A source emits sound at a fixed constant frequency f.If the source moves away from you, and at the same time you run away from the source, the frequency you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.
c
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Resistance and Resistivity: A 1.0-mm diameter extension cord is made of metal having a resistivity of 1.68 × 10-8 ? ? m. When it carries a current of 15 A, what is the potential difference between two points in the cord that are 100 m apart?
A. 12 V B. 23 V C. 32 V D. 41 V
A proton moving with a speed of 3.20 × 10^5 m/s perpendicular to a uniform magnetic field of 0.0786 T will follow which of the paths described below? (qp = 1.60 × 10^?19 C and mp = 1.67 × 10^?27 kg)
a. a straight-line path b. a circular path of 4.25 cm radius c. a circular path of 10.9 cm radius d. a circular path of 1.52 cm radius e. a circular path of 54.1 cm radius
Mass on a Spring: A 0.30-kg block of wood is suspended on a spring. In equilibrium the wood stretches the spring 2.0 cm downward. The wood is then pulled an additional distance of 1.0 cm down and released from rest.(a) How long does it take the wood to make 3 complete cycles of vibration?(b) How much total mechanical energy does this system contain if we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging block?
What will be an ideal response?
What happens to a given volume of water when heated from 0°C to 4°C?
a. density increases b. density decreases c. density remains constant d. vaporizes