Not only does the central engine of active galaxies and quasars require a black hole, but also ________ to provide the radiative energy
A) a source of high-energy electrons for synchrotron radiation
B) globular clusters for food
C) a very strong magnetic field from neutron stars
D) a high rate of rotation for the black hole
E) an accretion disk of infalling matter
E
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This graph shows a gravitational wave signal recorded by the gravitational wave detectors (called LIGO) in two locations. What do models indicate was the cause of this signal?
A) the merger of two black holes in a distant galaxy B) a supernova in a distant galaxy C) the sudden explosion of an entire galaxy D) an x-ray burst on the surface of a neutron star
A 3.0-kg ball with an initial velocity of 
m/s collides with a wall and rebounds with a velocity of 
m/s. What is the impulse exerted on the ball by the wall?
A.
N
sB.
N
sC.
N
sD.
N
sE.
N
sA satellite engine has an exhaust speed of 2.80 × 10^4 m/s and ejects ionized gas at a rate of 2.50 × 10^–6 kg/s. What is the instantaneous thrust of the engine?
a. 8.93 × 10^–11 N b. 7.00 × 10^–2 N c. 5.30 × 10^2 N d. 1.12 × 10^10 N
Three cars (car F, car G, and car H) are moving with the same velocity when the driver suddenly slams on the brakes, locking the wheels. The most massive car is car F, the least massive is car H, and all three cars have identical tires
(a) Which car travels the longest distance to skid to a stop? A) Car F B) Car G C) Car H D) They all travel the same distance in stopping. (b) For which car does friction do the largest amount of work in stopping the car? A) Car F B) Car G C) Car H D) The amount of work done by friction is the same for all cars.