Stars much more luminous than the Sun have
A) narrower habitable zones, decreasing the odds of finding habitable planets and lifetimes too short for life to appear
B) wider habitable zones, increasing the odds of finding habitable planets but lifetimes too short for life to appear
C) narrower habitable zones, decreasing the odds of finding habitable planets but much longer lifetimes allowing life to appear and evolve
D) wider habitable zones, increasing the odds of finding habitable planets and much longer lifetimes allowing life to appear and evolve
B
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A 120 N traffic light is located at the midpoint of a cable between two poles. The cable makes and angle of 30
to the horizontal at each pole. What is the tension in the cable?
A. 60.0 N B. 90.0 N C. 140 N D. 110 N E. 120 N
Which of these is correct?
A) a piece of solid iron floats in molten iron. B) a piece of solid aluminum floats in molten aluminum. C) a piece of ice floats in water. D) all the above E) none of the above
The index of refraction for a given material is directly proportional to the frequency of light
Indicate whether the statement is true or false
A hydraulic lift raises a 2 000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm2, what is the cross-sectional area of the larger piston?
a. 40 cm2 b. 80 cm2 c. 196 cm2 d. 392 cm2 e. 160 cm2