What are the "friends" (i.e. other types of galaxies) referred to in the Riddle?
A: Many giant elliptical galaxies that are always found nearby a spiral.
B: Black hole galaxies clustered around the spiral galaxy.
C: Nearby dwarf galaxies clustered around the spiral galaxy.
D: Nebulae that look like other galaxies and change the gravity around the spiral.
E: Many large spiral galaxies that are always found nearby a spiral.
Answer: C: Nearby dwarf galaxies clustered around the spiral galaxy.
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According to the steady state theory, the universe did not expand
Indicate whether the statement is true or false
Exhibit 16-1
A graph of position versus time for an object oscillating at the free end of a horizontal spring is shown below.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 16-1. A point or points at which the object has positive velocity and zero acceleration is(are)
A. B B. C C. D D. B and D E. A and E
The energy stored in a stretched spring is an example of gravitational potential energy
a. True b. False Indicate whether the statement is true or false
If you confine an electron to a box and know that the uncertainty in the electron's speed is 65 m/s,
what is the smallest length that the box could have? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) A) 8.4 × 10-6 m B) 1.1 × 10-5 m C) 1.8 × 10-5 m D) 5.8 × 10-6 m E) 1.8 × 10-6 m