What is the most likely outcome after the collision between two spiral galaxies?
A. the destruction of most of their stars
B. formation of a larger galaxy
C. enhanced formation of spiral arms
D. All of these choices are correct.
Answer: B
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What makes the Crab Nebula pulsar unusual among other pulsars?
A) It is a magnetar, with far more intense magnetic fields than any other. B) It is the oldest known pulsar. C) Its period is much less regular than other pulsars. D) It is the fastest spinning known pulsar. E) It is relatively bright in shorter wavelengths, like visible and X-rays.
A car is moving in the positive direction along a straight highway and accelerates at a constant rate while going from point A to point B. If the acceleration is positive, increasing the speed of the car, when does the position where the average speed equals the instantaneous speed occur during the time interval from A to B? Assume the time interval is T
a. T/2 from the start of the interval b. before T/2 from the start of the interval c. after T/2 from the start of the interval d. It depends on the speed at the start of the time interval.
A 15.0 kg block of ice at 0.00°C falls into Lake Superior, which is a fresh water lake. The lake water is at 10.0°C, and the latent heat of fusion for ice is 3.34 × 105 J/kg
Find the change in entropy due to the melting of the ice (a) of the block of ice, (b) of the lake, and (c) of the system consisting of the lake and the ice. (d) Is your answer to part (c) consistent with the reversibility or irreversibility of the melting process?
What is the self-inductance of an ideal solenoid that is 300 cm long with a cross-sectional area of 1.00 × 10-4 m2 and has 1000 turns of wire? (?0 = 4? × 10-7 T ? m/
A) A) 4.19 nH B) 4.19 pH C) 4.19 ?H D) 41.9 nH E) 41.9 µH