Which of the following accurately describes the density and temperature of molecular clouds compared to other interstellar clouds?
A) Molecular clouds are relatively low in both density and temperature.
B) Molecular clouds are relatively high in both density and temperature.
C) Molecular clouds are relatively high in density and low in temperature.
D) Molecular clouds are relatively low in density and high in temperature.
C) Molecular clouds are relatively high in density and low in temperature.
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Which requires the most amount of work by the brakes of a car?
A) slowing down from 100 km/h to 70 km/h B) slowing down from 70 km/h to a stop C) equal amounts for both
A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. A mass of 423 g is attached to the free end of the string
With the string vertical and taut, the mass is gently released so it can descend under the influence of gravity. As the mass descends, the string unwinds and causes the pulley to rotate, but does not slip on the pulley. What is the speed of the mass after it has fallen through 1.25 m? A) 2.00 m/s B) 2.28 m/s C) 1.97 m/s D) 3.94 m/s E) 4.95 m/s
A copper cable needs to carry a current of 200 A with a power loss of only 1.5 W/m. What is the required radius of the copper cable? (The resistivity of copper is 1.7 × 10^-8 W×m.)
a. 4.0 cm c. 0.85 cm b. 0.21 cm d. 1.2 cm
Recent work with type I supernovae at great distances suggests the universe may in fact be accelerating its expansion, a discovery attributed to a newly found:
A) repulsive charge on dark matter. B) polarization and a universal spinning magnetic field. C) dark energy. D) magnetic field associated with antimatter. E) mass determined for the neutrinos.