A crate slides down a ramp with friction in an open system. Which of the following statements must be true? a. Mechanical energy is being conserved. b. Gravitational potential energy is decreasing and kinetic energy is increasing c. Kinetic energy is decreasing. d. Kinetic energy is not changing, but gravitational potential energy is transforming to thermal energy e. None of the above must be true

Choose all the correct statement that applies to Work.   A. Work is the product of force and distance.   B. Work is a vector quantity.   C. Work is a scalar quantity.   D. work has magnitude only.

QUESTION 9 While moving a package up and down on a storage shelf the mover does +500 J of work and gravity does-500 J of work. Which statement is true about the Potential Energy and the Kinetic Energy of the package: A. The Potential Energy of the package is decreased. B. The Potential Energy of the package is increased. C. The Kinetic Energy of the package is increased. D. The Kinetic Energy of the package is decreased. E, The Potential Energy of the package does not change.

QUESTION 5 Which of the following statements about energy is not true? The mechanical energy of a physical system is constant when the forces acting on the system are all conservative forces. a. O b. According to the work-energy theorem, the forces that contribute to the net work include all the conservative and nonconservative forces. c. The total energy of the universe is always conserved. O d. Energy can change form, but it cannot be created or destroyed. O e. Mechanical energy is always conserved ONH

19. Using a rope, you pull a large 150 kg sled while accelerating at 0.2 m/s² across a horizontal (level) but icy surface. For a coefficient of kinetic friction between the sled an ice is 0.1. Calculate the total work when pulling the sled, a distance of 10 m. a. b. 30 Joules 300 Joules C. 1500 Joules d. 1800 Joules e. None of these are correct

A 25kg wagon is pulled by Bill with an applied force of 40N (29 degrees above the horizontal). The force of friction is constant 15N. If the wagon is pulled 15m. Calculate  a. The work done by Bill. b. The work done by friction c. The net work.

A car is traveling along a straight, level road when it slows down from 28 km/h to 14 km/h. The car's kinetic energy Group of answer choices a. does not change. b. decreases 2 times. c. increases 4 times. d. decreases 4 times.

A sprinter is practicing exiting the starting blocks with a large amount of power. What can the sprinter do to increase their power? A. Perform more work in the same amount of time B. Apply the same amount of work in a longer amount of time C. Perform the same amount of  work in a longer amount of time

7. John has 200 Joules of potential energy when he is standing on a diving board. a. Find his mechanical energy. b. John jumps off of the diving board. What is his potential energy when he is halfway to the water? C. What is his mechanical energy when he lands in the water?