In the figure, if Q = 30 ?C, q = 5.0 ?C, and d = 30 cm, what is the magnitude of the electrostatic force on q?
A. 15 N
B. 23 N
C. zero
D. 7.5 N
E. 38 N
Answer: D
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The Doppler technique can be used to estimate the semimajor axis of a planet's orbit by
A) measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law. B) measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity. C) measuring the asymmetries in the velocity curve. D) measuring the amount by which the starlight is reduced when the planet transits.
In an AC series circuit the capacitive reactance is 217 ? and frequency is 56 Hz. What is the capacitance?
a. 2.62E–5 F b. 8.23E–5 F c. 1.31E–5 F d. 1.85E–5 F e. 3.71E–5 F
The minimum energy needed to produce a positron is
a. 3 MeV b. 2 MeV c. 1 MeV d. 4 MeV e. 0.51 MeV
Free Fall: A ball is thrown straight up with a speed of 36 m/s. How long does it take to return to its starting point, assuming negligible air resistance?
A. 3.7 s B. 7.3 s C. 11 s D. 15 s