An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be
A) 10 m/s.
B) 20 m/s.
C) 30 m/s.
D) 40 m/s.
Answer: B
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Projectile Motion: A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground. At what angle below the horizontal does the ball approach the ground?
A. 35° B. 42° C. 48° D. 40° E. 65°
A heat map is an analytical tool that uses color to represent data.
Answer the following statement true (T) or false (F)
A conducting sphere of radius 20.0 cm carries an excess charge of +15.0 µC, and no other charges are present
(k = 1/4??0 = 8.99 × 109 N • m2/C2 ) The potential (relative to infinity) due to this sphere at a point 12.0 cm from its center is closest to A) zero. B) 674 kV. C) 1130 kV. D) 3380 kV. E) 9380 kV.
A diver can change her rate of rotation in the air by "tucking" her head in and bending her knees. Let's assume that when she is stretched out straight she is rotating at 1 revolution per second
Now she goes into the "tuck and bend," effectively shortening the length of her body by half. What will her rate of rotation be now?