Simon is riding a bike at 12 km/h away from his friend Kesha. He throws a ball at 5 km/h back to Keesha who is standing still on a sidewalk. How fast you would Kesha say the ball is traveling?

Two sound waves of equal amplitude interfere so that the compression of one wave falls on the rarefaction of the other. Which statement is true? A. No sound is heard. B. The loudness of the sound increases. C. There is no change in the sound. D.

Pollution is a problem associated with urban sprawl, but not with upward growth.

Where is the electricity used at home generated? how dose it reach our house

After your school's team wins the regional championship, students go to the dorm roof and start setting off fireworks rockets. The rockets explode high in the air and the sound travels out uniformly in all directions. If the sound intensity is 2.

Which lists the outer planets in order from furthest to closest to the Sun? Neptune, Uranus, Saturn, Jupiter Neptune, Saturn, Uranus Jupiter Jupiter, Saturn, Uranus, Neptune Jupiter, Neptune, Saturn, Uranus

A car accelerates uniformly from 0 to 15m/s in 5 s. Calculate acceleration.

Which device would a sleep researcher use to monitor a sleeping person's brain waves?

An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is:

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.

What two factors determine how fast weathering occurs