Two substances were mixed and there was a color change and small flames. What can you infer happened?

A physical property was observed

A chemical change occurred

A change in state from solid to liquid

Matter was destroyed

Who invented the electric scoreboard

The velocity a car traveling north decreases from 20 m/s to 12 m/s in 32 seconds. What is the acceleration of the car?

If the out come of a 1.0-kg ball moving at 3.0 m/s is 4.5 kinetic energy what would the kinetic energy be if the mass and speed doubled

A force F of magnitude 2x^3 is applied to stop a particle moving with an initial velocity of v0. The particle travels from x=0 to x = D in coming to a stop after the force F is applied.

What do wind turbines, hydroelectric dams, and ethanol plants have in common? A. All produce electrical current with pollution B. All use generators to produce electrical current C. All convert gravitational potential energy to electrical current D.

For a stationary observer, when the source of a sound is moving, its pitch appears to change.

Give an example of each simple machine

The product PV, where P and V represent pressure and volume respectively, is a unit for which? A entropy B force C impulse D work

IF it possible for an object to move for 10 seconds at a high speed and end up with an average velocity of zero? true or false

The boy moving down the hill posses what energy?