Most interstellar clouds remain stable in size because the force of gravity is opposed by ________ within the cloud.
A) thermal pressure
B) degeneracy pressure
C) radiation pressure
D) stellar winds
A) thermal pressure
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A two-shell-eight-tube-pass heat exchanger is used as an economizer by heating a 1000 l/min 10ºC stream of water with another 1000 l/min stream of 75ºC water. If the NTU value for the economizer is 0.45, what are the outlet temperatures of the two streams of water?
What will be an ideal response?
Satellite Motion: Asteroid Ida was photographed by the Galileo spacecraft in 1993, and the photograph revealed that the asteroid has a small moon, which has been named Dactyl. From the dimensions of Ida and its general features, one can estimate the mass of Ida to be 4.5 × 1016 kg, and the distance between Dactyl and Ida is approximately 90 km. Assuming a circular orbit, what would be the orbital speed of Dactyl? (G = 6.67 × 10-11 N ? m2/kg2)
A. 5.8 m/s B. 11 m/s C. 2.3 m/s D. 2.9 m/s E. 30 m/s
An object is moving in a circular path with an angular speed of 1.52 rad/s. How long does it take the object to complete one revolution?
A) 4.13 s B) 2.07 s C) 118 s D) 4.77 s E) 8.26 s
A parallel-plate capacitor, with air between the plates, is connected across a voltage source. This source establishes a potential difference between the plates by placing charge of magnitude 4.15 × 10-6 C on each plate
The space between the plates is then filled with a dielectric material, with a dielectric constant of 7.74. What must the magnitude of the charge on each capacitor plate now be, to produce the same potential difference between the plates as before?