An ultrasound wave vibrates at 30,000 times a second state the frequency of the wave.

A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 51.1 kg and air resistance exerts a total upward force of 657 N on her and her parachute.

Why do atoms move at different speeds depending on weather they are in liquids or solids?

Which of the following does not accurately depict a scientific theory? A. Theories are tested over and over again. B. Theories are supported in many ways. C. Theories may be changed or replaced if new evidence is found. D.

If the light completed the 71.0-km round trip in the time it took the mirror to complete one-eighth of a revolution, what is the speed of light?

On a distant planet a freely falling object has an acceleration of 20m/s. what vertical distance will an object dropped from rest on this planet cover in 1.8

Which interaction of nature binds neutrons and protons into nuclei? A. strong B. weak C. electromagnetic D. gravitational

Why does icing sugar dissolve more rapidly than granular sugar?

At t = 0 the components of a radio-controlled car's velocity are vx = 0.5 m/s and vy = 1.2 m/s. Find the components of the car's velocity at t = 4.

2) A window washer pulls themselves upward using a bucket pulley apparatus. A) How hard must pull downward to raise herself slowly at a constant speed? B) If she increases this force by 15%, what will her acceleration be?

A star with an original mass of 8 to 25 solar masses will ultimately become a? a) red giant b) white dwarf c) neutron star d) main sequence star