What determines how many electrons will leave a piece of metal in the photoelectric effect

Which of the following theories states that the sun is the center of the universe? A) Heliocentric theory B) Ptolemaic system C) Geocentric theory D) Boyle's Law

Select all that apply. Select the items that describe an economy at equilibrium. A) Producers earn enough money to cover costs. B) Producers supply enough goods for consumers. C) Resources are not used efficiently. D) Supply equals demand.

If there is a 2kg ball and a 5kg ball with the same kinetic energy which one will be moving faster?

A stuntman drives a car with a mass of 1500 kg on a drawbridge. The car accelerates with a constant force of 10,000 N. While he is driving, the drawbridge is raised to an incline of 30°.

You push a cart with mass 20 kg forward, giving it an acceleration of 2 m/s2. How much force did you apply?

In general, what can be said about metals.

If the moon did not have an atmosphere what would happen to it

Density is calculated by: dividing volume by mass dividing mass by volume multiplying mass and volume multiplying mass and gravity

The Burj Khalifa in Dubai is the tallest building in the world at about 828 m. A daredevil climbs to the top of the building and sees the the Boulevard Plaza 2 (141 m tall) about 300 m away.

Suppose the initial position of an object is zero, the starting velocity is 3 m/s and the final velocity was 10 m/s. The object moves with constant acceleration. Which part of a velocity bs.