Ball bearings of 20% nickel steel, 10 cm spherical diameter, at 200ºC are quenched in 20ºC oil where the convective heat transfer coefficient is 200 W/m^2K. Determine a) the time for the surface to reach 80ºC, and b) the thermal energy exchanged during this time.
What will be an ideal response?
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Newton's law of gravitation applies to all ______________
Fill in the blank(s) with correct word
Marie & Pierre Curie
A) discovered radioactivity. B) proposed the plum-pudding model. C) proposed the tiny central nucleus idea. D) observed back-scattering from nuclei. E) discovered radium and polonium.
The Sun and the Moon have the same angular size. If the Sun is 400 times farther away from the Moon, the Sun must be ________ times the size of the Moon.
A. 400 B. 1/400 C. 4 D. 1/4 E. 4?
An ideal Polaroid will transmit 50% of nonpolarized incident light. How much light is transmitted by two ideal Polaroids oriented with their axes parallel to each other?
A) 0% B) 50% C) 100% D) between 0% and 50% E) between 50% and 100%