In an elastic collision between two bodies of mass m1 and m2, with m2 initially at rest, mass 1 moves off at angle q relative to the direction of its initial velocity and mass 2 at angle f. An exam paper shows the equations below: m1v1i 0 = m1v1f cosq + m2v2f sinf = m1v1f sinq + m2v2f cosf What error(s) has the student made?
a. In the first equation, m2v2f sinf should be m2v2f cosf.
b. In the second equation, m2v2f cosf should be m2v2f sinf.
c. In the second equation, the plus sign between the terms on the right should be a minus sign.
d. All of the errors listed above. e. Only errors (a) and (b) above.
D
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Consider the waves on a vibrating guitar string and the sound waves the guitar produces in the surrounding air. The string waves and the sound waves must have the same
A) wavelength. B) velocity. C) frequency. D) amplitude. E) More than one of the above is true.
A Boeing 737 airliner has a mass of 20,000 kg and the total area of both wings (top or bottom) is 100 m2 . What is the pressure difference between the top and bottom surface of each wing when the airplane is in flight at a constant altitude?
a. 1960 N/m2 b. 3920 N/m2 c. 7840 N/m2 d. 4560 N/m2 e. 3070 N/m2
Series/Parallel Circuits: Two resistors with resistances of 5.0 ? and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with this parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination. What is the current through (a) the 4.0-? resistor and (b) the 5.0-? resistor?
What will be an ideal response?
As the velocity of an inertial frame of reference increases with respect to a stationary observer, Einstein's theory of special relativity predicts that the length of an object, measured in the dimension parallel to the motion of the reference frame
, will A) decrease. B) remain unchanged. C) increase. D) increase at first but start to decrease when the speed of the reference frame equals half the speed of light. E) decrease at first but start to increase when the speed of the reference frame equals half the speed of light.