Planetary geologists now refer to the exterior of the newborn moon as__________
A) a multiringed basin
B) a micrometeorite
C) a magma ocean
D) coronae
C
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Suppose that a pipe carrying a hot fluid with an external temperature of Ti and outer radius ri is to be insulated with an insulation material of thermal conductivity k and outer radius ro. Show that if the convective heat transfer coefficient on the outside of the insulation is h and the environmental temperature is T?, the addition of insulation can actually increases the rate of heat loss if ro < k /h and that maximum heat loss occurs when ro = k/h . This radius, rc, is often called the critical radius.
GIVEN
An insulated pipe External temperature of the pipe = Ti Outer radius of the pipe = ri Outer radius of insulation = ro Thermal conductivity = k Ambient temperature = T? Convective heat transfer coefficient = h
FIND
Show that (a) The insulation can increase the heat loss if ro < k/h (b) Maximum heat loss occurs when ro = k/h
ASSUMPTIONS
The system has reached steady state The thermal conductivity does not vary appreciably with temperature Conduction occurs in the radial direction only
SKETCH
Why don't low-mass stars have the CNO cycle occurring in their cores?
A) They don't have enough carbon, nitrogen, and oxygen. B) The CNO cycle makes elements heavier than carbon, nitrogen, and oxygen. C) Their core temperatures are too low.
Explain the difference between radial and transverse velocities
What will be an ideal response?
A 3.0-m rod is pivoted about its left end. A force of 10 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m from the pivot. The 5.2-N force is at an angle of 30o to the rod and causes a cw torque. What is the net torque about the pivot? (Take ccw as positive.)
a. 18 N•m c. 4.2 N•m b. -18 N•m d. -4.2 N•m