Copper has
current carrying electrons per
A copper wire of radius 0.15 mm carries a current of 17 mA. What is the average drift velocity for the electrons?
A. 
B. 
C. 
D. more information is needed for this calculation
C.
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A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. In what direction must the boat be pointed in order to accomplish this?
A. 23° west of north B. 20° west of north C. 24° west of north D. 22° west of north E. 17° west of north
Two identical tiny balls of highly compressed matter are 1.50 m apart. When released in an orbiting space station, they accelerate toward each other at 2.00 cm/s2. What is the mass of each of them? (G = 6.67 × 10-11 N ? m2/kg2 )
What will be an ideal response?
A beam of light of wavelength 674 nm is incident along the normal to two closely spaced parallel glass plates. For what air gap separation between the plates will the transmitted beam be of maximum intensity? (1 nm = 10?9 m)
a. 169 nm b. 674 nm c. 337 nm d. 843 nm e. 506 nm
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 ?