What happens when an object is dropped? A. Its velocity at 2 seconds is 19.6 m/s. B. Its velocity at 2 seconds is 9.8 m/s. C. Its velocity at 2 seconds is 20 km/h. D. Its velocity at 2 seconds is 22 mph.

How can a vector have a component value equal to zero and also have a non zero magnitude

Two forces, 80 N and 100 N, acting at an angle of 60 ° with each other, pull on an object. (a) What single force would replace the two forces? (b) What single force (called the equilibrant) would balance the two forces? Solve algebraically.

What process do bats use to navigate? A. rarefaction B. echolocation C. polarization D. compression

On a tiny scale, what happens to an initially neutral object's mass when it gains a net positive charge through the exchange of electrons?

When U-235 splits, it usually emits a three neutrons. b no particles at all. c one neutron. d many electrons. e many protons.

A spring with a spring constant of 1200 N/m has a 55-g ball at its end. The energy of the system is 5.5J. What is the amplitude of vibration?

Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? a. W1 is zero, and W2 is positiveb. W1 = - W2c.

The amplitude of a sound is the Group of answer choices frequency of the sound. magnitude of displacement of a sound pressure wave. psychological aspect of sound related to timbre. amount of sound energy falling on a unit area.

Air at 38°C and 97% relative humidity is to be cooled to 18°C and fed into a plant area at a rate of 510 m/min. a. Calculate the rate (kg/min) at which water condenses. b.

a 7.26kg bowling ball (16 pounds) is at rest at the end of the bowling lane. : how long did you push the ball in this situation