What is the cause of the lobes in a double-lobed radio galaxy?
What will be an ideal response?
Jets from a central black hole eject large bubbles of hot gas. The hot gas glows in the radio band.
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What is "seeing"?
A) a measure of the quality of the telescope's optics B) a measure of the transparency of the scope's objective lens C) a measurement of the sharpness of vision of the astronomer's eyes D) a measurement of the image quality due to air stability E) a measurement of clarity and absence of clouds
A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
A. 1.8 m/s2 up the incline B. 2.3 m/s2 up the incline C. 6.6 m/s2 down the incline D. 1.8 m/s2 down the incline E. 2.3 m/s2 down the incline
A long wire carrying a 2.0-A current is placed along the y axis. What is the magnitude of the magnetic field at a point 0.60 m along the x-axis?
A) 6.7 × 10-7 T B) 13 × 10-7 T C) 1.2 × 10-7 T D) 6.7 T E) 12 T
Because of time dilation, if a twin goes on a trip in a high speed rocket ship, when she returns home she will be younger than her twin sister who did not go on the trip
Indicate whether the statement is true or false