A 5-turn square loop (10 cm along a side, resistance = 4.0 ?) is placed in a magnetic field that makes an angle of 30° with the plane of the loop. The magnitude of this field varies with time according to B = 0.50t2, where t is measured in s and B in T. What is the induced current in the coil at t = 4.0 s?
a. 25 mA
b. 5.0 mA
c. 13 mA
d. 43 mA
e. 50 mA
a
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When U-238 emits an alpha particle, the resulting nucleus has
A) 90 protons. B) 91 protons. C) 92 protons. D) 93 protons. E) 94 protons.
10 joules of heat energy are transferred to a sample of ideal gas at constant volume. As a result, the internal energy of the gas
A. increases by 10 J B. increases by less than 10 J C. increases by more than 10 J D. remains unchanged.
Hubble's law can be applied to measure the distance of the constellation of Orion.
Answer the following statement true (T) or false (F)
How does Drake define a technological civilization?
A) one that can get into space B) one that can communicate over interstellar distances C) one that has a written language D) one that can construct metal tools E) one that can have the intelligence not to destroy itself