A 230000 V-rms powerline carries an average power Pavg = 250 MW a distance of 200 km. If the total resistance of the cables is 10 ohms, what is the resistive power loss?
a. 1.0 MW
b. 2.5 MW
c. 5.4 MW
d. 12 MW
e. 10 kW
d
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Indicate whether the statement is true or false
The frequency separating audible waves and ultrasonic waves is considered to be 15.0 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 225 m/s.)
a. 1.50 cm b. 33.8 cm c. 22.5 cm d. 33.8 cm e. 33.8 cm
Which of the following is a significant drawback for a flyby mission as compared to an orbiter to a distant world?
A) The flyby cannot have instruments as sophisticated as the orbiter. B) The flyby cannot get as close to the planet as the orbiter. C) The flyby cannot reach the planet as quickly as the orbiter. D) The flyby can study the planet for a much shorter time than the orbiter.
A thin hoop is supported in a vertical plane by a nail. What should the radius of the hoop be in order for it to have a period of oscillation of 1.00 s? The moment of inertia of a hoop of mass M and radius R about a point on its rim is 2MR2
A) 0.0154 m B) 0.0621 m C) 0.124 m D) 0.1876 m E) 0.248 m