In a perfect vacuum, light waves travel at 300,000 kilometers every second. When light waves travel through materials, such as air, they

A. speed up

B. slow down

C. increase in amplitude

D. Heat up

The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 10 m radius of curvature. What is the car's speed at the bottom of the dip?

What's period formula

What is the speed of a bobsled whose whose distance time graph indicates that it traveled 113 m in 30 s

A ball rolls with a speed of 4.0 m/s across a level table that is 1.0 m above the floor. Upon reaching the edge of the table, it follows a parabolic path to the floor. How many meters along the floor is the landing spot from the table?

A 5 kg block is being pulled to the right by a rope tied to it. The block is accelerating at 2 m/s2 to the right. How much force is being applied? Use the formula F = m x a Select one: a. 3.5 N b. 3 N c. 7 N d. 10 N

Which defintion of heat is most scientifically accurate

What is the name of the effect that causes water to travel at an angle to trade winds?

Two books with different masses fall off the same bookshelf. As they fall, which has more kinetic energy and why

Which of the following is an example of convection? a a hot object transferring heat to a cooler one b the rays of the Sun warming the earth c a hot oven warming the air around it d hot air rising and cooler air falling

Bob drove from home to work at 60 mph. after work the traffic was? heavier, and he drove home at 50 mph. his driving time to and from work was 1 hour and 28 minutes. how far does he live from his? job?