Which are descriptions of gravity on Earth? Check all that apply.

an attractive force

a repulsive force

a noncontact force

a contact force

a horizontal force

a vertical force

In order to increase the amount of work done, we need to: A. decrease the force applied to an object. B. decrease the time to do the work. C. increase the time to do the work. D. increase the force applied to the object.

A uniform drawbridge must be held at a 37 ∘ angle above the horizontal to allow ships to pass underneath. the drawbridge weighs 45,000 n and is 14.0 m long. a cable is connected 3.

What happens to the velocity of an object when balanced forces act on it? a. There will be no change c. There will be negative acceleration b. There will be positive acceleration d. Velocity will change, but not acceleration

Earthquakes occur on the earth today, so we can assume they occurred in the past. Which important geologic principle does this sentence support? A. superposition B. original horizontality C. uniformitarianism D. faunal succession

A fuel pump sends gasoline from a car's fuel tank to the engine at a rate of 5.94 10-2 kg/s. The density of the gasoline is 735 kg/m3, and the radius of the fuel line is 3.10 10-3 m.

An arrow is shot upward on mars from ground level with a velocity of 60 meters per second. Its height (in meters) after t seconds is given by 2 s (t) = 60t - 1.9t^2.

What are (a) the lowest frequency, (b) the second lowest frequency, (c) the third lowest frequency of transverse vibrations on a wire that is 10.0m long, has a mass of 100g, and is stretched under tension of 250 N?

Why is a rock salt crystal likely to shatter when struck

Find the speed required to throw a ball straight up and have it return 6 seconds later. neglect air resistance. how high does the ball go?

Do all electromagnetic waves travel at the speed of light, carry energy, and travel through a vacuum?