We observe that most galaxies are moving away from us. If we could (somehow) communicate with an observer in a distant galaxy, what would that observer say about what it sees?
A) Most galaxies are moving away from me, except for yours.
B) Most galaxies are moving away from me, including yours.
C) Most galaxies are moving away from you, and about half are moving towards me.
B) Most galaxies are moving away from me, including yours.
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Friction: Jason takes off across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis produce a forward thrust of 200 N and have a coefficient of kinetic friction with water of 0.10. Unfortunately, the skis run out of fuel after only 90 s. What is Jason's top speed?
A. 150 m/s B. 240 m/s C. 24 m/s D. 90 m/s
Suppose you discovered a galaxy with a mass-to-light ratio of 0.1 solar mass per solar luminosity. What would this measurement say about the nature of the stars in this galaxy?
What will be an ideal response?
Free Fall: A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?
A. 4a B. 2a C. a D. a/2 E. a/4
Current: A jeweler needs to electroplate gold, having an atomic mass of 196.97 g/mol, onto a bracelet. He knows that the charge carriers in the ionic solution are singly-ionized gold ions, Au+, and has calculated that he must deposit 0.20 g of gold to reach the necessary thickness. How much current does he need to plate the bracelet in 3.0 hours? (e = 1.60 × 10-19 C, NA = 6.02 × 1023 atoms/mol)
A. 9.1 mA B. 540 mA C. 33 A D. 1800 mA