Which of the following best describes force?

A. A push or pull

B. Speeding up

C. Moving an object

D. Slowing down

When is momentum conserved? A. it is conserved when only two objects collide; more than two objects can't conserve momentum. B. it is always conserved. C.

Assuming that the bohr model is valid, what is the kinetic energy of a photoelectron liberated by a photon with a the given wavelength from a state with given z and n

If a car rolls gently off a vertical cliff, how long does it take to reach 90km/hr.

Explain why the person heard the thunder after seeing the lightning

In terms of substances explain why evaporation of water is a physical change and not a chemical change

How does an increase in thermal energy affect molecules?

Which of the following is an example of applied research?

A Cadillac Escalade has a mass of 2,569.6 kg, if it accelerates at 4.65 m/s^2 what is the net force on the car?

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is the average speed of the car? a.) 180 km/h b.) 100 km/h c.) 90 km/h d.) 120 km/h