A capacitor in an RC circuit is charged, storing energy 1.25 mJ. What is the time required to discharge this capacitor, as compared to the time required to discharge an identical capacitor in an identical RC circuit which has stored 2.5 mJ?
A. twice the time
B. half the time
C. the same time
D. the answer depends on the values of R and C.
C. the same time
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In thermal management or cooling of microchip modules for high-powered computer systems, very high heat fluxes have to be accommodated in the design of the cooling method. For many such cases, immersion cooling via pool boiling in a dielectric fluid is often employed [94]. In a pool boiling experiment to evaluate the cooling behavior from a simulated chip module, water is boiled at atmospheric pressure over a submerged emery-polished copper-plate heater. If the surface excess temperature is measured to be 14.5 K, what is the heat flux dissipated by boiling from the copper plate?
GIVEN
? Water at atmospheric pressure boiling on emery-polished copper-plate heater
? Surface excess temperature (?Tx)= 14.5 K
FIND
(a) Heat flux dissipated by boiling from copper plate.
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, the properties of water at 100°C are
A photon of wavelength 18.0 pm is scattered through an angle of 120° by a stationary electron. What is the wavelength of the scattered photon? (mel = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A) 19.2 pm B) 20.4 pm C) 21.6 pm D) 22.9 pm E) 24.1 pm
Interstellar extinction and the reddening of light by the interstellar medium (ISM) are both caused by _____
a. atoms and molecules in the ISM b. only atoms in the ISM c. only molecules in the ISM d. only dust in the ISM e. dust, atoms and molecules of the ISM
In the time between two closest approaches to Earth, Venus rotates almost exactly five times relative to the Sun. The consequence of this is that:
A) Earth always presents the same face to Venus at inferior conjunction. B) Venus always presents the same face to Earth at inferior conjunction. C) Venus presents the opposite hemisphere to Earth at each inferior conjunction. D) Venus presents the opposite hemisphere to Earth at each superior conjunction. E) Venus' rotation is completely unrelated to the distant Earth.