Which of statement below about black holes is not true?
A) Although we are not 100% certain that black holes exist, we have strong observational evidence in favor of their existence.
B) If you watch someone else fall into a black hole, you will never see him (or her) cross the event horizon; you'll only see him fade from view as the light he emits or reflects becomes more and more redshifted.
C) A spaceship passing near a 10-solar-mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10-solar-mass main-sequence star.
D) If you fell into a black hole, you would experience time to be running normally as you plunged rapidly across the event horizon.
C
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A myopic (nearsighted) child wears contact lenses that allow her to have clear distant vision. The power of the lenses of her eyeglasses is -3.00 diopters. Without the corrective lenses, what is the far point of the girl?
A) 0.33 m B) 0.25 m C) 0.17 m D) 0.42 m E) 0.50 m
A well-clothed person walks into a large auditorium that is empty. If the auditorium walls are at an average temperature of 55ºF and the average surface temperature of the person’s clothes is 85ºF, estimate the net radiation heat transfer between the person and the auditorium walls. An average person can be assumed to have a surface area of 19.4 ft^2 (1.8 m2^).
What will be an ideal response?
Consider a system consisting of two Einstein solids P and Q in thermal contact. Assume that we know the number of atoms in each solid and ?. What do we know about the system if we also know the total energy in each of the two objects?
A. Its macrostate B. Its microstate C. Its macropartition D. Its microstate and macropartition E. Its macrostate and macropartition F. Its macrostate and microstate T. Its macrostate, microstate, and macropartition
Young's Modulus: A bridge piling has a cross-sectional area of 1.250 m2 and supports a load of 1875 N. What is the stress on the column?
A. 1875 N B. 1875 N/m2 C. 1500 N/m2 D. 2344 N/m2