In M82, observations indicate that there are several bright sources close to the center of the galaxy. These might be
A) supernovae.
B) accretion disks of supermassive black holes, millions of times as massive as our sun.
C) accretion disks of intermediate black holes, hundreds of times as massive as our sun.
D) accretion disks of stellar mass black holes.
E) red giants in the process of forming planetary nebulae.
C
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A greater gravitational field causes time to
A) speed up. B) slow down. C) fluctuate. D) Gravity has no measurable effect on time.
Conservation of Momentum: A dinner plate falls vertically to the floor and breaks up into three pieces, which slide horizontally along the floor. Immediately after the impact, a 200-g piece moves along the +x-axis with a speed of 2.00 m/s, a 235-g piece moves along the +y-axis with a speed of 1.50 m/s. The third piece has a mass of 100 g. What is the speed of the third piece?
A. 2.51 m/s B. 2.57 m/s C. 3.50 m/s D. 5.33 m/s E. 6.83 m/s
Induced electric and magnetic fields result in
A) electromagnetic waves. B) stronger electric or magnetic fields. C) higher voltages produced by Faraday induction. D) all of the above E) none of the above
A mass of 1.53 kg is attached to a spring and the system is undergoing simple harmonic oscillations with a frequency of 1.95 Hz and an amplitude of 7.50 cm
What is the speed of the mass when it is 3.00 cm from its equilibrium position? A) 0.0368 m/s B) 0.551 m/s C) 0.421 m/s D) 0.842 m/s E) 0.919 m/s