Why matter has mass

How does heat conduction work

A pair of speakers on two sides of a stage are playing identical pure tones. When you stand in the center, equally distant from the two speakers, you hear the sound loud and clear.

Car A is traveling west at 60 mi/h and car B is traveling north at 40 mi/h. Both are headed for the intersection of the two roads. At what rate are the cars approaching each other when car A is 0.4 mi and car B is 0.3 mi from the intersection?

A person, with a mass of 50.0 kg, stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5.0 m/s 2 . What would be the reading on the scale? (A) 490 N (B) 250 N (C) 740 N (D) 240 N

Find the volume of a sphere which has 4 cm diameter

Identify each type of simple machine.

A car's speedometer reads 20 m/s after accelerating, from a standing start, for 25s. What was the magnitude of its acceleration?

What happens to the period of a pendulum and the period of a spring as the amplitude of the oscillation increases? Briefly give an explanation for this relationship.

The element that is most abundant in earth is

Your car travels 600 miles in 6 hours. You stop the car for lunch for 1 hour and then you continue on your trip for another 14 miles and finish the entire trip in 8 hours. What was your car's average speed while you were driving?