Contrast observations of ionized and neutral hydrogen in space
What will be an ideal response?
Emission nebula glow bright red from the ionized hydrogen around hot young stars, but most of the hydrogen is cooler and neutral and transparent; it can best be mapped from its 21 cm radio emission instead.
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A 3.0 kg mass is connected to a spring with a spring constant of 6.0 N/m. The velocity is given by the expression v(t) = 10.0 cm/s sin
What is the maximum velocity of the simple harmonic motion?
A. 10 cm/s B. 14 cm/s C. 17 cm/s D. 20 cm/s E. 25 cm/s
Why are the temperature fluctuations observed in the cosmic microwave background are important?
What will be an ideal response?
Gas falling into a black hole:
a. is heated to millions of degrees through the loss of gravitational energy b. is cooled to near absolute zero through the loss of gravitational energy c. releases energy, all of which is absorbed by the black hole d. never reaches the black hole due to the effect of time dilation e. orbits the black hole but cannot cross the event horizon
Determine the total resistance of a 10-ohm resistor and a 30-ohm resistor connected in parallel.