Suppose the velocity of waves on a particular rope under a tension of 100 N is 12 m/s. If the tension is decreased to 25 N what will be the new velocity of waves on the rope?
A. 18 m/s.
B. 12 m/s.
C. 6 m/s.
D. 24 m/s.
E. 48 m/s.
Answer: C
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Electric Field of Point-Charges: The figure shows two unequal charges, +q and -Q. Charge -Q has greater magnitude than charge +q. Point X is midway between the charges. In what section of the line will there be a point where the resultant electric field is zero?
A. VW B. WX C. XY D. YZ
Why does light come in different colors?
a) differences in the wavelength b) it travels at different speeds c) warping of space it travels through d) differences in intensity of radiation e) bending of light in space
A small car has a head-on collision with a large truck. Which of the following statements concerning the magnitude of the average force due to the collision is correct?
A) The truck experiences the greater average force. B) The small car experiences the greater average force. C) The small car and the truck experience the same average force. D) It is impossible to tell since the masses are not given. E) It is impossible to tell since the velocities are not given.
A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling towards the factory at 30 m/s? The speed of sound in air is 343 m/s
A) 83 Hz B) 85 Hz C) 87 Hz D) 89 Hz E) 91 Hz