Suppose the vertical height of stairs you walk up is reduced by half. How would this affect the work done and power required to climb the stairs? Assume you walk at the same pace in both situations. (Why does that matter?)

Q: A force of 3.0 pounds is needed to stretch the spring to 1.0 ft. from its natural length of 10…

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Q: How fast must be the 4.0 kg basketball thrown upward to achieve the same potential energy of 160 J?

A: Given: The mass of the object is 4 kg. The potential energy of the object is 160 J.

Q: In the figure shown, if the mass (m=5 Kg) is moving with constant speed and traveled a distance d=10…

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Q: A crane lifts a 650 kg beam vertically upward 9.6 m and then swings it westward 18 m. How much work…

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Q: Suppose the ski patrol lowers a rescue sled carrying an injured skiier, with a combined mass of 97.5…

A: Normal force on sled is mgcosθ Friction force: Substitute mgcosθ for  in above equation. Here; =…

Q: Suppose 65 passengers with an average mass of 75kg are transported by a ski lift to a height of…

A: Given: The number of passengers: n = 65. The average mass of a passenger: m = 75 kg. The height…

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: Calculate the work done by a 2.0-N force (directed at a 80° angle to the vertical) to move a 500…

A: Given data: Force (F) = 2.0 N Angle (θ) = 80°, with vertical Mass (m) = 500 gram Horizontal distance…

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: A 65-kg woman runs up a flight of stairs in 10.0 s. Her net upward displacement is 3.0 m.…

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Q: A crane lifts a 650 kg beam vertically upward 10.8 m and then swings it westward 18 m. How much work…

A: The formula for workdone is W=Fxcosθ

Q: Cite an example in which a force is exerted on an object without doing work on the object.

A: The work done will be zero when the applied force on an object is perpendicular to the displacement…

Q: A constant force of 40N in the positive x direction acts on a 4.0-kg object as it moves from the…

A: We are given that A constant Force of 40N  acting along positive x-axis acts on a 4.0kg object as it…

Q: Suppose that as part of their training, the football players of MSU went up a stair in 66 s. The…

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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: 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: As an object moves from point A to point B only two forces act on it: one force is nonconservative…

A: The work done by non-conservative is responsible for the mechanical energy of system. When work done…

Q: A mouse of mass 30.0 g falls 130 m down a vertical mine shaft and lands at the bottom with a speed…

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Q: A single force acts on a I kg panticle-like object in such a way that the position of the object as…

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Q: Calculate the work done by a 2.0-N force (directed at a 30° angle to the vertical) to move a 500…

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Q: A box of mass 20.0 [kg] slides down from the top of a surface inclined at 50.0◦ with height of 10.0…

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Q: How much work is done by the boy pulling his sister 30.0 m in a wagon as shown? Assume no friction…

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Q: A box of mass 25.0 [kg] slides down from the top of a surface inclined at 50.0◦ with height of 10.0…

A: Calculate the distance d moved by the box from the top to the bottom of the incline.…

Q: A 5.0-kg cart is moving horizontally at 4.0 m/s. In order to change its speed to 6.0 m/s, the net…

A: Given: Mass of cart m=5.0 kg Initial speed u=4.0 m/s Final speed v=6.0 m/s To find net work done in…

Q: Find the work done in joules by gravity as an object of the mass m=11 kg is raised up at constant…

A: Mass, m = 11 kg  Height, h1=29 m and h2=78 m  Acceleration, a = -g = -10

Q: A horizontal spring with a spring constant k = 126 kN/m is relaxed from an extension x = 9.3 cm back…

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Q: Calculate the total work done by the system from x = 1.40 m to x =4.80 m when force applied on the…

A: Given data : Force, Ft=5.00Nmx i^ + 7.00 Nm2x2 j^ + 9.00 Nm3x3 k^ Displacement x1=1.40 m…

Q: Calculate the average power necessary for a 55.8 kg person to run up a 5.0 m high, sloped hill, in…

A: The expression for the average power is P=Wt Here,P  is the average power,  iWs the work done by…

Q: How much work did the movers do (horizontally) pushing a 46.0-kg crate 10.6 m across a rough floor…

A: Given- Mass of crate (m) = 46 Kg Distance (d) = 10.6 m Coefficient of friction (μ) = 0.50

Q: car (m = 660.0 kg) accelerates uniformly from rest up an inclined road which rises uniformly, to a…

A: Given Mass of the car is m=660.0 kg Height of the hill is h=39.0 m Final speed of the car is vf=24.9…

Q: Suppose that 48 J of work is needed to stretch a spring from its natural length of 9 m to a length…

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Q: A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s.…

A: Given values: Mass, m=4.0 kg Initial speed, u=0 m/s Final speed, v=5 m/s

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: A force of 15 pounds, exerted at an angle of 50 degrees with the horizontal, is required to slide an…

A: The free-body diagram of the object is shown below. Here, F is the applied force.

Q: A person pulls a 75-kg box 20 m along a horizontal floor by a constant force Fp = 125 N, which acts…

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Q: Spiderman, whose mass is 80.0 kg, is dangling on the free end of a 12.0-m-long rope, the other end…

A: Mas, m = 80 kg  Length of rope, l = 12 m

Q: 11 3.0 m A 200 kg piano 3.0 m up a frictionless 200 incline at a constant speed? How much work is…

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Q: A man pushes an 46-N crate a distance of 62 m upward along a frictionless slope that makes an angle…

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Q: In the figure shown, if the mass (m=8 Kg) is moving with constant speed and traveled a distance d=18…

A: We know that work done  W = force ×displacement

Q: A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or…

A: Work is done whenever the given two conditions are satisfied: a force acts on the body. there is a…

Q: A crane lifts a 650 kg beam vertically upward 10.1 m and then swings it westward 18 m. How much work…

A: Here the workdone is only in upward direction. No workdone in horizontal direction.

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 box of mass 20.0 [kg] slides down from the top of a surface inclined at 50.0º with height of 10.0…

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