How can we explain the presence of extrasolar planetary systems with Jovian-sized planets at distances at which we normally find terrestrial planets?
A) they are brown dwarfs that were captured by their parent stars
B) these are massive terrestrial planets that formed close to their parent stars
C) they are Jovian planets that were spun out from their rapidly spinning parent stars
D) the Jovian planets formed farther out and then migrated inward
D
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Assume that the inner cylinder in Problem 7.40 is a heat source consisting of an aluminum-clad rod of uranium, 5-cm-OD and 2-m-long. Estimate the heat flux that raises the temperature of the bismuth 40°C and the maximum center and surface temperatures necessary to transfer heat at this rate.
GIVEN
Liquid bismuth flowing through an annulus
Annulus inside diameter (Di) = 5 cm = 0.05 m
Annulus outside diameter (Do) = 6.1 cm = 0.061 m
Bismuth velocity (V) = 4.5 m/s
Bismuth temperature (Tb) = 316°C
Inner cylinder is an aluminum clad uranium heat source
Cylinder length (L) = 2 m
From Problem 7.40: c h
26,800 W/(m2 K)
FIND
(a) The heat flux (QG/At) necessary to raise the bismuth temperature 40°C, and
(b) The maximum center (Tu,o) and surface (Tu,ro) temperatures of the uranium
ASSUMPTIONS
Steady state
The Bismuth temperature given is the bulk Bismuth temperature
Thermal resistance of the aluminum is negligible
Thickness of the aluminum is negligible
SKETCH
Projectile Motion: James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. Compare the time it takes each to reach the lake below if there is no air resistance.
A. James reaches the surface of the lake first. B. John reaches the surface of the lake first. C. James and John will reach the surface of the lake at the same time. D. Cannot be determined without knowing the mass of both James and John. E. Cannot be determined without knowing the weight of both James and John.
Kim is in a spaceship moving past you at half the speed of light. Which of the following correctly describes how you will perceive each other's time?
A) You will say that Kim's time is running slow, and she will say that your time is running fast. B) You will say that Kim's time is running slow, and she will say that your time is running slow. C) You will say that Kim's time is running fast, and she will say that your time is running slow. D) You will both agree that time runs at the same rate for both of you.
How long is a wire made from 200 cm3 of copper if its resistance is 8.5 ohms? The resistivity of copper is 1.7 × 10^–5 W•m
a. 10 m c. 7.1 m b. 2.2 × 10^2 m d. 3.0 × 10^3 m