Given the following situation, which of the following statements are true? F F 0 AS 1. Energy is transferred out of the system. II. Energy is transferred into the system. III. The particle slows down. IV. Kinetic energy decreases. V. Speed is constant.
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- A horizontal carousel is rotating around its axis with constant angular velocity w. On the carousel there is a straight track passing through its middle. A cart of mass m is traveling along the track with constant velocity v relative to the carousel. Note that there is friction between the cart and the carousel. FR XRThe gravitational potential energy of a 500kg elevator at the top of a building, 450m above the ground level is O a. 0.225MJ O b. 2.205MJ O c. 2.205GJ O d. 2.205kJ1. An object I with a mass of 4 kg is lifted vertically 3 m from the ground level; another object II with a mass of 2 kg is lifted 6 m up. Which of the following statements is true?I. Object I has greater potential energy since it is heavierII. Object II has greater potential energy since it is lifted to a higher positionIII. Two objects have the same potential energy a. I b. II c. III d. I and II2. Which of the following device converts chemical energy in to electrical energy? a.. Loud Speaker b. Electric Motor c. Battery d. Solar panel letter only
- 2. You throw a 3 kg ball upwards: it goes up, turns around, and falls back down. At some point during its flight, it has a height of 2 meters, and a speed of 6 m/s. a. Calculate the total energy of the ball For each of the following heights in its flight, calculate the ball's gravitational energy, total energy, and its kinetic energy. Assume total energy is conserved for the ball. (Hint: you will need to use the total energy to figure out the kinetic energy) b. Height = 3 meters C. Height =1 meters d. Height =0 meters95. How much work is done (how much energy is required) to accelerate a 1987.5 kg car entering the highway from 40.875 mph (18.271125 m/s) to 67.15 mph (30.01605 m/s)? 56354.691 Previous submissions: 56354.7 J J incorrect
- 4-10 QUESTION 9 A mass m is dropped from a height h. As it falls the height decreases. What happens to the potential energy the mass had when it was at the height h; where does the potential energy go? Oa.It still has its original potential energy. Ob. The mass heats up. OC. The mass gains speed. Od. The mass loses speed. Oe. The mass gains potential energy.QUESTION 21 A block of mass 2.0 kg is moving to the right and changes its speed from 3.0 m/s to 1.0 m/s. Match the answers with questions. ✓ What is its initial kinetic energy? A. none of the given ✓ What is its final kinetic energy? B. 1.0 J ✓ What is the change in kinetic energy? C. 8.0 J D. -8.0 J E. 9.0 J F. -4.0 J G.4.0 J