SI base unit used to measure the amount of a substance

Which scientist first discovered the white light is a mixture of a rainbow spectrum of light rays

Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth's mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. Show your work.

What is the definition of a "revolution"? user: which planet is closest to the sun? a. mercury b. venus c. mars d. jupiter

What does balanced and unbalanced forces have to do with newtons laws of motion

A crest in a transverse wave corresponds to a in a longitudinal wave

A planet is discovered orbiting around a star in the galaxy Andromeda at four times the distance from the star as Earth is from the Sun.

Measurements of how orbital speeds depend on distance from the center of our galaxy tell us that stars in the outskirts of the galaxy. True or False

Identify what is required to calculate the atomic number and atomic mass of an element

What device is used to measure the current in a circuit

A lever allows a 35 N load to be lifted with a force of 7 N. What is the mechanical advantage of the lever?