a. The work done on the block by the worker. b. The work done on the block by the friction force. C. The increase in potential energy for the block. d. The increase in kinetic energy for the block. e. The final velocity of the block, if it started from rest.
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- 11. How much work does Amanda's car experience compared to Bertha's? Amanda and Bertha are in a car race. Their cars have the same mass. At one point in the race, they both change their speeds by 10 m/s in 2 seconds. Ignore air friction. 2s later 2s later 10 m/s 20 m/s 20 m/s 30 m/s Amanda Bertha a. Amanda's car experiences less work b. Amanda's and Bertha's car experience the same amount of work c. Amanda's car experiences more work. O d. Only Rihanna would know. (Work Work Work Work Work...) 96 alt7. The force of an ideal spring is given by F = -k x Where k is the spring constant of the spring and x is the displacement of the spring from equilibrium. To stretch a certain spring 3.00 cm from its unstretched length, 12.0 J of work must be done. a. What is the force constant of this spring? b. What magnitude force is needed to stretch the spring 3.00 cm from its unstretched length? c. How much work must be done to compress this spring 4.00 cm from its unstretched length, and what force is needed to compress it this distance?1. An object with m = 2.6 kg is on top of a hill and is pressed against spring with k = 300 N/m. The spring is compressed by x = 0.55 m. The hill is 2.5 m high. The object is released and after the spring is decompressed it slides down the hill to the bottom. It does experience riction which does work of W = -92 J. At the bottom of the hill what is the object's kinetic nergy and what is its velocity? %3D %3D
- Two people stand on opposite sides of each other (one on the left and one on the right) pulling on a rope in a game of tug of war. The two people pull on the rope with equal and opposite forces. Which of the following is the expected out come for the work done to the system? No work is done on the rope since the rope has no displacement. Each player does equal amount of non-zero work. The rope moves to the right and the work is positive. The rope moves to the left and the work is negative.Starting from rest, a 6.2-kg block slides 3.2 m down a rough 37-degree incline. The coefficient of kinetic friction between the block and the incline is μk = 0.55. a) Determine the work done by the friction force between block and incline. b) Determine the work done by the normal force. c) Determine the net work done on the block.7. A force of 180 N stretches a spring 0.050 m beyond its unstretched length. a. What is the spring constant of this spring? b. What magnitude of force is needed to stretch the spring 0.012 m beyond its unstretched length? C. How much work must be done to stretch the spring 0.012 m beyond its unstretched length? d. What magnitude of force is needed to compress the spring 0.025 m? e. How much work must be done to compress the spring 0.025 m?