Waves sometimes travel by squeezing together and then do what

How do air quality scientists ensure the air is cleaned? What steps do they take?

A closed system's internal energy changes by 178 J as a result of being heated with 658 J of energy. The energy used to do work by the system is J.

There is a bus moving at 30.2 m/s and the bus must now jump a 50 foot gap in the freeway. if the interchange has a 5° incline how far can the bus travel and still land on the same vertical level after leaves the ramp?

The process of generating electricity from dams and nuclear power plants is very different, but some of the energy transformations are the same. which energy transformations occur in both dams and nuclear power plants? check all that apply.

Which of the following situations would cause light to refract? A. traveling through a vacuum B. passing from one glass block to another C. moving through the air D. moving from air to water

Dark matter has been detected by its

The catcher catches a. 5 kg baseball traveling at 40 m/s and the glove is pushed back 10 cm. What average force did the catcher put on the ball?

Describe the climate and name the climate zone at alaska; portland, oregon; and key west, florida.

If a river is 20 feet wide in nature and needs to be scaled to one-tenth its real size, how wide should it be in a model?

A sample has a density of 30 g/ml. there is 60 ml of this substance. how much does it weigh?