Finding spring constant given displacement of spring and distance traveled by a cart

WHY is it necessary that the wavelength of this solar radiation (especially in the visible range) be changed so that it can be retained as part of the greenhouse warming? What would happen if the wavelength weren't changed?

A train is slowing down with an average acceleration of - 5.0 m/s2 (negative sign shows deceleration). If its initial velocity is 50. m/s, how far does it travel in 6.0 seconds?

When you lift a book from the ground to your desk, what kind of work do you do, negative or positive? by lifting the book what do you change? Does it gain or lose energy? What kind of Energy?

What does the index of refraction directly measure?

Cause of a severe storm

When a siren is approaching you, how does the wavelength of the waves reaching you compare to the actual wavelength that the siren emits?

In a harbor, you can see sea waves traveling around the edges of small stationary boats. Why does this happen?

Correct unit of speed

Technician A says that for best results, loosen the fastener immediately after spraying it with penetrating oil. Technician B says that rusted fasteners may be loosened by tapping with a hammer. Which technician is correct? a. technician A only b.

A roller coaster track is 3,000 meters long. It takes 100 seconds to travel once around the roller coaster. Is the velocity constant throughout the trip? Explain.