A wheel of diameter 0.70 m rolls on the floor without slipping. A point at the top of the wheel moves with a speed 2.0 m/s relative to the floor
(a) At what speed is the central axis of the wheel moving relative to the floor?
(b) What is the angular speed of the wheel?
(a) 1.0 m/s (b) 2.9 rad/s
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Two identical balls are thrown directly upward, ball A at speed v and ball B at speed 2v, and they feel no air resistance. Which statement about these balls is correct?
A) Ball B will go four times as high as ball A because it had four times the initial kinetic energy. B) Ball B will go twice as high as ball A because it had twice the initial speed. C) The balls will reach the same height because they have the same mass and the same acceleration. D) At their highest point, the acceleration of each ball is instantaneously equal to zero because they stop for an instant. E) At its highest point, ball B will have twice as much gravitational potential energy as ball A because it started out moving twice as fast.
The larger the diameter of a telescope, the more light it will collect
a. True b. False Indicate whether the statement is true or false
Projectile Motion: You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to
A. 28 m/s B. 20 m/s C. 40 m/s D. 37 m/s
A star is in an elliptical orbit around a black hole (which can't be seen). You have been observing the motion of the star through a telescope and have followed the motion long enough to establish that it is elliptical
How can you determine on which focus of the ellipse the black hole is located?