An electrical motor provides 0.50W of mechanical power. How much time will it take motor to lift a 0.1 kg mass at constant speed form to a shelf 2.0 m above the floor?

a. 0.25s

b. 0.40s

c. 1.0s

d. 4.0s

The uniform 12 ft pole is hinged to the truck bed and released from the vertical position as the truck starts from rest with an acceleration of 3 ft/sec^2.

What is a plasma? A. A superheated liquid B. A solid in which the particles vibrate very quickly C. A gas in which the atoms have started to come apart D. A very hot liquid

Why does the temperature of melting ice not change even though is being transferred as heat to the ice? A. The potential energy of the molecules does not change. B. Energy is used to break bonds between molecules in ice. C.

List two characteristics used to classify air masses.

What is a Geographic test

If an electromagnet is used to pick up nails and other metal objects, what happens when the current is turned off?

An electron enters a region of uniform perpendicular en and bn fields. it is observed that thevelocity nv of the electron is unaffected. a possible explanation is:

Halley's comet orbits the sun roughly once every 76 years. It comes very close to the surface of the Sun on its closest approach. Estimate the greatest distance of the comet from the sun.

A 1.0 kg ball is thrown into the air with an initial velocity of 30 m/s. How much kinetic energy does the ball have?

Have scientists discovered a fifth fundamental force of nature?