What is the meaning of critical angle in physics

If you are trying to loosen a stubborn screw from a piece of wood with a screwdriver and fail, should you find a screwdriver for which the handle is longer or fatter?

How long (in ns) does it take light to travel 1.0 m in vacuum?

Explain why the element carbon, rather than sodium, is important in forming natural polomers

A well lagged copper calorimeter of mas 120g contains 70g of water and 10g ice both at 0°C. Dry steam at 100°C is passed in until the temperature of the mixture is 40°C. Calculate the mass of the steam condensed.

The second law of thermodynamics states that (select one): a. energy is the ability to do work. b. useful energy is lost when converting from one form of energy to another. c. energy can neither be created nor destroyed. d.

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?