Which two types of waves can transmit energy through a vacuum?

1. radio waves

2. seismic waves

3. sound waves

4. water waves

5. x-rays

Two linear polarizing filters are placed one behind the other, so that their transmission directions are parallel to one another. A beam of unpolarized light of intensity?0 is directed at the two filters.

Three particles are fixed on an x axis Particle 1 of charge q1 is at x a and particle 2 of charge q2 is at x a If their net electrostatic force on particle 3 of charge Q is to be zero what must be the ratio q1 q2 when particle 3 is at x 0.

An atom gains an additional electron. What is the overall charge of the ion that is formed?

Suppose Galileo dropped a lead ball (100 kilograms) and a glass ball (1 kilogram) from the leading tower of pisa. Which one hit the ground first?

Explain the purpose of pumping while running through a half pipe

How many electrons are in the third energy level of a calcium atom

A child standing on a bus remains still when the bus is at rest. When the bus moves forward and then slows down, the child continues moving forward at the original speed. This is an example of

Where did Earth's water come from?, select the two competing scientific theories supported by evidence that explain the formation of the hydrosphere.

An apple in a tree has a gravitational store of 8J. As it falls, it accelerates constantly until it hits the ground. What is the apple's maximum kinetic energy store? Explain your answer.

Use the graph to determine the velocity of the object. What is the instantaneous velocity of the object at 3 seconds? m/s What is the average velocity of the object? m/s