The wavelength from an FM station broadcasting at 93.9 megahertz on your radio is
a. 31.3 m.
b. 3.13 m.
c. 0.313 m.
d. 0.0313 m.
e. none of the above.
e
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Liquid crystal displays make use of
a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization
Buoyancy: A block of metal weighs 40 N in air and 30 N in water. What is the buoyant force on the block due to the water? The density of water is 1000 kg/m3.
A. 10 N B. 30 N C. 40 N D. 70 N
In a region of space where the magnetic field of the Earth has a magnitude of 80 ?T and is directed 30° below the horizontal, a 50-cm length of wire oriented horizontally along an east-west direction is moved horizontally to the south with a speed of 20 m/s. What is the magnitude of the induced potential difference between the ends of this wire?
A. 0.45 mV B. 0.35 mV C. 0.30 mV D. 0.40 mV E. 0.69 mV
Momentum: A 600-kg car makes a 90° turn. Its speed before the turn is 21.0 m/s and after the turn it is 24.0 m/s. What is the magnitude of the change in the car's momentum during the turn?
A. 19.1 × 103 kg?m/s B. 10.2 × 103 kg?m/s C. 9.55 × 103 kg?m/s D. 12.0 × 103 kg?m/s E. 22.2 × 103 kg?m/s