A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are positive, its angular velocity is positive, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down.
b. rotating counterclockwise and slowing down.
c. rotating clockwise and speeding up.
d. rotating counterclockwise and speeding up.
e. first rotating clockwise and then counterclockwise.
B
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Of all the active galactic nuclei, the ________ is the most energetic
A) quasar B) giant elliptical C) radio lobe galaxy D) blazar E) Seyfert
The escape velocity needed for an atom in the atmosphere of a planet to escape the gravitational pull of the planet is larger if:
A. the temperature of the gas in the atmosphere is higher B. the mass of the atom is smaller C. the radius of the planet is larger D. the planet is farther from the Sun E. the mass of the planet is larger
A sample of ideal monatomic gas is cooled by 50.0°C at constant volume by removing 831 J of energy from it. How many moles of gas are in the sample? (R = 8.31 J/mol ? K)
A) 2.50 mol B) 1.50 mol C) 1.33 mol D) 1.00 mol
What information do we know about the known exoplanets?
A) estimates of orbits and masses B) complete composition C) precise masses D) All of the above E) None of the above