A clear echo is heard within 0.2 seconds when a person shouts by sitting at the ridge of a hill. Calculate the velocity of sound in air. The distance between the person and the hill is 33.2 m

Four students measured the acceleration of gravity. The accepted value for their location is 9.78 m/s2. Which student's measurement has the largest percent error?

In A boat race, Dan drove his motorboat over the 1000-meter course from start to finish in 40 seconds. What was Dan's average speed during the race?

During the final stages of descent, asky diver with an openparachute approaches the ground with a constant velocity. Thewind does not blowhim from side to side.

A motorcycle is traveling along a highway at 26 m/s. How far does the motorcycle travel in 15 s?

The rule of mixtures is used for which of the following purposes related to composite materials (one best answer): (a) calculating the proportions of each material to include in the composite material, (b) calculating the strength of a

Which is a result of using a machine? The amount of work that is done is increased. The work input is less than the work output. Both the force and the distance through which it acts increase.

What is the difference between electromagnet and electromagnetism?

Which of the following can be determined by studying the spectrum of a star? the chemicals in the atmosphere of the star the motion of the star the temperature of the atmosphere of the star all of the above

How do I find the specific heat of an object?

In order to be considered scientific, evidence must be: