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
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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
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?
A) 485 kJ B) 395 kJ C) 273 kJ D) 147 kJ E) 14 kJ
In an elastic solid there is a direct proportionality between strain and:
a. elastic modulus. c. cross-sectional area. b. temperature. d. stress.
A two-slit apparatus is covered with a red (660 nm) filter. When white light is shone on the filter, on the screen beyond the two-slit apparatus, there are 9 interference minima within the 4.5 cm-wide central diffraction maximum. When a blue (440 nm) filter replaces the red, how many fringes will there be in the central diffraction maximum?
A. 3 B. 13 C. 9 D. 6