mechanical (sound) waves are unable to travel through a vacuum such as through space but radio waves are transmitted to earth from satellites. how is this possible

If you are caught outdoors in a thunderstorm, why shouldn't you stand under a tree? Can you think of a rea - son why you should not stand with your legs far apart? Or why lying down can be dangerous? (Hint: Consider the electric potential difference.

When the daughter nucleus produced in a radioactive decay is itself unstable, it will eventually decay and form its own daughter nucleus.

An inductor with L = 9.80 mH is connected across an ac source that has voltage amplitude 41.5 V. What value for the frequency of the source results in a current amplitude of 4.50 A?

How does the theory of plate tectonics support the theory of seafood spreading?

You push backward against the ground to move a skateboard forward the force you make acts against the ground what force acts against you to move you forward

The average speed of a runner who runs 500 m in 96 s is what?

What is the net force on a 2-kg skateboard accelerating at a rate of 2 m/s2?

Which is a consequence of the third law of thermodynamics

Difference between Heterozygous and homozygous?

A wave has a speed of 50 m/s and a frequency of 10 Hz. Calculate its wavelength.