All modern large optical telescopes are refractors
Indicate whether the statement is true or false
FALSE
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A window washer pulls herself upward using the bucket–pulley apparatus shown in the Fig.
(a) How hard must she pull downward to raise herself slowly at constant speed?
(b) If she increases this force by 15%, what will her acceleration be?
Positive work can be done
a. by friction on the tires when a car is accelerating without skidding. b. by a spring when it launches a clown in the air. c. by a hand throwing a ball. d. by all of the above. e. only by (b) and (c) above.
A fancy sports car passes Big Ben at a speed of 0.600 c. What time interval will the driver measure for a one-second interval on the large clock?
a. 1.67 s b. 0.800 s c. 1.25 s d. 0.600 s e. 1.00 s
If heavier elements are more stable when they have more neutrons, what happens to the heaviest elements?
a. They have very large nuclei to sustain the number of neutrons needed for stability. b. Above a certain atomic mass, there are no stable elements. c. For high enough atomic mass, there is no longer a rule to determine which nuclei are stable. d. The curve reverses and the nuclei of the heaviest elements are more even matches of protons and neutrons. e. The curve reverses completely and the nuclei of the heaviest elements are stable with many more protons than neutrons.