What is the magnitude of the current in the 20-? resistor?
a.
0.75 A
b.
0.00 A
c.
0.25 A
d.
0.50 A
e.
1.00 A
d
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A spectral line produced in the atmosphere of a star may be seen as broad whereas interstellar _______________ lines are very narrow
a. absorption b. continuous c. emission d. All of the other choices are correct.
In which part of the electromagnetic spectrum have astronomers been unable to get any information?
A) Gamma rays B) X-rays C) Ultraviolet D) Microwaves E) We now can access information in all spectral lengths.
Determine the heat capacity (in calories/°C) of a lake containing one million gallons (approximately 4 million kilograms) of water at 15°C
a. 4 × 10^6 b. 4 × 10^9 c. 4 × 10^3 d. 1 × 10^3 e. 4 × 10^2
A popular demonstration involves a professor, initially motionless, standing on a low-friction turntable and holding a bicycle wheel that is spinning horizontally. What happens when the professor flips the bicycle wheel so that it is spinning in the other direction?
1.She starts to spin in the same direction as the initial direction of the bicycle wheel. 2.She starts to spin in the bicycle wheel's new spin direction. 3.She remains stationary. 4.It is impossible to tell because it depends on how fast the bicycle wheel initially spins.