What did Le Verrier and Adams do differently than Herschel when they discovered Neptune?
a. found the planet by scanning thousands of photographic plates
b. found the planet by accident by simply searching the sky
c. applied the basic laws of physics to discover Neptune's position
d. applied a newly modified telescope to find the position of Neptune
e. witnessed the parallax of Neptune and calculated its position
c
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In the context of binary pulsars, in Hercules X-1, _____
A) matter flows from a star into an accretion disk around a dead star, producing gamma rays B) a 6-solar-mass star and a neutron star orbit each other with a period of 28.7 days C) several low-energy processes go on simultaneously D) X-rays turn off when the neutron star is eclipsed behind the normal star
The accident at Three Mile Island began when
A) the moderator malfunctioned so that the reaction got out of control. B) a water pump failed. C) the control rods didn't insert properly. D) the pressurizer ruptured [i.e., broke open] and there was no backup pressurizer to replace it. E) the heat exchanger failed to operate properly.
A 12.0-kg mass is placed on a 29.0° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.660, and the coefficient of sliding friction is 0.546 . The mass is given a shove causing it to slide down the incline. What is the frictional force while the mass is sliding?
a. 57.0 N b. 102.9 N c. 56.2 N d. 67.9 N e. 10.5 N
A liquid has a specific gravity of 0.68. What is its density?
A) 680 kg/m3 B) 1360 kg/m3 C) 1000 kg/m3 D) 6800 kg/m3