A string exerts a tension force of 55 N on a 10-kg block as it moves a distance of 5 m up a frictionless incline, as shown. The string pulls parallel to the incline. 55 N 10 kg 5m a) Find the total external work done on the block-earth system as the block moves 5 m up the incline. b) Find the change in gravitational potential energy for the block-earth system as the block moves 5 m up the incline. ) Find the change in kinetic energy for the block-earth system as the block moves 5 m up the incline. e=37

Energy (1).pdf 2 / 3 T Problem 9: A 3 kg block is pushed 3 m up a 30° incline by a 50 N force aligned parallel to the ramp. The coefficient of kinetic friction between the ramp and the block is 0.2. a) Calculate the work done by gravity. b) Calculate the work done by the applied force. c) Calculate the work done by the normal force. d) Calculate the work done by the friction force. e) Calculate the net work done on the block. f) Find the speed of the block after traveling this distance. Assume it started at rest. 110% Pr TI re W sp ha A: ar ax Pr A pe of re

1480 kg car accelerates uniformly from a position of rest to a speed of 95 km/h in 6.0 s. a) Calculate the car's acceleration. b) How far did the car travel during this acceleration?  b) How much work was done by the car during this 6.0 s?

When a roller coaster is at the top of a steep hill, its potential energy is maximum. When it hurdles down the slope and comes to the bottom, the potential energy reduces greatly. Hence we can say that the law of conservation of energy is not valid here since energy is destroyed. a) True b) False

10 kg 0=37° 55 N 5 m **22. A string exerts a tension force of 55 N on a 10-kg block as it moves a distance of 5 m up a frictionless incline, as shown. The string pulls parallel to the incline. asmisioa) a) Find the total external work done on the block-earth system as the block moves 5 m up the incline. b) Find the change in gravitational potential energy for the block-earth system as the block moves 5 m up the incline. ga c) Find the change in kinetic energy for the block-earth system as the block moves 5 m up the incline.

- A person lowering a 50 N block over 0.8 m. Determine the work done by the string on the block as the block is lowered 0.80 m. The string tension is 50 N. : A person is pulling a 50 N block up a 60 deg. incline over 0.8 m. Determine the work done by the string on the block as the block is lifted 0.80 m along the incline. The string tension is 50 N.