Most stars on the H-R diagram are on the ____________________
Fill in the blank(s) with correct word
main-sequence
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painter of weight W climbs a ladder of weight W/3 and length L. At the position shown in the figure, the ladder begins to slip. Assume that there is a frictionless roller at A. What is the coefficient of static friction, ?s , at B?
(A) 0.19
(B) 0.33
(C) 0.68
(D) 0.24
In a greenhouse, electromagnetic energy in the form of visible light enters the glass panes and is absorbed and then reradiated. What happens to this reradiated electromagnetic radiation from within the greenhouse?
a. 100% returns to the atmosphere. b. It's partially blocked by glass. c. It's transformed into ultraviolet upon striking the glass. d. It's reflected as visible light upon striking the glass.
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 25 radians per seconds, then the tangential velocity of a point on the circumference is
A. 1.0 m/s. B. 1.5 m/s. C. 2.0 m/s. D. 2.5 m/s. E. 3.0 m/s.
In general, sound travels faster through:
a) solids than through gases b) gases than through solids c) gases than through liquids d) empty space than through matter