What is the frequency of an ultrasound that vibrates 30 000 times a second

Which scientist discovered the two radioactive elements radium and polonium?

A book falls off a 3 meter shelf. How fast will the book go?

What type of crime is committed when a hacker steals someones's bank accounts information

Explain the difference between rotation and revolution. Then use these terms to explain how earth

If the forces acting upon an object are balanced, then an object must a) be moving. b) be accelerating. c) be beginning to slow down. d) be moving at a constant velocity.

How to calculate kinetic energy? (physics/physical science)

What's the difference between the offspring of an asexual organism and a sexual organism

The contamination that results from the spread of bacteria from meat to vegetables is called

A rock has a mass of 5 kg on the moon. What is the mass of the rock on the earth

A battery applies 45 volts to a circuit, while an ammeter reads 10 ma. later, the ammeter reading drops to 7 ma. assuming the resistance has not changed, the voltage must have