A 2-m long wire is carrying a current of 2 A. The wire is placed at an angle of 60° with respect to a magnetic field. If the wire experiences a force of 0.2 N, what is the strength of the magnetic field?
A)
0.02 T
B)
0.03 T
C)
0.04 T
D)
0.05 T
E)
0.06 T
E
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When evaporation at the ocean surface exceeds precipitation, the salinity of seawater
A) increases. B) decreases. C) stays the same.
Which of the following statements does not use the term angular size or angular distance correctly?
A) The angular distance between those two houses in the distance is 30 degrees. B) The angular distance between those two bright stars in the sky is about 2 meters. C) The angular size of the Sun is about the same as that of the Moon. D) You can use your outstretched hand against the sky to estimate angular sizes and angular distances.
An ideal spring has a spring constant (force constant) of 60 N/m. How much energy does it store when it is stretched by 1.0 cm?
A) 0.30 J B) 60 J C) 0.0030 J D) 600 J
Currently, which of the following gases contributes the most toward the greenhouse effect?
What will be an ideal response?