What happens during the apparent retrograde motion of a planet?
A) The planet appears to move eastward with respect to the stars over a period of many nights.
B) The planet moves through constellations that are not part of the zodiac.
C) The planet rises in the west and sets in the east.
D) The planet moves backward in its orbit around the Sun.
E) The planet moves backward through the sky.
A
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Projectile Motion: As shown in the figure, a heavy rock is shot upward from the edge of a vertical cliff. It leaves the edge of the cliff with an initial velocity of 15 m/s directed at 25° from the vertical and experiences no appreciable air resistance as it travels. How high is the cliff?
Fill in the blank(s) with the appropriate word(s).
The intricate patterns visible in an x-ray image of the Sun generally show
A) extremely hot plasma flowing along magnetic field lines. B) granulation on the photosphere. C) helioseismological fluctuations. D) structure within sunspots.
Starting from rest, a car accelerates down a straight road with constant acceleration a1 for a time t1, then the acceleration is changed to a different constant value a2 for an additional time t2 . The total elapsed time is t1 + t2 . Can the equations of kinematics be used to find the total distance traveled?
a. No, because this is not a case of constant acceleration. b. Yes, use (a1 + a2)/2 as the average acceleration and the total time in the calculation. c. Yes, use a1 + a2 as the acceleration and the average time (t1 + t2)/2 in the calculation. d. Yes, break the problem up into 2 problems, one with the conditions for the first time interval and the other with the conditions for the second time interval, noting that for the second time interval the initial velocity is that from the end of the first time interval. When done, add the distances from each of the time intervals.
A single conservative force Fx = (6.0x - 12) N (x is in m) acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of +20 J at x = 0 . What is the potential energy at x = 3.0 m?
a. +11 J b. +29 J c. +9.0 J d. -9.0 J e. +20 J