Why does increasing temperature increases vibration of molecules in conductors so it decreases it's conductivity while in semi-conductors it increases it's conductivity and no vibrations occurs in the molecules?!

The period of a 440 Hertz sound wave is __ seconds. 1/440 1/220 220 440

A rotating object starts from rest at t = 0 s and has a constant angular acceleration. At a time of t = 7.0 s the object has an angular velocity of ω = 15 rad/s. What is its angular velocity at a time of t = 14 s?

A billiard ball moving at 6.00 m/s strikes a stationary ball of the same mass. after the collision, the first ball moves at 5.39 m/s at an angle of 26.0° with respect to the original line of motion.

Brenda is standing on the beach; the sea is choppy. she observes that the crests of distant waves appear not only smaller, but also closer together than do the crests of waves nearer the beach. this example illustrates a depth cue known as:

Which of the following is the best example of kinetic energy? A book sitting on a bookshelf A golfer preparing to putt the ball A race car in position at the start line A satellite orbiting the Earth

In an experiment, all participants receive a treatment but those in the control group recieves a false treatments

When the volume increased, what happened to the density?

8. Chemical weathering occurs more rapidly in what kind of climates? A. Desertlike B. Cold with high snowfall amounts C. Cool and dry D. Warm with abundant rainfall

Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be A) zero. B) the same as before.

If an electromagnet is used to pick up nails and other metal objects, what happens when the current is turned off?