Where can electromagnetic waves travel that mechanical waves do not

Why do astronauts muscles weaken?

1, Condensation occurs when: water is released from plants ground water moves to the surface surface water changes into water vapor atmospheric water changes into precipitation 2, What happens to the precipitation that reaches land?

a 2.5 kg rock is dropped off a 32 m cliff and hits a spring, compressing it 57cm. what is the spring constant

A race-car driver achiveved a speed of speed of m/s in 14 seconds after taking off from ready at the starting line. What was the average acceleration during this time?

What engine thrust is required for a rocket of mass 35 kg to leave the launching pad? 3.5 N. 35 N. 351 N. 3,500 N. 35,000 N.

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?