Which best describes a reference frame?

A. a distance over which an object moves

B. the difference between start and end velocity

C. a position from which something is observed

D. the average speed of a group of objects

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. She placed a ray box in front of a mirror.

Which of the following is not a common property of waves? a. wavelength b. frequency c. mass d. period

An elevator weighing 6,000 N moves up a distance of 10.0 meters in 30.0 seconds. a. How much work did the elevator's motor do? b. What was the power of the elevator's motor in watt and in horsepower?

A 5.5 kg box is pushed across the lunch table. the net force applied to box is 9.7 N. what is the acceleration of the box?

While standing on a sidewalk on a quiet day, you hear a tuning fork, held by a friend, produce a pure 440 Hz sound tone. When your friend sees you, she begins to ride her bike toward you. When she passes by you, she does not stop.

Which statement describes how light behaves when it strikes a translucent material? A. Light is scattered. B. Light is transmitted. C. Light is reflected. D. Light is absorbed.

A certain gas is present in a 15.0 l cylinder at 2.0 atm pressure. if the pressure is increased to 4.0 atm the volume of the gas decreases to 7.5 l.

Choose all the answers that apply. To qualify as a planet, a celestial object must: have an irregular shape revolve around the sun orbit in a clear area have enough gravity to have a spherical shape have a satellite

Oxygen makes up the largest part of living cells at 65%. What is the percentage of the second-most abundant element in living cells?

Acceleration is defined as the rate of change for which of the following? A. time B. velocity C. position D. displacement