Which causes the production of vitamin D in humans?

A. ultraviolet rays

B. radio waves

C. gamma rays

D. X-rays

Describe the real-world examples of Newton's third law that were identified in "Applications of Newton's Laws."

How do you figure out escape velocity

A child and sled with a combined mass of 54.6 kg slide down a frictionless hill that is 8.97m high. If the sled starts from rest what is its speed at the bottom of the him?

Which of the following most accurately represents John Dalton's model of the atom?

The mass of the products (solid and gaseous) of a fire is the same as the mass of the fuel and oxygen consumed in the fire. true or false

Venus's average distance from the sun is 0.72 AU and Saturn's is 9.54 AU. Calculate the orbital velocity of Venus and Saturn around the sun. (The mass of the sun is 1.99 X 10^30 KG. an AU is 1.50 X 10^11 M.

Caleb's parent drove him to a swim meet 208 km away. It took them 2 hours, which included a 15-minute break to refuel. What was their average driving speed?

Why is thermal energy from the Sun transferred to Earth through electromagnetic waves instead of any other type of thermal energy transfer? Electromagnetic waves can carry energy through matter. Electromagnetic waves can travel through empty space.

Why do different elements emit different colors of light

In an experiment, 108 J of work was done on a closed system. During this phase of the experiment, 79 J of heat energy was added to the system. What was the total change in the internal energy of the system?