A heat conducting rod, 0.90 m long, is made of an aluminum section that is 0.10 m long, and a copper section that is 0.80 m long. Both sections have cross-sectional areas of 0.00040 m2
The aluminum end is maintained at a temperature of 40°C and the copper end is at 150°. The thermal conductivity of aluminum is 205 W/m?K and of copper is 385 W/m?K. Steady state has been reached, and no heat is lost through the well-insulated sides of the rod. The temperature of the aluminum-copper junction in the rod is closest to A) 61°C.
B) 58°C.
C) 56°C.
D) 54°C.
E) 52°C.
A
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The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos[(3.25 m-1)x – (7.22 s-1)t]. What is the wavelength of the wave?
A) 3.25 m B) 1.93 m C) 0.870 m D) 0.308 m E) 0.139 m
The figure shows the Sun and pairs of sunspots. One could say that there is really a 22-year sunspot cycle because
Rapid change of a magnetic field induces
A) a magnetic field of greater magnitude. B) a magnetic field of the same magnitude. C) an electric field.
A 320-g ball and a 400-g ball are attached to the two ends of a string that goes over a pulley with a radius of 8.7 cm. Because of friction in its axle, the pulley does not begin to rotate
What is the magnitude of the frictional torque at the axle of the pulley if the system remains at rest when the balls are released? A) 0.068 N ? m B) 0.61 N ? m C) 0.079 N ? m D) 0.063 N ? m E) 0.00070 N ? m