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

Physics & Space Science

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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

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Which of the following is a significant drawback for a flyby mission as compared to an orbiter to a distant world?

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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

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