From Kepler's third law, a hypothetical planet that is twice as far from the Sun as Earth should have a period of
A) 1/2 Earth year.
B) more than 2 Earth years.
C) 1 Earth year.
D) 2 Earth years.
E) It depends on the planet's mass.
B
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Air at 30°C and 200 kPa is flowing in a 30-cm-diameter pipe and passes through the bend shown. An estimate of the pressure difference between the inside of the bend and the outside of the bend is approximately:
(A) 110 Pa
(B) 140 Pa
(C) 180 Pa
(D) 240 Pa
An object moves at a constant velocity of 12 m/s to the southwest for an interval of 20 s. Halfway through this interval, what is the magnitude of its instantaneous velocity?
a. It can be any value from 0 to 24 m/s. b. 6 m/s c. 12 m/s d. More information is needed.
What similarity did Isaac Newton perceive between a falling apple and the moon?
A) The velocities of both are directed toward Earth's center. B) Both have a velocities and accelerations directed toward Earth's center. C) Both have accelerations directed toward Earth's center, although the forces on them are in different directions. D) Both have forces on them toward Earth's center, and accelerations directed toward Earth's center. E) Both have forces on them toward Earth's center, but their accelerations are in different directions.
Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the following quantities?
a. velocity c. speed b. average velocity d. displacement