The figure shows the equation of time; notice that the vertical axis shows "apparent solar time minus means solar time." Suppose the date is about Feb. 15 and you have a digital watch that is set to the local mean solar time. If the watch say sit is precisely noon, then
A) the Sun will reach your meridian in about 15 minutes.
B) the Sun is now crossing your meridian.
C) the Sun crossed your meridian about 15 minutes ago.
D) the Sun is now at its highest point in your sky.
A) the Sun will reach your meridian in about 15 minutes.
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A resistor and an ideal inductor are connected in series to an ideal battery having a constant terminal voltage V0. At the moment contact is made with the battery,
(a) the voltage across the resistor is A) V0. B) V0/e. C) V0/2. D) zero. (b) the voltage across the inductor is A) V0. B) V0/e. C) V0/2. D) zero.
The stimulated emission of photons from the excited atoms in a gas laser is prompted by which of the following?
a. nearby presence of photons of same wavelength as those emitted b. high flux of electrons c. high voltage d. high temperature
Part of the current atmosphere of Earth is believed to be
a. the remnants of the original hydrogen and helium gas from the solar nebula attracted by the protoplanet. b. the result of the melting and vaporizing of the glaciers from the last ice age. c. composed primarily of hydrogen and helium. d. composed of gases that were outgassed from the heated rocks sometime after the planet formed. e. the result of a collision between the sun and another star.
As a parcel of air is swept upward, with no heat input or output, its temperature
A) increases. B) decreases. C) remains the same.