The magnetic fields carried by jets coming from active galactic nuclei are generated by:
A) the combined magnetic fields of the many stars near the galaxy's center.
B) the central black hole.
C) the movement of the interstellar matter of the galaxy.
D) the movement of the stars in the galaxy.
E) charged matter in the accretion disk of the central black hole.
E
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Radio telescopes are generally ________ than visible-light telescopes.
A) much larger B) much smaller C) much more expensive D) located at much higher altitudes
The difference between speed and velocity is that ________
A) velocity is calculated using a physics equation B) velocity is the same as acceleration but speed is different C) they are expressed in different units D) velocity also includes a direction
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 3.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 3.00 kg mass is (the initial velocity is zero)
A. 7.48 
B. 6.72
C. 2.98
D. 1.03
E. 0.00
Define the solar constant
What will be an ideal response?