These show how something works that can't be seen

A young girl gives her toboggan a push of 4.0m/s uphill. It slides up the hill slowing down at an acceleration of 8.0m/s down. It comes to a stop and then slides back towards her speeding up at the same rate as it slowed down on the way up.

As the moon revolves around the earth, it also rotated on its axis why is that the same side of the moon is always visible from earth?

Air resistance is a type of friction true or false

If 320 J of work is done on a spring with a spring constant of 730 N/m, how far will it stretch? a 0.58 m b0.87 m c0.94m d0.61

Hydrogen is grouped with the alkali metals because it?

A grocery shopper tosses a (n) 9.1 kg bag of rice into a stationary 19.3 kg grocery cart. The bag hits the cart with a horizontal speed of 6.6 m/s toward the front of the cart. What is the final speed of the cart and bag? Answer in units of m/s.

Where do most metamorphic rocks processes take place?

A 13,500 kg railroad freight car travels on a level track at a speed of 4.5 m/s. It collided and coupled with a 25,000 kg second car, initially at rest and with brakes released. What is the speed of the two cars after collision

What type of waves move energy forward, but the source makes up and down

Why do helium balloons float? Talk about density of atoms and compare to elements in the air.