A wire along the z-axis carries a current of 6.8 A in the +z direction. Find the magnitude and direction of the force exerted on a 6.1-cm long length of the wire by a uniform magnetic field with magnitude 0.36 T in the -x direction
What will be an ideal response?
0.15 N, -y direction
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A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the atmosphere from outer space. If its original temperature is 38°C, the effective average temperature of the atmosphere is 1093°C, and the effective heat transfer coefficient is 115 W/(m2 °C), estimate the temperature of the shell after reentry, assuming the time of reentry is 10 min and the interior of the shell is evacuated.
GIVEN
• A spherical stainless steel satellite reentering the atmosphere
• Outside diameter (D) = 3 m
• Wall thickness (L) = 1.25 cm = 0.0125 m
• Its original temperature (To) = 38°C
• The effective temperature of the atmosphere (T?) = 1093°C
• The effective heat transfer coefficient ch = 115 W/(m2 °C)
• The time of reentry (tr) = 10 min = 600 s
• The interior of the shell is evacuated
FIND
• The temperature of the shell after reentry (Tf)
ASSUMPTIONS
• Exterior heat transfer is uniform over the shell
• Assume radiation heat transfer is allowed for in the heat transfer coefficient
SKETCH
Doubling the wavelength of a photon would ______________ its energy
a. halve b. double c. quadruple d. not change
If seafloor spreading creates new lithosphere, does the size of Earth change?
A) Yes, Earth is getting larger. B) No, the extra crust is crumpled up to form mountains. C) No, older crust is recycled back into the asthenosphere. D) Yes, the Earth is shrinking because it is cooling.
Even if the Universe has no edge, it has a center
a. True b. False Indicate whether the statement is true or false