Matter falling into a black hole forms a(n) _______________ disk
Fill in the blank(s) with correct word
accretion
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Fireworks go off at the same time according to Earth clocks in two cities, Alum and Boron, that are 300 km apart. The people in a spaceship that is flying in a straight line from Alum to Boron at 0.80c also observe the fireworks. Do they see the fireworks in the two cities simultaneously? If the people in the spaceship say the fireworks were not simultaneous in Alum and Boron, how long before or
after the fireworks flashed at Alum did the fireworks flash at Boron according to their calculations? (The spaceship is directly over Alum when the fireworks flash.) a. Yes; 0 b. Before; 1.0 × 10^?3 s c. After; 1.0 × 10^?3 s d. Before; 1.3 × 10^?3 s e. After; 1.3 × 10^?3 s
Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 × 10^–5 W•m and the resistivity of aluminum is 2.82 × 10^–5 W•m
a. L1 = 0.36 L2 c. L1 = 0.60 L2 b. L1 = 2.8 L2 d. L1 = 1.7 L2
Gamma rays are emitted by way of
A) ionizing radiation. B) transitions within an atom's innermost electrons. C) transitions within the atomic nucleus. D) none of the above
The switch in the figure is closed at t = 0 when the current I is zero. When I = 15 mA, what is the potential difference across the inductor?
a.
240 V
b.
60 V
c.
0
d.
180 V
e.
190 V