Projectile Motion: A projectile is thrown upward at 24° with the vertical and returns to the horizontal ground 12.5 s later with no air drag.(a) How fast was it thrown?(b) How far from its original position did it land?(c) How high above its original position did it go?
What will be an ideal response?
(a) 67 m/s (b) 340 m (c) 190 m
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A 13.7-?F capacitor is connected to an AC source with an rms voltage of 148 V and a frequency of 40.0 Hz. What is the rms current in the capacitor?
a. 0.162 A b. 0.255 A c. 0.509 A d. 0.360 A e. 0.720 A
A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation. What is the acceleration of that point due to the spin of the wheel?
A) 0.050 m/s2 B) 1.4 m/s2 C) 48 m/s2 D) 200 m/s2 E) 0.00 m/s2
Given that Earth's actual distance from the Sun varies by less than 3% over the course of a year, why does the diagram look so elliptical?
A) It correctly shows that Earth is closest to the Sun at points A and C and farthest at points B and D. B) The elliptical shape is an effect of perspective, since the diagram shows an almost edge-on view of a nearly circular orbit. C) The shape of the diagram is meaningless and is done only for artistic effect.
Why are there no impact craters on the surface of Io?
A) Io is too small to have experienced many impacts. B) Jupiter's strong gravity prevents impacts from hitting Io. C) All of Io's impact craters have been buried by lava flows. D) Any impact craters that once existed on Io were eroded by winds and rain. E) Io formed only recently, long after the heavy bombardment ended.