A mover brings a box up the stairs in 10 seconds. If he applied a force of 20 N over a distance 10 m on the box, calculate the power required for him to complete this action.

0.05 watts

201 watts

2,000 watts

20 watts

To recharge your cell phone you plug it into an electrical outlet for several hours. The electrical energy is stored as ___ energy until you are ready to use the phone. A. radiant B. thermal C. nuclear D. chemical

You throw a beanbag in the air and catch it 2.2s later at the same place you threw it. How high did it go? What was its initial velocity?

Nikolas had an idea that he could use the compressed carbon dioxide in a fire extinguisher to propel him on his skateboard. Nikolas, the fire extinguisher, and the skateboard have a combined mass of 50 kg.

If the real gi tract is 9 meters long, the model you created is what fraction of the real one

What force causes a wagon to speed up as it rolls down a hill?

Technician A says that engine parts should be be cleaned before a thorough test can be done to detect cracks. Technician B says that pressure testing can be used to find cracks in blocks or cylinder heads. Who is right?

How are mathematics and science related?

Radio telescopes detect waves with a wavelength of roughly 10 m. True False

2. A 0.30 kg ball is dropped onto a concrete driveway. The ball's velocity before impact is 4.5 m/s and after impact is 4.2 m/s. What is the change in the ball's momentum?

If we start with 400 atoms of a radioactive substance, how many would remain after one half-life? After 2 half-lives? After 3 half-lives? After 4 half-lives?