What universal standard is the basis of the atomic mass unit

Suppose that a person riding on the top of a freight car shines a searchlight beam in the direction in which the train is traveling. How does the speed of the light beam relative to the ground compare to the speed of beam when the train is at rest?

Explain the relationship between pitch and frequency.

Fredrick did an investigation on mass and acceleration. He applied a force to a toy car and measured the distance it moved. He then taped weights of different masses to the car and applied the same force. He entered his observations in a table.

A python can detect thermal radiation from objects that differ in temperature from their environment as long as the received intensity of thermal radiation is greater than 0.60 W/m2. Your body emits a good deal of thermal radiation.

What is a word or phrase that means the same thing as the law of conservation of energy

What must be true about tow objects if heat is flowing between them?

Will a 2 liter bottle of coke have a different density than a one liter bottle of coke?

A positive rod is placed to the left of sphere A, and the spheres are separated

Why do clothes often cling together after tumbling in a clothes dryer?

Can a blackhole be destroyed?