A woman drives 75 m to the east. She stops, asks directions, and then drives 75 m to north. What is the direction of the displacement with respect to east?
a. 30
b. 53
c. 0
d. 45
Answer: D. 45 deg from east
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Radiation: The cylindrical filament in a light bulb has a diameter of 0.050 mm, an emissivity of 1.0, and a temperature of 3000°C. How long should the filament be in order to radiate 60 W of power? (? = 5.67 × 10-8 W/m2 ? K4)
A. 11 cm B. 9.4 cm C. 8.6 cm D. 7.2 cm E. 5.9 cm
In a diffraction experiment, light of 600. nm wavelength produces a first-order maximum 0.350 mm from the central maximum on a distant screen. A second monochromatic source produces a third-order maximum 0
870 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?
The general formula 
is that of
a.
an amide.
b.
an alkyl halide.
c.
an alcohol.
d.
none of these
A 5-kg piece of lead (specific heat 0.03 cal/g×°C) having a temperature of 80°C is added to 500 g of water having a temperature of 20°C. What is the final equilibrium temperature (in °C) of the system?
a. 79 b. 26 c. 54 d. 34 e. 20