A 0.10-m long metal rod has a radius of 1.0 cm and a resistance of 3.2 × 10^-5 W. What is the resistivity of the metal?
a. 5.0 × 10^-8 W×m
c. 10 × 10^-8 W×m
b. 160 × 10^-8 W×m
d. 1.6 × 10^-8 W×m
C
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A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the frequency for the applied alternating voltage?
A) 0.26 MHz B) 2.6 MHz C) 26 MHz D) 260 MHz E) 2600 MHz
A series LC circuit in a radio is in resonance with AM 1200 kHz. If the radio station is changed to AM 600 kHz, by what factor must the capacitance be multiplied to again achieve resonance?
a. 4 c. 1/2 b. 2 d. 1/4
Equilibrium: An athlete holds a 7.5-kg shot put in his hand with his lower arm horizontal, as shown in the figure. His lower arm has a mass of 2.8 kg and its center of gravity (or center of mass) is 12 cm from the elbow-joint pivot. How much force must the extensor muscle (which is
M in the figure) in the upper arm exert on the lower arm?
A. 100 N B. 500 N C. 1000 N D. 1500 N
The belts of Jupiter are best described as :
A) regions of downward moving material and low pressure. B) regions of upward moving material and low pressure. C) regions of upward moving material and high pressure. D) regions of downward moving material and high pressure. E) turbulent regions with no organized circulation pattern.