Refer to the figure above. Today's carbon dioxide concentration is about ________ that at any other time in the past 800,000 years.
A) 2 % higher than
B) 45% higher than
C) double
D) 400 times
B) 45% higher than
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Cubes of sugar, 1 cm on a side, are placed in water at 25ºC. Estimate the time before the lumps have dissolved; that is, when the sugar concentration at the lump is 10% by weight. Assume that the diffusivity of sugar into water is 6.9 x 10^-10m^2/s, the convective mass transfer coefficient is 6.4 x 10^-6m^2/s, and the self-diffusivity of sugar is 1 x 10^-5m^2/s. The density of sugar may be taken as 1500 kg/m^3.
What will be an ideal response?
Why do we experience night and day on Earth?
A) Earth rotates on its axis once every 24 hours. B) The Sun orbits Earth once every 24 hours. C) The Moon circles Earth once every 24 hours. D) The Sun moves around in a circle once every 24 hours, shining like a spotlight on Earth.
Two slides have the same height at the top, but one is short and steep while the other is a long gentle slope. If they can be considered frictionless, which will produce the largest speed at the bottom?
A. They produce the same speed at the bottom B. Depends on the mass of the person on the slide C. The steep slide D. The gradual slide
The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through the wall by what process?
a. conduction b. radiation c. convection d. vaporization