What does the law of conservation of energy state about energy in a closed system?

1 Calculate the size of the quantum involved in the excitation of (a) an electronic motion of frequency 1.0 * 1015 Hz, (b) a molecular vibration of period 20 fs, and (c) a pendulum of period 0.50 s.

a new high speed rail system uses 6000 horsepower electric cars which get their power from 25 kV overhead wire with resistance 15 ohm. current returns through the track, whose resistance is negligble. what is the maximum range of the train

True or false The sound of a police siren would be an example of the Doppler effect

The moon's average density is about 3.34 grams per cubic centimeter. what is this density in units of pounds per cubic inch?

A toy car engine pushes it forward at a constant speed. what happens if the force provided by the engine decreases? A. the toy car speed remains constant B. the toy car mass mass increases C. the toy car gains inertia D.

Which describes a property shared by ultraviolet light and X-rays? A They are both transverse waves. B They share the same wavelength. C They contain less energy than visible light. D They both require a medium to travel through.

What is the potential energy called that is associated with objects that can be stretched

Which of the following is not a current use of radioisotopes? medical diagnosis sterilization of equipment detection of leaks in building structures light fixtures

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a