الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Lectures in General Physics
across the ends of the rod, there is a current of 2.00 10 -3 A in the rod. Find
(a) the resistance of the rod and (b) the rod's length.
a. (a) 1.05 k; (b) 998 mm
b. (a) 9.50 k; (b) 111 mm
c. (a) 9.50 k; (b) 814 mm
d. (a) 1.05 k; (b) 902 mm
[19] A copper cable is designed to carry a current of 500 A with a power loss
of 1.00 W/m. What is the required radius of this cable?
a. 3.68 cm
b. 6.76 cm
c. 13.5 cm
d. 7.36 cm
[20] In a certain stereo system, each speaker has a resistance of 6.00 Q. The
system is rated at 50.0 W in each channel, and each speaker circuit includes
a fuse rated at 2.00 A. Is the system adequately protected against overload?
a. yes
b. no
c. n/a
d. n/a
[21] Compute the cost per day of operating a lamp that draws 1.70 A from a
110 V line if the cost of electrical energy is $0.06kWh.
a. 0.458 cents/day
b. 45.8 cents/day
c. 1.12 cents/day
d. 26.9 cents/day
[22] Calculate the power dissipated in each resistor of the circuit of Figure 5.
Dr. Hazem Falah Sakeek 225