What did Einstein consider was the greatest blunder of his career?
A. Not predicting that the universe is expanding
B. Not predicting the existence of photons
C. Not predicting that light in glass or other transparent material will travel at less than "the speed of light in a vacuum
Ans: A. Not predicting that the universe is expanding
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A 60-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 25 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder
a. 1.4E+1 N b. 1.6E+2 N c. 2.4E+2 N d. 2.7E+2 N e. 4.2E+3 N
A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 5.85 s. What was the height from which the ball was dropped? (g = 9.80 m/s2 and assume air resistance is negligible)
a. 1.88 × 10^2 m b. 1.68 × 10^2 m c. 1.38 × 10^2 m d. 3.36 × 10^2 m
Kim is in a spaceship moving past you at half the speed of light. Which of the following correctly describes how you will perceive each other's time?
A) You will say that Kim's time is running slow, and she will say that your time is running fast. B) You will say that Kim's time is running slow, and she will say that your time is running slow. C) You will say that Kim's time is running fast, and she will say that your time is running slow. D) You will both agree that time runs at the same rate for both of you.
A series circuit consists of a 50-Hz ac source, a 50-? resistor, a 0.50-H inductor, and a 60-?F capacitor. The rms current in the circuit is measured to be 3.1 A
What is the voltage amplitude of the source? A) 510 V B) 270 V C) 220 V D) 180 V E) 160 V