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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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
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?