A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If 555 J of work are done by the strap while moving the suitcase a horizontal distance of 15m what is the tension in the strap?
A) 52 N B) 46 N C) 56 N D) 37 N
B
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Refer to the H-R diagram above that shows the life track of a 1-solar-mass star, with various stages labeled with Roman numerals. After all its life stages are completed, the remaining core of this star will be left behind as
A) a white dwarf made primarily of carbon and oxygen. B) a white dwarf made primarily of hydrogen. C) a neutron star. D) a black hole. E) a supernova.
Match the words at the left to the correct blanks in the sentences at right. Use each choice only once.
A. A camera is an example of an instrument used for _________observations. B. _________ refers to telescopic observations in which we separate an object's light so we can measure its intensity at different wavelengths. C. If we want to confirm that a star's brightness alternately dims and brightens, we need __________ observations of the star. D. The familiar twinkling of the stars is caused by _____________, which also blurs telescopic images. E. Human civilization is responsible for what astronomers call ____________.
CCD detectors gather light 10-20 times faster than the most sensitive photographic film
Indicate whether the statement is true or false
"Physics" could best be described as the study of
A) atoms in motion. B) matter. C) the general principles underlying natural phenomena. D) the application of science to the needs of human beings. E) the absolute, or certain, truths about the natural world.