In the diagram, ∠D is b

A) the angle of incidence

B) the angle of refraction

C) the complement of the angle of reflection

D) the complement of the angle of refraction described as which of these?

Oxygen and air are not synonyms. As a matter of fact air contains several gases. The most common gas in air is A) oxygen B) methane C) nitrogen D) carbon dioxide

Two teams of nine members each engage in a tug of war. Each of the first team's members has an average mass of 68 kg and exerts an average force of 1350 N horizontally.

In order to make an electromagnet, you need a

What is the suitable condition for the superconductivity and high resista (a) Weak phonon-phonon interactions (b) No interactions between the particles (c) Weak electron-phonon interactions (d) A strong electron-phonon interaction ос

Voltage = 80 v Current = 40 amps Resistance =

As an astronaut travels towards Earth, her weight A. decreases because gravity decreases. B. decreases because her mass decreases. C. increases because gravity increases. D. remains the same because her mass remains the same.

Lightning often strikes water. a. True b. False

How much work must be done on a 10 kg snowboard to increase its speed from 4 m/s to 6 m/s?

If a spacecraft that seems to be motionless in deep space is given some type of quick push, what will happen? A. The spacecraft will not move because it only works on earth. B.

A fast, white water cascade is also known as what?