What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?
What will be an ideal response?
All active galaxies and quasars emit massive quantities of radio- and infrared-wavelength energy in a non-blackbody spectrum from a very small (solar-system-sized) source. This can be understood if they are powered by the energy produced when matter falls into a supermassive black hole.
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If you went to Mars, would you have to wear a space suit? Explain why or why not
What will be an ideal response?
Current: How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?
A. 20 C B. 2.0 C C. 5.0 C D. 0.050 C
A disk (radius = 8.0 cm) that rotates about a fixed axis starts from rest and accelerates at a constant rate to an angular velocity of 4.0 rad/s in 2.0 s. What is the magnitude of the total linear acceleration of a point on the rim of the disk at the instant when the angular velocity of the disk is 1.5 rad/s?
a. 24 cm/s2 b. 16 cm/s2 c. 18 cm/s2 d. 34 cm/s2 e. 44 cm/s2
The number 0.03 has how many significant figures?
a. 2 b. 3 c. 5 d. 6 e. 7