Using a jack, a mechanic has a power output of 121 W to do 3138 J of work in order to lift a car vertically 0.5m. How long did this take

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?

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.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2