A Bunsen burner is used to heat a block of steel. The surfaces of the steel may be taken as 50ºC except on the bottom, where the burner is heating the block. Figure 2-64 shows the overall configuration of the heating process. Using graphical techniques, estimate the temperature profile through the block and the heat transfer through the block.
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Which of the following discoveries, if they existed, would necessitate a reevaluation of our ideas of stellar formation?
A) a cluster of stars that appeared to be 13 billion years old B) a 100-solar-mass star C) a 0.01-solar-mass star D) a molecular cloud without any stars E) planetary systems around other stars than our own
In terms of Jupiter masses, what is the range of brown dwarfs? What are objects above and below this range called?
What will be an ideal response?
A 2.0-cm length of wire centered on the origin carries a 20-A current directed in the positive y direction. Determine the magnetic field at the point x = 5.0 m on the x-axis
a. 1.6 nT in the negative z direction b. 1.6 nT in the positive z direction c. 2.4 nT in the negative z direction d. 2.4 nT in the negative z direction e. None of the above
A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same. c. decreases. b. increases. d. doubles every 4.0 seconds.