What is a system?

A. A definite quantity of matter enclosed by a boundary

B. A definite quantity that does no work

C. A definite quantity that contains all energy

D. A definite quantity that allows no heat to flow

What does it mean to say the momentum is conserved?

An object changed its velocity by 19m/s over a time of 3s. What was its rate of acceleration

A stone is thrown horizontally at a velocity of 12.90 m/s from a tree house that is located 73.2 m above the ground in a beautiful redwood tree. What is the stone's horizontal component of velocity just before it hits the ground?

A joule, which is a unit of work, is equal to? A. a newton times a meter B. a newton divided by a second C. a newton times a second D. a newton divided by a meter

Laura is skydiving when at a certain altitude she opens her parachute and s toward the ground with a constant velocity of 6.50 m/s, straight down. What is Laura's displacement if it takes her 34.0 s to reach the ground?

A car's position in relation to time is plotted on the graph. What is the car's average velocity for segment C? A) - 4 m/s B) - 0.25 m/s C) 0.25 m/s D) 4 m/s

What percent of my Iodine-131 sample will be left after 7 half-lives?

A 58.0 kg snow skier is on the top of 351 m high hill. After she has gone down a vertical distance of 142 m, what is her mechanical energy? Explain your answer (CER) !

A sphere has a mass of 2.10kg and travels along a horizontal plane at the velocity of 12.2m/s. Find the energy

What is the force required to accelerate a baseball with a mass of 0.145 kilograms and an acceleration of 35.00 meters/second squared?