Why does the force of gravity does no work on a car that rolls down a hill but no work when it rolls along a level part of the road?

Q: Lifing a weight to a height of 20 m takes 20 s for one crane and 10 s for another. Is there any…

A: The expression for work done (W) is given as: W=w×h Here, w is the weight, and h is the height.

Q: It takes a force of 35 N to stretch a 45-cm spring to 90 cm and hold it there. How much work was…

A: Given The force to stretch the spring is F=35 N. The initial length of spring is xi=45 cm. The…

Q: Calculate the work done when a force of 5 N moves a book 1.2 m. (Remember that 1 N?m 5 1 J.)

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

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Q: At a playground, a 22 kg child plays on a slide that drops through a height of 2.3 m . The child…

A: From conservation of energy , the change in mechanical energy is equal to the non-conservative work…

Q: Does the work you do on a book when you lift it onto a shelf depend on the path taken? On the time…

A: Work done

Q: Tala fills a basket with shopping weighing 12 kgs. How much work is being done on the shopping…

A: Tala fills a basket with shopping weighing 12 kgs. How much work is being done on the shopping…

Q: At a playground, a 19-kg child plays on a slide that drops through a height of 2.3 m. The child…

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Q: The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.

A: Write the expression for the work done.

Q: The work you do when pushing a shopping cart twice as far while applying the same force is A) half…

A: Given data:  New displacement (d') = 2d New force (F') = F Required: New work done

Q: How much work is done lifting a 2.3 N hamburger a vertical distance of 0.30 meters from the table to…

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Q: why is the maximum work a force can do on an object occur when the force is in the same direction of…

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Q: Why is it that the work done in holding a bag w above the floor is 0?

A: GivenF=1 N1 m above the floor

Q: What is the difference between work and energy?

A: Introduction: Work is the transferring of some amount of energy with the help of force.

Q: 11. A child pulls a 7.4-kg toboggan 4.2 m across level ground with a 15-N force that is 34° above…

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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 60 kg woman whose average power is 30 W can climb a mountain 2.0 km high in

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Q: Show that 2.4 J of work is done when a force of 2.0 N moves a book 1.2 m.

A: Work done = Force x Distance moved by the force = Fd W = 2.0 N x 1.2 m W = 2.4 N.m = 2.4 J

Q: How much work is required to throw a ball with a mass of 0.46 kg 33.1 m/s? Assume the ball starts at…

A: Given Mass of ball = 0.46 kg Initial velocity of ball = 0 m/s Final velocity of ball = 33.1 m/s We…

Q: Ahmed carrying a weight of 50 N walks a distance of 2m as shown in figure. The work done by him is…

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Q: presses a spring from its natural length of 18 cm to a length of 16 cm. How much work is done in…

A: GivenA force, F= 1200 N compresses a spring from its natural length of 18 cm to a length of 16 cm

Q: A ball of 0.1 kg is dropped from rest. When it falls through a distance of 2 m, the work done by the…

A: The expression for work done is, W=F×d                                    F=force,d=dispalcement…

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: If your friend pushes a lawnmower 4 times as far as you do while exerting only half the force, which…

A: The work is force times distance. Your friend uses a half of the force but goes four times as far.…

Q: A ball was launched upwards and vertically at a speed 3 m/s up to a height 4 m. What the work done…

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Q: Give 5 situations in which work is not done on it.

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Q: . Is it possible to do work on an object that remains at rest?

A: Work

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

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Q: How can we ignore the self-potential energy when doing a work-energy problem or an…

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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: If 2.0 J of work is done in raising a 0.180 kg apple, how far is it lifted? (Remember: F = mg)

A: Given  Work done W=2J Mass of apple m=0.18kJ

Q: If you pushed a cart for 3.34 meters along an incline of angle 11.51 by applying a force of 29.67…

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Q: How much work does a sled dog do if she pulls with a force of 55 N on a horizontal track over a…

A: Here, Force and displacement are in the same direction, Therefore, Work done= Force x Distance…

Q: If an object of mass 2 kg is thrown up from the ground reaches a height of 5 m and falls back to the…

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Q: How much work is required to lift at 3.10 KG object from the bottom of a well 11.1 M deep?

A: Let h denotes the depth of the well, m denotes the object’s mass, U denotes the potential energy of…

Q: Ahmed carrying a weight of 50 N walks a distance of 2m as shown in figure. The work done by him is

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Q: 8.1. What is the work done by a force of 20 N acting through a parallel distance of 8 m? What force…

A: The work done by a force is   W=Fd      =(20 N)(8 m)=160 J

Q: A force of F = 186 N pulls a mass of 15 kg a distance of x = 2.4 m, as shown. How much work is done…

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Q: A box with a mass 2.0 kg that initially slides on the floor with a speed of 5.0 m/s is accelerated…

A: Mass of box, m = 2 kg  Initial velocity, u = 5 m/s Acceleration, a = 4 m/s2  Time, t = 10 s We have…

Q: A force of F = 161 N pulls a mass of 15 kg a distance of x = 5.7 m, as shown. How much work is done…

A: Given,            force (f) =161N            distance (d) = 5.7 m

Q: How much work does gravity do on a 0.150 kg ball falling from a height of 10 m? (Neglect air…

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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.