Optical fibers work because of __________
Fill in the blank(s) with correct word
total internal reflection
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Determine the number of boundary and initial conditions needed to solve the differential equation.
A large spring requires a force of 130 N to compress it only 0.01 m. What is the spring constant of the spring?
a. 13 N/m b. 13 000 N/m c. 1.3 N/m d. 130 N/m e. 6 500 N/m
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat of combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the Carnot efficiency? (c) How much thermal energy is exhausted each day?
Which of the following statements is currently believed to be true?
a. Electricity is caused by magnetic current loops at the atomic level. b. Magnetism is caused by electric current loops at the atomic level. c. All electric fields are produced by moving magnetic poles. d. Stationary electric charges produce magnetic fields. e. Steady magnetic fields create electric fields.