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

All flowering plants are gymnosperns true or false

Energy degradation takes place in the energy transformations which occur in the generation of electrical power. Explain what is meant in this context by energy degradation.

At noon, the temperature was 12º. it rose 8º during the afternoon, and then dropped 28º by midnight. what was the temperature at midnight

A person is pushing 108 kg box with a 325 n force if the friction force is 55 n what is the acceleration of the box

The main difference between turbojets and rocket engines is the fact that A. turbojets are not dependent on oxygen from the air. B. rocket engines need oxygen from the air. C. turbojets carry their own supply of oxygen as oxidizers. D.

The highest peak in the vicinity (<100 kilometers) of Mt. Kilimanjaro is located to the: a. north. b. west c. east. d. south. e. northeast

Which of the following lists contains only examples of renewable sources of energy? A. wind, tidal, geothermal, and hydroelectric B. coal, solar, wind, and biomass C. fossil fuels and nuclear energy D. hydroelectric, petroleum, solar, and wind

The part of a longitudinal wave that is least dense is called a (n) rarefaction refraction contraction compression

if 100 grams is equal to 1 newton of force, and the water displaced by an object would have a mass of 40 grams, what is its buoyant force on that object?

A charge if 2 nC is placed 10cm to the right of a conducting sphere with a diameter of 2 cm. A charge of 5 nC is placed 10 nC to the left of the same sphere. determine the charge at the center of the sphere.