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?!

A 0.10 kg piece of copper at an initial temperature of 95°c is dropped into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. the water and calorimeter are initially at 15°c.

Suppose that you toss a rock upward so that it rises and then falls back to the earth. If the acceleration due to gravity is 9.

A ball with a mass of 0.25 kg hits a gym ceiling with a force of 78.0 n. what happens next? a. the ball accelerates downward with a force of 80.5 n. b. the ball accelerates downward with a force of 78.0 n. c.

A particle of mass2.5kg moves in a cnservative force field. its potential energy curveis dhwn below. from the curve, detrmine (a) the totalmechanical energy curve particle at x=1.

A 2 kg laptop sits on the floor near a 4 kg jar of pennies. if the force of gravity between them is 3.42 * 10 ⁻¹⁰, how far apart are they?

What would happen to an object in orbit without gravity pulling down?

The waters of a lake will be most layered in which season A. winter B. spring C. summer D. fall

Which of the following is an example of an archery contestant showing good precision but poor accuracy? O A. Hitting a bulls-eye once and then missing a second time O B. Hitting a bulls-eye every time O C.

List and describe two ways currents affect life on earth

If a spring with a spring constant k = 10 N/m is stretched from its equilibrium position by 0.1 m, and released, what would be the maxi - mum kinetic energy at any time in its motion? Neglect friction. 1. 0.025 J 2. 0.1 J 3.