You would like to buy a full-length mirror which allows you to see yourself from head to toe. The minimum height of the mirror is
A. half your height.
B. two-thirds of your height.
C. equal to your height.
A. half your height.
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What was Eratosthenes's mathematical contribution to the history of astronomy, even though it was incorrect? a. He calculated the diameter of Earth by what he learned from travelers' itineraries
b. He estimated Earth's revolution rate by measuring the length of shadows casted on the surface. c. He determined that all the planets orbited Earth every 24 hrs. d. He attempted to calculate Earth's radius by utilizing the position of sunlight. e. He believed all of nature was underlain by musical principles.
A tow truck exerts a force of 3000 N on a car that accelerates at 2 m/s2. What is the mass of the car?
A) 500 kg B) 1000 kg C) 1500 kg D) 3000 kg E) none of these
Indicate the validity of the following decay processes. For any reactions which are not valid (that is, not permitted), give a reason. (a) ?0 —> ?0 + ?0 (b) ?? —> ?? + ?? (c) ?0 —> ?0 + ?0 + ?+
At what rate are photons emitted by a 50.0-W sodium vapor lamp if it is producing monochromatic light of wavelength 589 nm?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)