Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion that starts at this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which step does the entropy of the system increase?
a. 1
c. 3
b. 2
d. 4
A
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The density of ice is about 900 kg/m3, and the density of water is about 1000 kg/m3. A cubic block of ice one meter on a side floats in water. Assuming that the lowest square face of the cube is horizontal, the height of the block above the water line is
A. 0.2 m. B. 0.9 m. C. 0.5 m. D. 0.8 m. E. 0.1 m.
What effect does an increase in the mass of the virtual exchange particle have on the range of the force it mediates?
A) decreases it B) increases it C) has no appreciable effect D) decreases charged particle interactions and increases neutral particle interactions
The Hubble Space Telescope has been repaired
a. True b. False Indicate whether the statement is true or false
Why is continental crust lower in density than seafloor crust?
A) Continental crust is made of rock, while seafloor crust has more metals. B) Continental crust is made from volcanic rock called basalt, which is lower in density than what the seafloor crust is made from. C) Continental crust is made from remelted seafloor crust and therefore only the lower-density material rises to form it. D) Continental crust is actually denser than seafloor crust. E) Seafloor crust is more compact due to the weight of the oceans, but it is made of the same material as the continental crust.