Identify which stage marks the birth of a star

Where low tide occurs

Two identical rocks are dropped from different heights. The higher one starts out four times as high as the lower one. How much faster is the higher one going just before they hit?

What is the difference between a solar cell and a solar panels

To escape Earth's gravitational pull, an object mush reach a speed of 11,180 meters per second. how fast is this kilometers per second

What is the difference between amplitude modulation and frequency modulation

What is cell in electricity?

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.