Which of these are not mechanical waves and can be used to send a signal to astronauts on the moon?

A) sound waves

B) radio waves

C) both sound waves and radio waves

D) neither sound waves or radio waves

How long does it take to learn acoustic guitar?

Which type of wave is not a light wave A) red waves B) radio waves C) ultra-violet waves D) sound waves

What does momentum mean?

Saturn has an orbital period of 29.46 years. In two or more complete sentences, explain why Saturn's orbital takes this long?

An airplane dropped a flare from a height of 2860 feet above a lake. How many seconds did it take for the flare to reach the water?

Describe the factors that form deep currents

A comet is cruising through the solar system at a speed of 50000 kilometers per hour for 4 hours time. What is the total distance traveled by the comet during this time in kilometers, miles, and light years?

A gas in a closed container is heated with 12J of energy, causing the lid of the container to rise 3m with 5N of force. What is the total change in energy?

What are illuminated objects?

During one year a population of blue jays has zero population growth. which must be true about the blue jay population at the end of the year compared to the beginning of the year?