Which of the following phenomena provides evidence of electric fields in the atmosphere?

a.) lightning

b.) clouds

c.) rainbows

d.) wind

How much power does an average person input into their body

How can you increase the strength of a magnetic field inside a solenoid? a. increase the number of coils per unit length c. place an iron rod inside the solenoid b. increase the current d. all of the above

A soccer player kicks a ball horizontally off a 40.0-m-high cliff into a pool of water. If the player hears the sound of the splash 3.00 s later, what was the initial speed given to the rock? Assume the speed of sound in air is 343 m/s.

How much 8 grams will weigh after a physical change

G a person of mass 100 kg is riding an elevator which was initially moving up with a velocity of 3 m/s. over a distance of 4 m the elevator slows down to 1 m/s. find the "apparent" mass of the person during that time (as the elevator slows down).

Which of the following substances will show the smallest change in temperature when equal amounts of energy are absorbed? water air sand concrete

The downward acceleration of a falling body on Earth is 9.81m/s2. On the moon the same quantity is 1.62m/s2. An astronaut in a space suit has a mass of 145kg.

Explain how a guitar produces sound by using the terms standing waves and resonance.

Why can only igneous rock be formed directly from magma?

Streamlined objects are smooth and?