A20-kg barrel is rolled up a 20-m ramp to the back of a truck whose floor is 5.0 m above the ground. what work is done in loading one barrel into the truck? a: 980j b: 19,600j c : 4900j d : imposible to tell because velocity is not given.,

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit

Which magnetic property best describes a magnet’s ability to act at a distance? magnets are dipolar. magnets attract only certain objects. magnets have magnetic fields. magnets can transfer their properties to certain materials.