The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.120 m) cos (pt/16). What is the maximum net force on the mass as it oscillates?
a. 0.98 × 10^-3 N
c. 3.0 × 10^-3 N
b. 7.4 × 10^-3 N
d. 4.7 N
C
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A nearby star has a parallax of 0.2 arc seconds. What is its distance?
A) .1 parsec B) .2 parsec C) .5 parsec D) 5 parsecs E) 50 parsecs
On the H-R diagram, 90 percent of all stars are ____
a. either giant or supergiant stars b. white dwarfs c. main sequence stars d. sred dwarfs e. binary stars
The main reason for building large optical telescopes on Earth's surface is
a. that there is a lot of money in science that needs to get spent. b. to collect as much light as possible from faint objects. c. to nullify the blurring effects of the Earth's atmosphere and thus produce higher resolution images. d. to bring astronomical objects closer to make them brighter. e. that the warm temperatures of the Earth's surface allow for easier telescope operation.
An inventor discovers a harmless and tasteless salt, which when added to water changes its boiling point. The market value for this salt will be better if the salt
A) lowers the boiling point of water. B) raises the boiling point of water. C) either raises or lowers the boiling point, as the food would be cooked either way. D) none of the above