A weight lifter raises a mass of 100 kg straight up a distance of 2 m at a constant speed. This lifting requires a time of 3 s. What average power is generated by the weight lifter during the lift?

(A) 50 w (B) 490 w (C) 653 w (D) 1960 w

For the same weight lifter as the previous problem, the amount of work done in lifting the weight is

(A) 50 J (B) 490 J (C) 800 J (D) 1960 J

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Examine the nuclear reacti why is this classified as a nuclear reaction rather than a chemical reaction? it is not balanced. a new compound is formed. a change has occurred in a nucleus. a new element has been formed.