A skier leaves a ski jump with a horizontal velocity of 29.4 m/s. The instant before she lands three seconds later, the magnitudes of the horizontal and vertical components of her velocity are:
a. 0; 29.4 m/s.
b. 29.4 m/s; 0.
c. 29.4 m/s; 29.4 m/s.
d. 29.4 m/s; 41.6 m/s.
e. 41.6 m/s; 41.6 m/s.
c
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Free Fall: A toy rocket is launched vertically from ground level at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 81 m and acquired an upward velocity of 40 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The upward acceleration of the rocket during the burn phase is closest to
A. 9.9 m/s2. B. 9.6 m/s2. C. 9.3 m/s2. D. 9.0 m/s2. E. 8.7 m/s2.
From the viewpoint of an alien astronomer, how does Jupiter affect observations of our Sun?
A) It causes the Sun to move in a small ellipse with an orbital period of about 12 years. B) It makes the Sun periodically get somewhat brighter. C) It makes the Sun appear dimmer when viewed with infrared light. D) It causes the Sun to move in a small ellipse in the sky, with the same ellipse repeated every night.
When a mirror with a fixed beam on it is rotated through a certain angle, the reflected beam is rotated through an angle that is
A) equal to the angle of rotation. B) twice as large. C) four times as large. D) none of these
What is the primary effect the carbon dioxide in Venus' atmosphere has on the planet?
What will be an ideal response?