Velocity: An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?
A. 260 mi/h
B. 270 mi/h
C. 275 mi/h
D. 280 mi/h
Answer: B
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What key event marks the transition of a protostar into a true (main-sequence) star?
A) the onset of sustained nuclear fusion in its core B) the clearing of the gas from the surrounding gas cloud into interstellar space C) the moment when the luminosity first matches the luminosity of the lowest-mass main sequence stars D) the onset of a strong stellar wind
The force of gravity is the only one of the four forces felt on large size scales. Which of the following best explains why the other forces don't play a major role on large scales?
A) The strong and weak forces act only on small scales, and large objects tend to be electrically neutral and therefore don't feel an electromagnetic force. B) The other three forces are all short in range, and cannot be felt over large distances. C) Gravity is by far the strongest force, so it simply dominates on large size scales. D) Effects of the strong and weak forces tend to cancel out effects of the electromagnetic force on large scales.
The hole for a bolt in a brass plate has a diameter of 1.200 cm at 20°C. What is the diameter of the hole when the plate is heated to 220°C? The coefficient of linear thermal expansion for brass is 19 × 10-6/°C
(Express your answer to 4 significant figures.) A) 1.205 cm B) 1.125 cm C) 1.195 cm D) 1.200 cm E) 1.210 cm
A nonuniform 2.0-kg rod is 2.0 m long. The rod is mounted to rotate freely about a horizontal axis perpendicular to the rod that passes through one end of the rod. The moment of inertia of the rod about this axis is 4.0 kg/m2 . The center of mass of the rod is 1.2 m from the axis. If the rod is released from rest in the horizontal position, what is its angular speed as it swings through the
vertical position? a. 3.4 rad/s b. 4.4 rad/s c. 4.3 rad/s d. 5.8 rad/s e. 6.8 rad/s