Why is a living thing a system?

Billy goes ice skating with his friend Sally. While they are both standing on the ice before skating Billy pushes Sally. What is Billy's (m = 55 kg) velocity after he pushes Sally if Sally has a mass of 45 kg and moves off at 2.5 m/s?

An ultrasound beam is incident on liver tissue at an angle of 50 degrees. This beam undergoes refraction at the interface between the fluid above and the liver.

suppose you had two small boxes, each containing 1.0 g of protons. (a) If one were placed on the moon by an astronaut and the other were left on the earth, and if they were connected by a very light (and very long!

Describe what would happen if Earth's magnetic field continues to lose strength

You have a sealed glass jar full of air. If you put it in the freezer, what happens to the gas pressure in the jar?

Which location would allow the least amount of water to be absorbed into the ground? 1) A grassy terrain 2) A sandy beach 3) A Forest 4) A mountain

C 2000 pascals D. 200pascals 11. Which of the following is a second class lever? A Crowbar B. secateurs c. bottle opener D. tongs Workdone is - A force/distance B. force x distance C. force divided by di

What happens to the Total Energy as the spring bounce?

IF you are skateboarding and push back with one leg, and, as a result the skateboard moves forward. Which law of motion is being described

Explain why astronomers long ago believed that space must be filled with some kind of substance (the "aether") instead of the vacuum we know it is today.