Velocity: A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average speed?
A. 2.5 m/s
B. 5.0 m/s
C. 10 m/s
D. 0 m/s
E. 1.3 m/s
Answer: B
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Two spheres, one with the center core up to r = R/2 hollow and the other solid, have the same mass M and same outer radius R. If they are both rolling at the same linear speed, which one has the greater kinetic energy?
a. The both have the same kinetic energy. b. The hollow one has the greater kinetic energy. c. The solid one has the greater kinetic energy. d. More information is needed to choose an answer.
Solenoid: When you double the number of windings in an ideal solenoid while keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will
A. double. B. triple. C. quadruple. D. be reduced by a factor of one-half. E. be reduced by a factor of one-fourth.
Briefly explain how we think quasars produce so much energy
What will be an ideal response?
For a particle in a finite box, which of the following is not true?
A. The energies are quantized for bound states. B. The bound-state wave functions at the walls do not have to be zero. C. The wave function can exist outside the walls. D. There is the same number of bound states in a finite box as in a box with infinite walls. E. None of these statements are true.