Which of the following is true of double-lobed radio sources?
A) Their radio lobes are associated with interacting galaxies.
B) They are less active than normal galaxies.
C) Their nuclei are relatively cooler than their peripheries.
D) Their radio lobes are located at the end of their spiral arms.
A
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The region of a shadow that is totally shaded is known as the _____
A) umbra B) waxing crescent C) penumbra D) waxing gibbous
Energy balance in the Sun refers to a balance between
A) the rate at which fusion generates energy in the Sun's core and the rate at which the Sun's surface radiates energy into space. B) the mass that the Sun loses each second and the amount of mass converted into energy each second. C) the force of gravity pulling inward and the force due to pressure pushing outward. D) the amount of energy the Sun radiates into space and the amount of energy that reaches Earth.
4.00 moles of a monatomic ideal gas at a temperature of 340 K are compressed adiabatically from an initial volume of 70.0 L to a final volume of 30.0 L. What is the final pressure in the gas?
A) 663 kPa B) 581 kPa C) 106 kPa D) 42.1 MPa E) 2.17 MPa
A rock from a volcanic eruption is launched straight up. Which one of the following statements about this rock while it is in the air is correct if you neglect the presence of air?
A) On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero. B) On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero. C) Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration. D) The acceleration is downward at all points in the motion. E) The acceleration is downward at all points in the motion except that is zero at the highest point.