Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building, and neither one experiences appreciable air resistance. Which statement about their accelerations is correct?
A) The acceleration of A is greater than the acceleration of B.
B) The acceleration of B is greater than the acceleration of A.
C) The two bricks have exactly the same acceleration.
D) Neither brick has any acceleration once it is released.
C
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Suppose that we connect two identical realistic batteries in parallel. The internal resistance of the combined set of batteries (considered as a unit) is
A. twice that of each individual battery. B. half that of each individual battery. C. the same as that of each individual battery.
100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)
All stars spend approximately the same amount of time on the main sequence
Indicate whether the statement is true or false
An important reason that sedimentary rocks are economical is that they are porous and permeable. Natural gas, for example, collects in the pore spaces between the sediment grains within these rocks. Porosity is the amount of space between the grains within a rock. It can be quantified as the total volume of space between grains divided by the volume of grains. A low porosity means that there is little space, and a high porosity means that there is a lot of space. -Permeability is how much the pore spaces are connected. Fluid flows through rocks that are more permeable.
The image below is an illustration of two different rocks. These images are magnified to show the individual grains (dark gray) and pore spaces (light gray) that make up the rock. Study these images and select the statement that describes the correct comparison of the porosity and permeability of these two rocks.
A.) Rock A has a lower porosity and a lower permeability than Rock B.
B.) Rock A has a higher porosity and a lower permeability than Rock B.
C.) Rock A has a lower porosity and a higher permeability than Rock B.
D.) Rock A has a higher porosity and a higher permeability than Rock B.