If an observer walks north toward increasing latitude, the number of circumpolar stars would
a. remain constant.
b. decrease.
c. increase.
d. Unknown unless you also state the longitude of the observer.
C
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Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.You drop the box. As it falls to its original level, its kinetic energy is
a. 0 b. 4 J. c. 100 J. d. none of the above.
An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, and inductor, or a capacitor
At time t = 0 the voltage is zero. At time t = T/4 the current in the unknown element is equal to zero, and at time t = T/2 the current is I = -Imax, where Imax is the current amplitude. What is the unknown element? A) a resistor B) an inductor C) a capacitor D) an inductor or a capacitor
In a composite material the _____________phase is continuous and is responsible for holding the composite material together.
Fill in the blank(s) with the appropriate word(s).
What is not part of the radial velocity method?
A: A star moving a little towards and a little away from us B: A planet passing in front of its host star C: A star making a small orbit because of the planet's influence D: A detected redshift from a star E: A detected blueshift from a star