Including relativistic effects, doubling the speed of a object:
a. doubles its momentum.
b. more than doubles its momentum.
c. less than doubles its momentum.
d. has no effect on its momentum.
b
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On average, elliptical galaxies are richer star forming regions than spirals
Indicate whether the statement is true or false
What is the specific 3-step energy generating process in the Sun called?
A. the proton-proton chain B. radiative transfer C. hydrostatic equilibrium D. thermography
The nucleus of a comet is typically
A) a few hundred kilometers across, and bright, shiny white from its ices. B) a few meters in diameter. C) located between the orbits of Mars and Jupiter. D) a few kilometers in size, and very low in density. E) very durable, made of iron.
Compare the axial heat flux achievable by a heat pipe using water as the working fluid with that of a solid silver rod. Assume that both are 20-cm-long, that the temperature difference for the rod from end to end is 100°C and that the heat pipe operates at atmospheric pressure. State your other assumptions.
GIVEN ? Silver rod and a heat pipe, both 20-cm-long ? End-to-end temperature difference of 100°C ? Heat pipe operates at atmospheric pressure FIND (a) Axial heat flux for both rods ASSUMPTIONS ? Neglect heat pipe vapor pressure drop ? Horizontal operation for the heat pipe ? Perfect wetting of the heat pipe fluid, ? ?= 0 PROPERTIES AND CONSTANTS From Appendix 2, Table 12, the conductivity for silver at 63°C is ksilver = 424 W/(mK)