The diagrams below show forces of magnitude F applied to an equilateral triangular block of uniform thickness. In which diagram(s) is(are) the block in equilibrium?
a.
A
b.
B
c.
C
d.
D
e.
A and B
b
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A conducting sphere of radius 20 cm has a charge Q placed on it producing a field of magnitude
If the potential at the surface was
when the field was 
what is the potential when the field is 2
?
A.
B. 2
C. 4
D. 5
E. 16
Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. What is the least abundant element with an atomic number less than iron's?
A) hydrogen B) lithium C) beryllium D) nitrogen
Coil 1, connected to a 100-? resistor, sits inside coil 2. Coil 1 is connected to a source of 60 cycle per second AC current. Which statement about coil 2 is correct?
A. No current will be induced in coil 2. B. DC current (current flow in only one direction) will be induced in coil 2. C. AC current (current flow in alternating directions) will be induced in coil 2. D. DC current will be induced in coil 2, but its direction will depend on the initial direction of flow of current in coil 1. E. Both AC and DC current will be induced in coil 2.
When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is
A) less than 1000 N. B) more than 1000 N. C) 1000 N. D) need more information