An athlete throws a ball with a velocity of 40 m/s at an angle of 20° above the horizontal. Which of the following statements is true in this case?
A) The vertical component of the velocity remains constant.
B) The horizontal component of the velocity changes.
C) The vertical component of the velocity changes sign after the ball attains its maximum height.
D) The horizontal component of the velocity changes sign after the ball attains its maximum height.
E) None of the given choices is correct.
C
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A) 4D B) 2D C) D D) D/2 E) D/4
The Kuiper Belt objects have orbits that:
A) carry them thousands of A.U. beyond the Sun. B) stay out just beyond Neptune and close to the ecliptic. C) stay sixty degrees ahead of or behind Jupiter. D) cross the orbit of Mars at perihelion. E) cross the orbit of Earth at perihelion.
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant frequency of 4.00 cycles per second, then the tangential velocity of a point on the circumference is
A. 1.25 m/s. B. 1.31 m/s. C. 1.51 m/s. D. 1.82 m/s. E. 2.00 m/s.