What activates a convection current starting the flow of liquid

A boy jumps at a speed of 20.0 m/s at an angle of 25.0o above the horizontal. what is the horizontal component of the boy's velocity?

When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 45.0

Fluid pressure changes with depth are assumed to be linear. Which statement best explains why this does not hold true for atmospheric pressure changes?

A runner taking part in the 200 m dash must run around the end of a track that has a circular arc with a radius of curvature of 45 m. If he completes the 200 m dash in 27.

How much physical activity do children and teens need? A. 60 minutes at least twice a week B. 60 minutes at least five days a week C. 150 minutes a week D. 150 minutes at least five days a week

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.

Ethylene (C2H4) reacts with oxygen gas to produce carbon dioxide and water. 45.0 grams of ethylene reacts, how many grams of carbon dioxide gas will be produced?

What causes ice to melt and water to boil

A block of mass 3.5 kg slides down a frictionless inclined plane of length 6.4 m that makes an angle of 30 degrees with the horizontal. if the block is released from rest at the top of the incline, what is its speed at the bottom