What provides the centripetal force needed to keep Earth in orbit?

A projectile proton with a speed of 1100 m/s collides elastically with a target proton initially at rest. The two protons then move along perpendicular paths, with the projectile path at 45° from the original direction.

Where on a bicycle do you want to reduce friction? How is this done?

Question 1 A boundary formed when two plates move past each other O A. Ocean A. Ocean basin B. Divergent boundary C. Transform boundary D. Convergent boundary

Which of the following statements are true about gravity? Check all that apply. A. Gravity exists between two or more objects that have mass. B. Gravity doesn't exist between the Earth and the sun. C. Gravity exists only on Earth. D.

A 3 kg bowling ball is thrown onto a mattress. If it takes 0.3 seconds to stop the ball using a force of 24 N, what was the initial velocity of the bowling ball when it first touched the mattress?

A sample of blood is placed in a centrifuge of radius 12.0 cm. The mass of a red blood cell is 3.0 ✕ 10^-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 ✕ 10^-11 N.

A guitar string produces 3 beats/s when sounded with a 352-hz tuning fork and 8 beats/s when sounded with a 357-hz tuning fork.

4. The amount of distance you need to stop the car increases with specu. A. true B. false

What are the three most abundant gases in the dry atmosphere?

What happens when you open a soda? Why?