Hurricanes fit into which category below?
A) cyclones
B) anticyclones
C) gyres
D) cold fronts
Answer: A
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Mass on a Spring: An object of mass m = 8.0 kg is attached to an ideal spring and allowed to hang in the earth's gravitational field. The spring stretches 2.2 cm before it reaches its equilibrium position. If it were now allowed to oscillate by this spring, what would be its frequency?
A. 3.4 Hz B. 0.28 × 10-3 Hz C. 0.52 Hz D. 1.6 Hz
Suppose a planet is discovered by the Doppler technique and is then discovered to have transits. In that case, we can determine all the following about the planet except
A) its precise mass. B) its density. C) its physical size (radius). D) its rotation period. E) its orbital period.
The Doppler technique can be used to measure the eccentricity of a planet's orbit by
A) measuring the amount by which the starlight is reduced when the planet transits. B) measuring the asymmetries in the velocity curve. C) 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. D) 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.
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
a. 3.8 N/C b. 4.1 N/C c. 3.5 N/C d. 3.2 N/C e. 0.28 N/C