Explain the purpose of oxidation numbers?

The common name for the reflection of sound waves is an?

An arrow is shot from a height of 1.55 m toward a cliff of height H. It is shot with a velocity of 26 m/s at an angle of 60° above the horizontal. It lands on the top edge of the cliff 3.99 s later. (a) Draw a sketch of the given example.

A straw placed in a clear glass of water appears to break at the water's surface. Which explains this effect? A). The water is transparent, but the glass is translucent. Scattering causes the straw to appear broken. B).

A worker pulls horizontally on a crate across a rough horizontal surface, causing it to move forward with constant velocity. Force A is the force exerted by the worker and force B is the force of friction due to the surface.

What is the potential energy of a 900 kg rock positioned on a cliff 30 m above the ground?

when two object P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity of P to Q

Why do we say energy is the ability to do work

Explain the difference between mass and weight (in at least 2 sentences)

Is it possible for a nazi style government to exist in the modern world? Explain why or why not.

What is likely to happen if a balloon that was blown up at a low altitude is brought to a high altitude? Why would this occur?