Initially, the light puck is moving west at 4 m/s while the heavy puck is moving south at 2 m/s. The final velocity of the conjoined pucks is
A. West.
B. South.
C. Southwest.
D. Zero.
E. Some other direction (explain).
C. Southwest.
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What happens to an electron's wave packet if an accurate velocity measurement is performed?
A) It suddenly changes to a new wave packet having a very small uncertainty in position, but a large uncertainty in velocity. B) It suddenly changes to a new wave packet having a very small uncertainty in velocity, but a large uncertainty in position. C) It suddenly changes to a new wave packet having small uncertainties in both velocity and position. D) Neither the wave packet nor the electron is affected by the measurement. E) The wave packet is unaffected by the measurement, even though the electron itself makes a sudden change of state that is caused by the measurement.
If we use the Doppler method to measure the period with which a star alternately moves toward and away from us due to an orbiting planet, then we also know the
A) orbital period of the planet. B) mass of the planet. C) distance to the star. D) radius of the planet.
Two point charges of + 30.0 ?C and - 9.00 ?C are separated by a distance of 20.0 cm. A +7.00 ?C charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges?
A) 0.453 N directed towards the negative charge B) 2.45 N directed towards the negative charge C) 2.45 N directed towards the positive charge D) 245 N directed towards the positive charge E) 245 N directed towards the negative charge
Which of the following is a cloud of vertical development?
A. cirrus B. cumulonimbus C. nimbostratus D. stratocumulus