Tiffany leaves several balloons filled with helium gas inside her car on a sunny day. When she returns to her car, some of the balloons are much larger and a few have popped. Explain what happened.

if you held a stone over the mouth of a well and then let it go, what would happen to the stone? Explain your answer.

An ambulance is traveling north at 55.9 m/s, approaching a car that is also traveling north at 28.4 m/s. The ambulance driver hears his siren at a frequency of 983 Hz. The velocity of sound is 343 m/s.

When light hits a smooth, shiny surface, the light A) reflects. B) refracts. C) speeds up. D) diffracts.

How many btus of heat energy are needed to raise the temperature of 99.6 lbs of water from 50 °f to 130 °f?

For a line on a graph to represent an object increasing its speed, the line must show A) an increasingly steeper slope B) a negative slope C) a positive slope that is becoming more horizontal D) a positive slope

During practice, a baseball player hits a very high fly ball, and then runs in a straight line and catches it. Which had the greatest displacement during the time period from the hitting of the ball to its catching

Why are glass fibers stronger than bulk glass?

1. A 2000kg truck at rest accelerates to 45m/s in 7 seconds. What is its change in kinetic energy?

The speed with which force is developed by skeletal muscles is determined by the

What aviation first is paul maccready credited with