Sebastian has drawn a free-body diagram for a ladder of mass m leaning against a frictionless wall. His diagram is shown below. What is his error?
?
?
A.
is in the wrong direction.B.
should be directed upwards, not down.C.
should be perpendicular to the wall, not parallel to it.D.
should be down into the floor for 
to have the given direction.E.
is correct, but there should also be a force perpendicular to the wall.Answer: C
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Superconductors have been discussed as a means for electrical energy storage. Because they are resistanceless, a current once started in a loop would continue without loss. If a current of 1.0 × 10^4 A were started in a huge toroidal coil of radius 1.0 km and inductance 50 H, how much electrical energy (in kWh) could be stored?
a. 300 kWh b. 480 kWh c. 690 kWh d. 840 kWh
Gas, lava, and pyroclastics are the three general products emitted during a(n) ______________
Fill in the blank(s) with correct word
Pulsars:
A) spin very rapidly when they're young. B) are the cause of gamma-ray bursts. C) spin very slowly when they're young, and gradually spin faster as they age. D) generally form from 25 solar mass stars. E) emit radio in all directions.
Any rock having a very large mass would necessarily
A) be very difficult to accelerate. B) move very slowly. C) have a very large weight. D) All of the above. E) need to go on a diet.