A rectangular loop (area = 0.250 m2) turns in a uniform magnetic field with B = 0.210 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is ?/2 rads and increasing at the rate of 0.530 rad/s, what is the magnitude of the emf induced in the loop?
a. 5.25E–2 V
b. zero
c. 2.78E–2 V
d. 9.91E–2 V
e. 1.47E–2 V
c
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Suppose you have a spool of thread that can rotate around a fixed axis as you pull thread off it. If you pull the thread with your hand so that the thread always lies along a certain fixed line, how will your hand’s speed as it moves compare to 
, where R is the spool’s radius and 
is angular speed?
A. The hand’s speed will be greater than 
.
B. The hand’s speed will be less than .
C. The hand’s speed will be equal to .
D. The hand’s speed has nothing to do with .
How do astronomers know that the Crab Nebula is the remains of a supernova?
What will be an ideal response?
Tuning forks #1, #2, and #3 each have slightly different frequencies.When #1 and #2 are sounded together, a beat frequency of 3 Hz results. When #2 and #3 are sounded together, a beat frequency of 5 Hz results. If the frequency of #1 is 100 Hz, which of the following cannot be the frequency of #3?
A. 92 Hz B. 95 Hz C. 98 Hz D. 102 Hz E. 108 Hz
The ______________ for compounds are written by putting the composing elements' symbols adjacent to each other, with subscripts indicating the number of atoms of each
a. equations b. molecules c. isotopes d. formulas