Define light yearend explain how and why light years are used to measure distances in the universe

The population mean on a statistics exam is 72, with a standard deviation of 12. The population average on the class project is 95, with a standard deviation of 4.

A star is held together by:

If I were to transmit a radio wave in our three dimensional world could a fourth dimensional "being" be able to receive it?

A 92-kg astronaut and a 2000-kg satellite are at rest relative to a space station. the astronaut pushes on the satellite, giving it a speed of 0.14 m/s directly away from the station.

Name at least one benefit for each type of scientific investigation.

When a bar magnet is broken into two pieces each piece has a north and south pole because a the magnetic fields reversed b every magnet is made of many aligned smaller magnets с bar magnets are permanent magnets d the magnetic poles have been

A box is being pulled to the right. What is the direction of the gravitational force?

An electron, starting from rest and moving with a constant acceleration, travels 2.0 cm in 5.0 ms. What is the magnitude of this acceleration?

Which equation correctly relates kinetic energy, mass, and velocity? Which of the following is an example of kinetic energy?

2. An 800-g bird has 47.0 J of gravitational potential energy when it is perched high up in a tree. Calculate the bird's vertical height from the ground.