If an 800-N man hangs motionless from four vertical strands of rope, then the tension in each strand of rope is
1) 0 N
2) 200 N
3) 400 N
4) 800 N
which results in a net force on the man of
5) 0 N.
6) 200 N.
7) 400 N.
8) 800 N.
Answer: 2, 5
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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.
If the solubility of a compound is 72 grams per liter, how many grams of the compound will dissolve in 0.50 liters?
A) 36 g B) 72 g C) 144 g D) 30 g E) none of the above
Suppose that Hubble's constant were 11 km/s/million light-years instead of 22 km/s/million light-years. How would this graph look different?
A) The data would follow a much steeper, almost vertical line. B) The data would follow a more shallow line, closer to horizontal than the current line. C) The data would follow a flat, horizontal line. D) The graph would have to show luminosity on the vertical axis, rather than velocity.
A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest. Immediately after the collision, the 2.0-kg object has a velocity of 1.5 m/s directed 30° from its initial direction of motion. What is the x component of the velocity of the 1.0-kg object just after the collision?
A. 3.7 m/s B. 3.4 m/s C. 1.5 m/s D. 2.4 m/s E. 4.1 m/s