A player hits a tennis ball into the air with an initial velocity of 32 m/s at 35° from the vertical. How fast is the ball moving at the highest point in its trajectory if effects of air are negligible?
What will be an ideal response?
18 m/s
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Constant Acceleration Kinematics: A cart starts from rest and accelerates uniformly at 4.0 m/s2 for 5.0 s. It next maintains the velocity it has reached for 10 s. Then it slows down at a steady rate of 2.0 m/s2 for 4.0 s. What is the final speed of the car?
A. 20 m/s B. 16 m/s C. 12 m/s D. 10 m/s
A nonprismatic cantilever beam of one material is subjected to load P at its free end. Moment of inertia I2 5 2I1. The ratio r of the deflection ?B to the deflection ?1 at the free end of a prismatic cantilever with moment of inertia I1 carrying the same load is approximately:
(A) 0.25
(B) 0.40
(C) 0.56
(D) 0.78
A horizontal disk rotates about a vertical axis through its center. Point P is midway between the center and the rim of the disk, and point Q is on the rim
If the disk turns with constant angular velocity, which of the following statements about it are true? (There may be more than one correct choice.) A) P and Q have the same linear acceleration. B) Q is moving twice as fast as P. C) The linear acceleration of Q is twice as great as the linear acceleration of P. D) The linear acceleration of P is twice as great as the linear acceleration of Q. E) The angular velocity of Q is twice as great as the angular velocity of P.
When an atom emits radiation
A) an electron moves in precisely one complete orbit around the nucleus. B) a photon makes a quantum jump from one quantum state to another. C) an electron makes a quantum jump from one quantum state to another. D) a proton strikes a neutron to create a photon. E) it emits a small portion of its electric charge.