A weightlifter can lift 220lbs. (assume 1kg weighs 2.2lbs) If he lifts the weight 2m above the floor, how much work did he do?

Follow up: if the weightlifter lifts the weight 1.2 seconds, how much power does he generate?

One example of a physical change is a. burning paper. b. baking cookies. c. the rusting of iron. d. mixing a milkshake.

Alcohol first reaches the area of the brain that controls

The rotating nozzle sprays a large circular area and turns with the constant angular rate theta overscript dot endscripts = 2.2 rad/s. particles of water move along the tube at the constant rate l overscript dot endscripts = 1.

Which factors control the cooling time of magma within the crust?

How many electrons can exist on the following energy levels

What force is responsible for your sensation of weight?

Science fiction movies that include explosion sound effects for battles in space are not scientifically correct. Why is this? A. The sound from an explosion can only be transmitted by air. B.

What is the kinetic energy of a 1,900 kg car moving at 89 km/h?

Why do we study black holes

Calculate the kinetic energy of a charging elephant if its mass is 5,000kg and it moves at 8m/s