Which is a good example of a contact force?

protons in the nucleus of an atom

a ball falling down after it's thrown up into the air

a satellite orbiting Earth

a bat hitting a ball

What is magnet and types of magnet

Alex want to test factors that affect the reaction rate of sugar in water

A railway wagon of mass 20t is moving along a level track at 10km/h when it collides and couples together with a second wagon of mass 25t moving in the same direction at 5km/h.

Quantum theory, where may the electrons of an atom be found

Two people carry identical 40.0 N boxes up a ramp. The ramp is 2.00 m long and rests on a platform that is 1.0 m high. One person walks up the ramp in 2.0 s and the other person walks up the ramp in 4.0 s.

As protostars continue to contract, their cores become hotter and more dense until what process begins ...

Emily jogs 3 laps at the track to warm up. She jogs at 5 mph. Then she runs 3 more laps at 7 mph. What is true about her average speed and her average velocity?

Which of the following elements are the most reactive? beryllium, calcium, magnesium, barium?

1.) State which definition of power below is correct. A.) the energy transferred per hour. B.) the energy transferred. C.) the energy transferred per second. D.) the force over a distance. 2.

Science and technology are closely related, but not the same. Which of the following is most likely a result of technology, not science?