Strictly speaking, when you step off a curb you are momentarily
A) in orbit.
B) weightless.
C) in space.
Answer: B
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The figure shows two wires that are tied to a 710 g mass that revolves in a horizontal circle at a constant speed of 7.5 m/s. What is the tension in the upper wire?
A) 34 N B) 20 N C) 27 N D) 41 N
Which of these colors of light has photons of greatest energy?
a. Red b. Orange c. Green d. Yellow
A 100-kg student eats a 200-Calorie doughnut. To "burn it off", he decides to climb the steps of a tall building. How high (in m) would he have to climb to expend an equivalent amount of work? (1 food Calorie = 103 calories.)
a. 273 b. 623 c. 418 d. 854 e. 8 400
Monochromatic laser light of frequency 5.20 × 1014 Hz is shown on a pair of thin parallel slits, and the pattern is viewed on a screen 1.20 m away
The fifth bright fringes (not counting the central fringe) occur at ±2.12 cm on either side of the central bright fringe. The entire apparatus is now immersed in a transparent liquid. When the experiment is repeated, the fifth bright fringes now occur at ±1.43 cm from the central bright fringe. (c = 3.00 × 108 m/s) (a) How far apart are the slits? (b) What is the index of refraction of the liquid?