The pitch of an ambulance siren changes as it approaches you. The pitch also changes as the siren moves away from you. Which is the scientific term for this occurrence?

What is the force required to lift the balloon with V=1500m3 and m=420kg, containing air with density 0.8kg/m3 and moving in air with density 1.3 kg/m3?

The force P is applied to the 59-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 198 N, and (c) P = 288 N.

For each group of terms, write a sentence that shows how the terms are related using position: time: motion

Mirrors light, prisms light

How many millimeters are there in one centimeter

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?