Which of the following must be happening if an object is in uniform circular motion?
O A. The object must be moving in a straight line.
O B. The object's velocity must be changing.
O C. The object's speed must be changing,
O D. The object's centripetal acceleration must be changing,

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.