A 23kg block at rest on a flat surface experiences 200 N of friction. What is the coefficient of friction for the surface

A classmate states that continental drift could not be possible because it would take far too much force to move tectonic plates. describe the hypotheses scientists use to explain the movement of tectonic plates.

What is the difference between speed and velocity? A) velocity describes speed with direction. B) there is no difference. C) Velocity describes direction with position. D) Velocity is used in space, while speed is used on earth.

Two 4.0kg masses are 1.0m apart on a frictionless table. Each has 1.0μC of charge. Part A What is the magnitude of the electric force on one of the masses? What is the initial acceleration of each mass if they are released and allowed to move?

If critical mass is reached, it can cause: A: electrons to split B: a chain reaction C: a fusion of uranium nuclei D: krypton atoms to split into strontium and xenon

Which statement correctly describes the relationship between frequency and wavelength? O As the frequency of a wave increases the longer its wavelength is. O As the frequency of a wave increases the shorter its wavelength is.

What countries will see the solar eclipse?

Water is a compound. O A. True B. False

How do air quality scientists ensure the air is cleaned? What steps do they take?

Is a mirrors surface opaque or transparent or translucent?

Sound waves can combine to become bigger or smaller true or false