Flux: A rectangular loop of wire that can rotate about an axis through its center is placed between the poles of a magnet in a magnetic field with a strength of 0.40 T, as shown in the figure. The length of the loop L is 0.16 m and its width w is 0.040 m. What is the magnetic flux through the loop when the plane of the loop makes an angle of 60° with the magnetic field?

A. 2.6 × 10-3 T ? m2 
B. 1.3 × 10-3 T ? m2 
C. 0 T ? m2 
D. 2.2 × 10-3 T ? m2 
E. 0.80 T ? m2 


Answer: D

Physics & Space Science

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The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1-m-wide and 1-m-tall. The fins are to be rectangular in cross section, 2.5-cm-long and 0.25-cm-thick. There are to be 100 fins per meter. The convective heat transfer coefficient, both for the wall and the fins, is estimated at 35 W/(m2 K). With this information, determine the per cent increase in the rate of heat transfer of the finned wall compared to the bare wall.

GIVEN
Aluminum fins with a rectangular cross section
Dimensions: 2.5-cm-long and 0.25-mm-thick
Number of fins per meter = 100

FIND
The per cent increase in the rate of heat transfer of the finned wall compared to the bare wall
ASSUMPTIONS
Steady state heat transfer
SKETCH

Physics & Space Science

The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900J/kg ? K. How much heat must be added to 500 g of aluminum originally at 27°C to completely melt it?

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Physics & Space Science

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Physics & Space Science

In an elastic solid there is a direct proportionality between strain and:

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Physics & Space Science