Give two reasons why summer days are warmer than winter days
What will be an ideal response?
The Earth's hemisphere that is tilted towards the Sun experiences summer, which means the solar radiation hits this part of the Earth more directly than in winter. Also, the days are longer, so the hemisphere experiencing summer receives sunlight for more hours in a day than in the winter.
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For a particular process where a fluid is being heated in a 2 inch (5.08 cm) diameter tube, the Nusselt number is predicted to be 45. If the fluid has a thermal conductivity of 1.5 Btu/hr·ft·ºF (2.6 W/mK) what is the predicted convective heat transfer coefficient?
What will be an ideal response?
Impedance: A 100-? resistor is connected in series with a 10.0-mH inductor across an ac source operating at 1.00 kHz. What is the impedance of this circuit?
A. 100 ? B. 118 ? C. 200 ? D. 236 ? E. 1000 ?
Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
A. 41 J B. 16 J C. 64 J D. 10 J E. 80 J
A laser beam emits
photons per second with a wavelength of 663 nm. What is the power output of this laser?
A. 51 mW B. 67 mW C. 51 W D. 75 W E. 93 W