If the polar ice decreases, what would happen, and why?
A) cooling, because melted ice cools things off B) warming, because more sunlight is reflected
C) cooling, because more sunlight is reflected D) warming, because more sunlight is absorbed
D
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Velocity: A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average velocity?
A. 0.00 km/h B. 0.067 km/h C. 4.0 km/h D. 5.3 km/h
The acceleration due to gravity at the surface of Planet X is 10 m/s2 . What is the acceleration due to gravity at an altitude of 4000 km above the surface of this planet?
a. 10 m/s2 c. 4.4 m/s2 b. 8.0 m/s2 d. More information is needed.
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion from 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 steps does the internal energy of the system increase?
a. 1 and 2 c. 1 and 3 b. 3 and 4 d. 2 and 4
The electric potential at the surface of a charged conductor
a. is always zero. b. is always independent of the magnitude of the charge on the surface. c. may be set equal to zero by adding an appropriate constant to the potential at all points of space. d. is always such that the potential is zero at all points inside the conductor. e. is always such that the potential is always zero within a hollow space inside the conductor.