One advantage of using air as the working fluid in a solar collector is ________
a. that freezing will not be a problem
b. that water heats up faster than air
c. a smaller storage facility can be used
d. that one needs hot water for showers
a
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The radio lobes of double-lobed radio sources are inflated by jets of excited gas emerging in two directions from the central galaxy
Indicate whether the statement is true or false
What is the arc length subtended by an angle of 30° on a circle of radius 10 cm?
What will be an ideal response?
The brightest stars in aging globular clusters will be
A) blue supergiants like Rigel and Deneb. B) massive blue main-sequence stars like Spica. C) blue stragglers. D) red supergiants like Betelgeuse and Antares. E) core stars of planetary nebulae.
A 320-g mass and a 400-g mass are attached to the two ends of a string that goes over a pulley with a radius of 8.70 cm. Because of friction, the pulley does not begin to rotate
What is the magnitude of the frictional torque on the bearing of the pulley if the system is in static equilibrium? A) 0.00683 Nm B) 0.614 Nm C) 0.0787 Nm D) 0.0626 Nm E) 0.000696 Nm