A series circuit has a resistance of 4.0 ?, a reactance (due to the capacitance) of 21.0 ?, and a reactance (due to the inductance) of 17.0 ?. Find the impedance of the circuit
A) 42 ? B) 8.0 ? C) 27 ? D) 5.7 ?
D
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An object moves in a direction parallel to its length with a velocity that approaches the velocity of light. The width of this object as measured by a stationary observer
A) does not change. B) approaches infinity. C) approaches zero. D) increases slightly. E) approaches "gamma".
Two objects are thrown vertically upwards simultaneously, one on the surface of Earth and the other on the surface of the Moon. Both have an initial velocity of 20 m/s
Both objects will take the same time to reach the highest point of their trajectory. Indicate whether the statement is true or false
Consider two mercury barometers, one with twice the cross-section area of the other. Mercury in the wider tube will rise
A) to the same height as in the narrow tube. B) twice as high as mercury in the narrow tube. C) four times as high as mercury in the narrow tube. D) more than four times as high as in the narrow tube. E) none of the above
A vertical wire carries a current straight up in a region where the magnetic field vector points due north. What is the direction of the resulting force on this current?
A) down B) north C) south D) east E) west