The Sun is gradually increasing in luminosity as it ages. It is 20% more luminous than it was when it was born. Why isn't this considered to be an explanation for global warming?
A) The scientists are covering up this potentially valid explanation.
B) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does.
C) The Sun is increasing in luminosity much too slowly, over many millions of years.
D) What the Sun was doing millions of years ago is what determines Earth's temperature, since the Earth doesn't respond directly to what the Sun is doing today.
C
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If the sum of both the external torques and the external forces on an object is zero, then the object must be at rest
A) True B) False
The torque due to the frictional resistance of the oil film between a rotating shaft and its bearing is found to be dependent on the force F normal to the shaft, the speed of rotation N of the shaft, the dynamic viscosity ? of the oil, and the shaft diameter D. Establish a correlation among the variables by using dimensional analysis.
GIVEN The oil film between a rotating shaft and its bearing The torque (T) due to frictional resistance is a function of normal force (F), speed of rotation (N), dynamic viscosity (?), and shaft diameter (D) FIND A correlation among the variables ASSUMPTIONS Steady state
Comets with orbits that take them through the inner solar system shed sand- to pebble-size particles that then follow the comet around its orbit. How do these particles affect Earth?
A) They are the particles that produce meteor showers. B) They are the particles that produce the lights of auroras. C) They have been implicated in mass extinctions, including the extinction of the dinosaurs. D) On rare occasions, they can blanket our entire atmosphere with dust.
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the wavelength of the light is increased,
a. the pattern shrinks in size. (central maximum less wide; other maxima in closer to it) b. the pattern increases in size. (central maximum wider; other maxima farther from it) c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.