A 20-kg cart travels at 20 m/s in a circle with a radius of 20 m. What is the centripetal force?

20N

1N

400N

On a cold day (0 C) you observe a person far away from you hit a piece of metal with a hammer. Then 0.75 seconds later you hear the sound of the hammer hitting the metal. How far are you from the other person?

A 1kg pool ball travels to the right at 2m/s and hits another stopped pool ball bounces back to the left at 1m/s what is the velocity of the other pool ball

Fifteen identical particles have various speeds: one has a speed of 2.00 m/s, two have speeds of 3.00 m/s, three have speeds 5.00 m/s, four have speeds of 7.00 m/s, three have speeds of 9.00 m/s, and two have speeds of 12.0 m/s.

What is the energy (in joules) of an ultraviolet photon with wavelength 110 nm?

Humans are capable of vastly more complex thoughts and feelings due to the ever-adapting web of connection among?

Someone jumped from a high altitude at 31,000m above the earth. he freefalled for 4 min and 36 secs with top speed of 988 mph

What does the law of reflection mean?

Compared with the peak wavelength given off by the sun, what is the peak wavelength given off by a hotter star? A.) shorter in wavelength and higher in energy B.) shorter in wavelength and lower in energy C.

4. Explain the doppler effect. Be sure to talk about how the wave changes, the perceived change hear by a person that an emitted sound is moving towards, and the perceived change hear by a person that an emitted sound is moving away from. 5.

How do you calculate the effective resistance in a parallel circuit?