A pulley system lifts a 500-lb. block 2.0 feet with an effort of only 50 lb. If the 50 lb. moves 30 feet, calculate the efficiency of the pulley system.

A 0.141 kg pinewood derby car is moving 1.33 m/s. What is its momentum?

Determine whether the given value is a statistic or a parameter. a homeowner measured the voltage supplied to his home on 20 days of a given monthon 20 days of a given month , and the average (mean) value is 112.3112.3 volts.

After going for a jog, Sean made himself a glass of ice water. He drank the water and then left the glass containing the ice on the counter. An hour later, he noticed that the ice had melted.

How do moving electric charges create magnetic fields?

What is the best explanation of work? A. Work occurs when a force acts on an object. B. Work occurs when force acts to hold an object in place. C. Work occurs when energy acts on an object. D.

An apple drops from a tree and hits the ground in 1.5s what is its speed just before it hits the ground?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?

A tow truck pulls a 500 kg car so that the car accelerates 2 m/s2. What is the net force on the car? 250 N 498 N 1000 N 502 N

Which force keeps you near earths surface?

Name one process that requires a force in the human body.