What is true about radio waves

Not every lightning strike produces thunder. a. Trueb. False

Where is almost all the mass of an atom?

Would you hear an echo if you shouted in your bedroom? Explain your answer.

How fast are the earths tectonic plates moving on average

A positively charged ion will bond with A) a negatively charged ion. B) a neutral atom. C) another positively charged ion. D) nothing else.

A starship passes Earth at 80% of the speed of light and sends a drone ship forward at half the speed of light rela - tive to itself. Show that the drone travels at 93% of the speed of light relative to Earth.

Rubies are used in electronics

Two kids are on a merry-go-round that is turning at a constant rate. ariel is near the outer edge, and bob is closer to the center. ariel has answer (smaller, the same, or greater angular speed?

Visit this website and locate the element mercury, whose chemical symbol is Hg. Click on the square to read about the history, properties, and uses of mercury. Name three uses for mercury.

Ten seconds after starting from rest, a car is moving at 40 m/s. what is the car's acceleration in meters per second per second?