Isotopes are atoms with identical numbers of __ and different numbers of __.

protons; electrons

neutrons; protons

electrons; neutrons

protons; neutrons

What is the source of all waves?

An object with a mass of 2.3 kg has a force of 6.2 newtons applied to it. What is the resulting acceleration of the object?

A car travels 90 km/h. How long does it take for it to travel 400 km

g The index of refraction for water is about What happens as a beam of light travels from air into water? Its speed increases to, and its frequency decreases. Its speed decreases to, and its wavelength decreases by a factor of.

What is the property that is most similar among all elements across one whole period called?

How do we use light in space?

What units are used for gravitational potential energy? Write the name, not the symbol.

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa B. 73.5 Pa C. 226.5 Pa D. 122.5 Pa

A boulder of mass 2000 kg is at the top of a cliff of height 220 m. Determine how fast the boulder will be moving when it strikes the dirt below.

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.