A65.0 kg ice-skater standing on frictionless ice throws a 0.15 kg snowball horizontally at a speed of 32.0 m/s. at what speed does the skater move backward?
a. 3.0 x 10-1 m/s
c. 7.4 x 10-2 m/s
b. -7.4 x 10-2 m/s
d. 4.9 x 10-1 m/s

On a cold day, when the air temperature is 0°c, you empty your lungs and take a deep breath, filling your lungs with 4.2 l of air. if you hold your breath until the temperature of the air in your lungs reaches 37°c, what is the volume of the air in your lungs at that point, assuming the pressure does not change?

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?