Which discovery gave scientists the first evidence for the theory for the theory of plate tectonics

The tibia bone in the lower leg of an adult human will break if the compressive force on it exceeds about 4*105N (we assume that the ankle is pushing up). Suppose that someone step off a chair that is 0.40 m above the floor.

Tubes have a sides of equal lengths what is the fastest way to measure the volume of a cube shaped table

How long will it take the ball to reach a velocity of 15.0m/s?

Suppose a vacuum cleaner use 120 j of electrical energy. If 45 j are used to pull air into the vacuum cleaner, how efficient is the vacuum cleaner?

Two carts with masses of 4.52 kg and 2.42 kg move toward each other on a frictionless track with speeds of 5.08 m/s and 3.58 m/s respectively. The carts stick together after colliding head-on. Find the final speed.

You find out that it takes 2 sec. for the swing to complete one cycle. what is the swing's period and frequency?

Can you chemical change or alter DNA

Give an example in which velocity is zero yet acceleration is not.

A 2,537-kg truck moving at 14 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 8 m/s. What was the mass (in kg) of the struck car

Which of Newton's laws accounts for the following statement? "A force cannot act alone."