How much heat is needed to warm 0.052 kg of gold from 30 C to 120 C?

The functioning of an electron transport chain is analogous to a) a slinky toy going down a flight of stairs. b) a canoe going over a waterfall. c) a person climbing a flight of stairs one step at a time. d) a person leaping from the top to the bottom of a flight of stairs in one jump.

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

Abearing is designed to a reduce friction b. support a load c.guide moving parts such as wheels, shafts and pivots d. all of the above