Why isn't space expanding within systems such as our solar system or the Milky Way?
A) Hubble's law of expansion applies only to the space between galaxies.
B) We are so close to these systems that we don't observe their expansion.
C) The universe is not old enough yet for these objects to begin their expansion.
D) Their gravity is strong enough to hold them together against the expansion of the universe.
D
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If H equals 70 km/sec/Mpc, then a galaxy with a radial velocity of 2100 km/sec has a distance of approximately
a. 2170 Mpc b. 2030 Mpc c. 30 Mpc d. 0.03 Mpc e. 147,000 Mpc
Addition by Components: You walk 33 m to the north, then turn 60° to your right and walk another 45 m. Use components to find how far you end up from your starting point.
A. 68 m B. 39 m C. 75 m D. 35 m
A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the vertical impulse the catapult receives from the rock is
A.
s.B.
s.C.
s.D.
s.E.
s.Fission fragments are always identical
a. True b. False Indicate whether the statement is true or false