Nucleosynthesis
a. is the process by which energy is produced at the center of the galaxy.
b. is the process by which hydrogen and helium are converted into heavier elements.
c. describes the structure of a globular cluster.
d. describes how the magnetic field of the galaxy traps cosmic rays.
e. describes the method by which neutral hydrogen produces 21-cm radiation.
b
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The temperature of a room is 300 K. What is the temperature in Fahrenheit?
A. 70.1
B. 74.2
C. 78.5
D. 80.3
E. 85.2
Photography Optics: A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens. You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens.(a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it?(b) What is the height of the flower's image on the CCD sensor?
What will be an ideal response?
Waves on a String: The density of aluminum is 2700 kg/m3. If transverse waves travel at 38 m/s in an aluminum wire of diameter 4.6 mm, what is the tension on the wire?
A. 65 N B. 39 N C. 52 N D. 78 N
What evidence do we have that Jupiter must have a substantial solid core under the thick clouds?
A) Its magnetic field must be form by rotating molten iron, like our own. B) Occasional breaks in the clouds reveal a solid surface at times. C) Jupiter's disk is more oblate than it should be, suggesting it has a higher density. D) Jupiter's disk is less oblate than it should be, if it were only hydrogen and helium. E) The Io flux tube goes straight down to Jupiter's iron core.