What is the average power required to raise a 1.20 x 10^4 newton elevator 8.0 meters in 21 seconds? 7.1 x 10^2 watts 4.57 x 10^3 watts 3.15 x 10^4 watts 2.01 x 10^6 watts

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

One number is said to be an "order of magnitude" larger than another number if choose one: a. it is 10 times larger. b. it is 5 times larger. c. it is 3 times larger. d. it is 100 times larger. e. it is 2 times larger.