A very long string is tied to a rigid wall at one end while the other end is attached to a simple harmonic oscillator. Which of the following can be changed by changing the frequency of the oscillator?
A. The speed of the waves traveling along the string.
B. The tension in the string.
C. The wavelength of the waves on the string.
D. All of the above.
E. None of the above.
Answer: C
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A concave mirror has a focal length of 20 cm. What is the magnification if the object and image distances are 10 cm and -20 cm respectively?
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A teacher sends her students on a treasure hunt. She gives the following instructions:
1. Walk 300 m north 2. Walk 400 m northwest 3. Walk 700 m east-southeast and the treasure is buried there. As all the other students walk off following the instructions, Joe physics student quickly adds the displacements and walks in a straight line to find the treasure. How far and in what direction does Joe need to walk? A) 187 m in a direction 67.3° north of east B) 481 m in a direction 40.9° north of east C) 399 m in a direction 52.5° north of east D) 284 m in a direction 28.2° west of north E) The treasure position cannot be reached in one straight walk.
A current-carrying wire in a magnetic field
A) may be deflected. B) may experience a force. C) both of these D) neither of these
A charged particle moving perpendicular to a magnetic field has a magnet force on it. But when an observer moves with the particle, so that the particle has a relative velocity of zero with respect to the observer, one would expect there would be no magnetic force. Yet there is still a force. If it is not a magnetic force, then what is the source of this force?
a. It is an electrical force. b. It is due to the ether. c. It is a gravitational force. d. It is something other than any of the above.