To transmit power over great distances, why is HIGH VOLTAGE chosen for long distance power lines?
What will be an ideal response?
Power losses in the line go as I2r (r being the wire resistance). By increasing the voltage, the current can be reduced, thereby greatly reducing losses.
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A gas is quickly compressed in an isolated environment. During the event, the gas exchanged no heat with its surroundings. This process is
A) isothermal. B) isometric. C) isobaric. D) adiabatic.
A zoom lens for a camera is adjusted to change its focal length from 38 mm to 304 mm. If the same amount of light is to be admitted to the lens in both cases, what is the final f-number if the original f-number was f/2.0?
What will be an ideal response?
Uranus completes one revolution about its own axis every 17.24 hours. What is the radius of the orbit required for a satellite to revolve about Uranus with the same period? Uranus has a mass of 8.69 × 1025 kg and G = 6.67 x 10-11 N•m2/kg2
A) 8.27 × 107 m B) 3.41 × 108 m C) 2.56 × 108 m D) 9.03 × 107 m E) 1.04 × 107 m
The volume of water that flows past a given point in a channel during a specified time is called
A) load. B) gradient. C) discharge. D) runoff.