All pulsars are neutron stars; why is the reverse not true?
What will be an ideal response?
Most neutron stars have slowed down enough to not give off much rotational energy, and many pulsars are not spinning in a plane where we can spot them.
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The figure shows a 2000 kg cable car descending a high hill. A counterweight of mass 1800 kg on the other side of the hill aids the brakes in controlling the cable car's speed. The rolling friction of both the cable car and the counterweight are negligible. How much braking force does the cable car need to descend at constant speed?
A) 3800 N B) 2900 N C) 2000 N D) 980 N
A person pours 330 g of water at 45°C into an 855-g aluminum container with an initial temperature of 10°C. The specific heat of aluminum is 900 J/(kg ? K) and that of water is 4190 J/(kg ? K)
What is the final temperature of the system, assuming no heat is exchanged with the surroundings? A) 28°C B) 32°C C) 31°C D) 33°C E) 35°C
In the previous question, just before hitting the ground, what is the final speed of the heavy stone compared to the light one?
a) quarter as much b) half as much c) the same d) twice as much e) four times as much
An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the conductor. There are no other charges in the vicinity. Which statement about this conductor is true?
(There may be more than one correct choice.) A) The inner surface of the conductor carries a charge of -10 µC and its outer surface carries no excess charge. B) The inner and outer surfaces of the conductor each contain charges of -5 µC. C) The net electric field within the material of the conductor points away from the +10 µC charge. D) The outer surface of the conductor contains +10 µC of charge and the inner surface contains -10 µC. E) Both surfaces of the conductor carry no excess charge because the conductor is uncharged.