Displacement = 1.5 m

Q: A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of…

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Q: Time yourself while running up a flight of steps, and compute the average rate at which you do work…

A: Suppose that, Total height of all the steps is h = 50 m Mass of the person is m = 60 kg Time taken…

Q: When a book slides along a tabletop, the force of friction does negative work on it. Can friction…

A: To explain: Whether friction can do positive work or not.

Q: (a) What is the efficiency of an out-of-condition professor who does 2.00 x 105 J of useful work…

A: