What causes friction between two solid forces? After the roughness of the surfaces, what most affects the frictional force experienced

When light passes from one medium to another, resulting in a change in speed and direction of insolation,?

The acceleration due to gravity on Mars is less than that on Earth. On Mars, a person will weigh than on Earth.

A ball is released from the top of a hill. How fast is the ball going when it reaches the base of the hill? Approximate g as 10 m/s2 and round the answer to the nearest tenth.

A shout down a well produces an echo in 2.00 seconds. How deep is the surface of the water in the well? Assume the speed of sound to be 343 m/s.

What is the significance of the discovery of exoplanets?

Which of these circuit schematics has an ammeter?

What is the meaning of the word corrosion?

Which change occurs when an atom undergoes alpha decay?

the line on the position time graph show the velocites of different vehicles which line represents a vehicle moving at constant velocity

Cómo se visualizan las moléculas en la ciencia y por qué necesitamos una representación visual