Are the following physical or chemical changes?

1. Weathering:

2. Deposition:

3. Metamorphism:

4. Melting:

Jamie begins her journey at 15 km and ends her journey at 75 km. She travels for a total of 3 h. What is her velocity?

A wagon weighing 1800 newtons is pulled by a horse at a speed of 0.40 m/sec. what is the power of this horse?

Because not all stars are the same distance from the earth, it can be difficult to determine

Why do astronauts' weights differ in space? There is a less gravitational force in space. Their mass changes in space. Space is colder than Earth. There is less oxygen in space.

A boy standing on the deck of a bridge sees a motorboat approaching in the water below at a constant rate of speed. When the boat is 27 meters from the bridge, the big drops a stone to the water below. If the stone strikes the water 3.

Your grandfather clock's pendulum has a length of 0.9930 m. if the clock loses 60 seconds per day, should you increase or decrease the length of the pendulum?

A car crash causes an acceleration of 6.2 g. What is the car's acceleration in meters per second squared?

Suppose you read in the newspaper that a new planet has been found. Its average speed in its orbit is 33 kilometers per second (km/s). When it is closest to its star, it moves at 31 km/s, and when it is farthest from its star, it moves at 35 km/s.

What happens when light from a flashlight strikes Water droplets from a mist of water

What is the length of a box in which the minimum energy of an electron is 1.5*10^-18 J?