When we are lucky enough to see an extra-solar planet transit its star,
A) it will cause the star to vanish for several hours.
B) we can find the planet's size, mass, and density by the drop in light.
C) we can determine what elements are in its atmosphere.
D) we can determine its shape.
E) we can be certain it is a terrestrial, not a jovian.
B
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A step-up transformer that doubles the input voltage is designed to work with an input voltage that varies at 60 Hz. The frequency with which the output voltage varies is ________ Hz.
Fill in the blank(s) with the appropriate word(s).
What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?
A) 2.1 × 107 N/C B) 2.4 × 106 N/C C) 4.5 × 106 N/C D) 6.4 × 106 N/C
Which of the following operations will not change a vector?
A) Translate it parallel to itself. B) Rotate it. C) Multiply it by a constant factor. D) Add a constant vector to it. E) Subtract a constant vector from it.
Forms of potential energy include
A. Kinetic and thermal B. Gravitational and elastic C. Kinetic and gravitational D. Thermal and elastic