A gardener pushes a 16 kg lawnmower whose handle is tilted up 37∘ above horizontal. The lawnmower's coefficient of rolling friction is 0.22. How much power does the gardener have to supply to push the lawnmower at a constant speed of 1.1 m/s ? Assume his push is parallel to the handle.
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A gardener pushes a 16 kg lawnmower whose handle is tilted up 37∘ above horizontal. The lawnmower's coefficient of rolling friction is 0.22. How much power does the gardener have to supply to push the lawnmower at a constant speed of 1.1 m/s ? Assume his push is parallel to the handle.
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- You are giving your pet a ride in a wagon. You pull on the wagon handle with a force of 50.0 N directed at an angle of 40.0° above the horizontal. You pull the wagon this way in a straight line for 5.0 minutes and cover a distance of 450.0m. Describe three ways that you could increase your power output.A 2,200-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 4.60 m before coming into contact with the top of the beam, and it drives the beam 15.0 cm farther into the ground as it comes to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest. 588925.42 magnitude Write an expression for the work done by all of the forces acting on the beam as it moves into the ground and relate that work to the change in energy of the pile driver in order to find the force that the beam exerts on the pile driver. NA farmer is using a rope and pulley to lift a bucket of water from the bottom of a well that is hy = 9.5 m deep. The farmer uses a force F1 = 59.5 N to pull the bucket of water directly upwards. The total mass of the bucket of water is mb + mw = 3.1 kg. a.Calculate how much work Wf in J the farmer does on the bucket of water (via the rope) to raise it to ground level. b.Calculate how much work Wg in J gravity does on the bucket filled with water as the farmer lifts it up the well. c. Calculate the net work Wnet in J done on the bucket of water by the two forces F1 and Fg.
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- A 72.0 kgkg painter climbs a ladder that is 2.75 mm long leans against a vertical wall. The ladder makes a 30.0 ∘∘ angle with the wall. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Work done by several forces. 1. How much work does gravity do on the painter? Express your answer with the appropriate units. Wg= ____________ 2. Does the answer to part A depend on whether the painter climbs at constant speed or accelerates up the ladder? Yes / NoThe figure shows a ball with mass m = 0.499 kg attached to the end of a thin rod with length L = 0.308 m and negligible mass. The other end of the rod is pivoted so that the ball can move in a vertical circle. The rod is held horizontally as shown and then given enough of a downward push to cause the ball to swing down and around and just reach the vertically upward position, with zero speed there. How much work is done on the ball by the gravitational force from the initial point to (a) the lowest point, (b) the highest point, and (c) the point on the right level with the initial point? If the gravitational potential energy of the ball-Earth system is taken to be zero at the initial point, what is it when the ball reaches (d) the lowest point, (e) the highest point, and (f) the point on the right level with the initial point? (a) Number (b) Number i (c) Number (d) Number (e) Number (f) Number i Units Units Units Units Units Units LThe figure here shows an overhead view of three horizontal forces on a cargo canister that was initially stationary but that now moves across a frictionless floor. The force magnitudes are F₁ = 3.50 N, F₂ = 3.50 N, and F3 = 10.0 N, and the indicated angles are 0₂ = 48.0 deg and 03 = 30.0 deg. What is the net work done on the canister by the three forces during the first 4.20m of displacement? Show correct units. 1424 20 F