You feel warm from the Sun at the beach because of heat radiation
a. True
b. False
Indicate whether the statement is true or false
True
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Based on a comparison of the radio, infrared, and visible-light images, we can conclude that gas clouds containing molecules
A) absorb roughly equal amounts of infrared starlight and visible starlight B) absorb substantial amounts of visible starlight but no infrared starlight C) absorb infrared starlight less effectively than they absorb visible starlight
In the year 2000, the average size of a transistor in a microprocessor was 250 nanometers. A human hair has a diameter of 70 microns (micrometers). How many transistors fit across a human hair?
A) 280 B) 28 C) 2800 D) 2.8 E) 0.28
A horizontal force of 850 N is needed to overcome the force of static friction between a level floor and a 350-kg crate. If g = 9.8 m/s2, what is the coefficient of static friction?
a. 24.8 b. 2.48 c. 4.04 d. 0.248 e. 2.43
The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a distance of 12.0 cm, what is its maximum speed when the engine is running at 3000 rpm?
a. 4.71 m/s c. 44.0m/s b. 9.42 m/s d. 22.0 m/s