Rotational Kinetic Energy: A small ball is tied to one end of a light 2.5-m wire, and the other end of the wire is hooked to the ceiling. A person pulls the ball to the side until the wire makes an angle of 35° with the plane of the ceiling and then gently releases it. What is the angular speed of the ball, in rad/s, as it swings through its lowest point?
Fill in the blank(s) with the appropriate word(s).
1.8 rad/s
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If a helium-filled balloon is released on Earth, it rises. How would a helium-filled balloon move if it were released a few feet above the surface of the moon?
A) It would remain suspended at the point of release. B) It would rise. C) It would fall, but much more slowly than a rock dropped on the moon. D) It would turn into a giant pumpkin. E) It would fall at the same rate a rock falls when dropped on the moon.
Lenz's Law: As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field B is present directed to the right. The bar is moving upward with velocity of magnitude ?. What is the polarity of the induced emf in terminals X and Y?
A. X and Y are at the same potential. B. X is positive and Y is negative. C. Y is positive and X is negative.
A spring-powered dart gun is un-stretched and has a spring constant 16.0 N/m. The spring is compressed by 8.0 cm and a 5.0 gram projectile is placed in the gun. The kinetic energy of the projectile when it is shot from the gun is
A. 0.125 J. B. 0.090 J. C. 0.075 J. D. 0.051 J. E. 0.030 J.
Compare and contrast the structure of the Earth and the Moon
What will be an ideal response?