A 30-foot chain hangs over the side of a 50 foot tall building. The chain weighs 90 pounds. Set up, but do not evaluate an integral to find the work required to pull the entire chain up to the top of the building.
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- Little Hudson holds the 10-kgkg barbell 0.3 mm above the floor. What is the PE of the barbell relative to the floor? How much additional work will Hudson do when he lifts the barbell to a height 0.9 mm above the floor? If Hudson then drops the barbell, what will be its KE of impact with the floor?A 50 N force is applied at an angle to the side of a box causing it to slide across a floor. The total work done to move the box 10m is 150 J (joules). A) what is the angle at which the force was applied? B) if the box has a weight of 735 N, what is the mass of the box?A cable with length 17m has a mass of 34kg and is hanging off of the side of a building. Acceleration due to gravity is g = 9.8 m/s^2. Find the work done in winding up the cable. Round your answer to the nearest tenth if necessary.
- An elevator having a mass of 585 kg is raised a distance of 32 m. Determine the work done, neglecting frictional effects and the work required for acceleration.The 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 LYou are loading a refrigerator weighing 2.29×103 N onto a truck, using a wheeled cart. The refrigerator is raised 1.00 m to the truck bed when it is rolled up a ramp.Calculate the minimum work that must be done by the force you apply if the ramp is at an angle with the horizontal of 35.0°.Calculate the minimum work that must be done by the force you apply if the ramp is at an angle with the horizontal of 14.0°
- 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. magnitude X N direction |upwardA 3.8kg box is raised from rest a distance 8.4m by an upward applied force of 7.8N. Find the work done by gravity on the box. Give the numerical value only and include sign if applicable.