A flat circular coil has 250 identical loops of very thin wire. Each loop has an area of 0.12 m2 and carries 15 mA of current. This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop
What is the magnitude of the magnetic moment of the coil?
0.45 A ? m2
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How long would one need to observe a star on a 10 meter telescope to collect the same amount of light as one collects in one hour on a 5 meter telescope?
A) 30 minutes B) 5 minutes C) 2.5 hours D) 15 minutes E) 1 hour
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
and 
, what is the direction of the vector 
?
A. ?49°
B. ?41°
C. ?90°
D. +49°
E. +21°
Which of the following statements does not lend support to the idea that carbon dioxide is a cause of global warming?
A) Models of the greenhouse effect successfully predict the actual temperatures of Mars and Venus from their atmospheric carbon dioxide amounts. B) Models of Earth's climate that include recent increases in carbon dioxide concentration match the observed temperature increases better than those that do not include it. C) We understand the physical mechanism of the greenhouse effect, by which carbon dioxide increases cause an increase in the planet's temperature. D) Isotope ratios in atmospheric carbon dioxide show that much of the carbon dioxide in Earth's atmosphere today comes from the burning of fossil fuels.
The length of a telescope is 2.00 m and the focal length of the objective lens is 2.0 cm. What is the focal length of the eyepiece?
A) 200 cm B) 202 cm C) 101 cm D) 2.0 cm E) 198 cm