"Light travels at the rate of 300,000 kilometers per second in a vacuum." Which of these statements is correct about this law?

a. It is a fact in nature which cannot be tested.

b. It is a theory which is not supported by data.

c. It is an observation which cannot be explained.

d. It is a description which does not work under similar conditions.

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?