John traveled on a motorbike a distance of 1,500 meters north to get to the nearest shopping center. He then turned back south and rode another 1,450 meters to meet his friend. What was his displacement?

What must exist for electric charges to flow? electric potential or electric potential difference

It takes Venus 225 days to orbit the sun. If the Earth-sun distance is 1.5 * 10^11 m, what is the mean distance between Venus and the Sun?

A lacrosse ball that is thrown straight upwards reaches a maximum height of 4.5 m. At what initial velocity was it thrown? (note: final velocity, v = 0, at the top).

Which of the following statements is true? Protons are located outside the nucleus of an atom. Electrons do not have mass. Individual atoms can be seen with the naked eye. The nucleus of an atom contains protons and neutrons.

Which substance is made of molecules? a. water b. table salt c. aluminum foil d. pure gold necklace

Which best describes the differences between how Ptolemy and Copernicus described the solar system? A. Ptolemy saw the sun at the center of the solar system, while Copernicus saw the earth as the center. B.

A man is standing on the shore of a beach, up to his knees in water. Every 5 seconds a wave breaks on him. What is the period of the wave? A. 12 waves per minute B. 5 hertz C. 5 seconds D. 0.2 hertz

A beam of light with a wavelength 760 nm in air travels in water. The index of refraction of water is 1.33. What is the wavelength in water?

45. An object with a mass of 25 kg accelerates east at a rate of 7 m/s? What fiet force is acting on the object?

The speedometer in your car reads 55mi/h this represents ___ of the car