4 An electric lightbulb operates for 1 hour and 15 minutes. What is the total time the
bulb operates in seconds? * m
(10 Points)
4.5x 10-1s
4.5 x 10-15
4.5× 10² s
4.5 x 10²5
4.5 x 10's

When an object moves in uniform circular motion, the direction of its acceleration is a) in the same direction as its velocity vector. b) in the opposite direction of its velocity vector c) is directed toward the center of its circular path. d) is directed away from the center of its circular path. e) depends on the speed of the object.

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.

Does heating a metal wire increase or decrease its electrical resistance? why?