Glycerin, with a viscosity of 1.5 N ? s/m2, is flowing with an average speed of 1.2 m/s through a tube that has a radius of 5.0 mm and is 25 cm long. What is the drop in pressure over the length of this pipe?
A) 140 kPa
B) 46 kPa
C) 72 kPa
D) 76 kPa
E) 130 kPa
A
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The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.32 x 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4)
A) 6.27 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K
Projectile Motion: A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown, assuming negligible air resistance?
A. 6.1 m/s B. 7.4 m/s C. 8.1 m/s D. 8.9 m/s
In each of the processes described below, energy flows across the boundary of the object that serves as the subject of each sentence. Is this energy flow heat (A), work (B), or some other kind of energy transfer (E)?
(a) The sun emits light into space. (b) You get cooler when standing in the breeze from a fan. (c) Your car’s brakes get hot when used repeatedly. (d) Your hands get warm when you rub them together. (e) Your pizza gets warm in the microwave.
Bands in Uranus' atmosphere, similar to those seen on the other jovian planets,
A) form due to Uranus' rapid rotation. B) do not exist due to Uranus' large axial tilt. C) do not exist because Uranus is too small. D) are formed by interactions with Uranus' moons and rings. E) are driven by Uranus' internal energy source.