Due to the presence of ice crystals in nearly frozen liquid water, the density of water is
A) lower.
B) unaffected.
C) higher.
Answer: A
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Moment of Inertia: The L-shaped object shown in the figure consists of three small masses connected by extremely light rods. Assume that the masses shown are accurate to three significant figures. What is the moment of inertia of this object (a) about the x-axis, and (b) about the y-axis?
What will be an ideal response?
Why does convection occur in the troposphere, but not in the stratosphere?
A) The troposphere is warmer than the stratosphere. B) The troposphere is cooler than the stratosphere. C) Temperature decreases with altitude in the troposphere, but this trend reverses in the stratosphere. D) Density decreases with altitude in the troposphere, but this trend reverses in the stratosphere. E) The troposphere contains a smaller proportion of greenhouse gases than the stratosphere.
On the H-R diagram, white dwarfs Sirius B and Procyon B lie
A) at the top right. B) at the top left. C) at the lower left. D) at the lower right. E) close to the Sun, near the center.
A fluid at 40ºC flows at 8 m/s along a flat plate that is 3 m long. The plate is maintained at 100ºC. Determine the local convective heat transfer coefficient and the average convective heat transfer coefficient using 4 x 105 as the critical Reynolds number, for
a) Air at 100 kPa b) Water at 100 kPa