What is the key variable for calculating potential energy

A cannon recoils from launching a cannonball. The speed of recoil is small because the?

A car is travelling at 20 km/hr. It speeds upto 60 km/hr in 6 seconds. What is its acceleration?

A girl of mass 40kg jumps with a horizontal velocity of 5m/s on to a stationary cart with frictionless wheels. The mass of the cart is 10kg. The girl and the cart move off together in the same straight line.

A household fan draws 0.520 amps of current when the voltage is 120 V. How large is the resistance on the fan

The student stood at the bottom of the wall and then started to climb the wall. Explain how:

Ming drives across Arizona in the middle of July. She drives for two hours in the hot, desert sun before stopping for some snacks. Which statement describes the condition of the tires on Ming's car when she stops? A.

Why is it harder to get something moving than to keep it moving?

An advertisement for a new fish food claims that lab studies show that fish grew three inches in three weeks while eating the food. Travis wondered if the food was worth the extra cost. To evaluate the claim in the advertisement, Travis should

What will happen to an astronaut when the jets produce these four forces

What does it mean when the mark on the ramrod disappears into the barrel of the muzzleloader?