What does it mean to say that a quantity is conserved

A string vibrates at a frequency of 20hz what is its period

A horizontal wire of length 0.53 m. carrying a current of 7.5 A. is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force.

A certain kind of glass has an index of refraction of 1.640 for blue light of wavelength 440 nm and an index of 1.595 for red light of wavelength 670 nm. If a beam containing these two colors is incident at an angle of 30.

Eating an orange enables a person to perform about 3.5x10^4 J of work. To what height does eating and orange enable a 55kg woman to climb?

Newton's First Law of Motion states that an object in motion tends to stay in motion unless it A starts to decelerate. B runs out of kinetic energy. с is acted upon by another force. D approaches the speed of light

The weight of an astronout is 60kg on earth, find the wight of the same object on the planet where the gravitational attraction has been reduced to 1/10 of the earths pull

Describe a situation in wich static friction is useful

What is the effect of the magnetic field on the protons? View Available Hint (s) What is the effect of the magnetic field on the protons? The protons are accelerated to the left, toward the S magnetic pole.

following statement supports which theory? "Astronomers have observed protoplanetary disks around distant newborn stars." Big Bang theory Nebular theory Cell theory String theory

For radio broadcast, sound signals are converted to a. ultraviolet waves. b. infrared waves. c. visible light waves. d. electromagnetic waves.