If a 10 kg weight is moved from a shelf 1m off the ground to a 3m off the ground, how much potential energy did it gain? 98 J
196 J
294 J
392 J

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?