Which type of force would be the equal and opposite force to a gravitational force?
A. gravitational
B. electromagnetic
C. strong
D. weak
E. It could be any one of the above or some combination of them.
Answer: A
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2.00 moles of an ideal gas freely expands from 1.50 liters to 4.00 liters. The change in entropy in the expansion
A. 5.80 J/K B. 8.50 J/K C. 16.3 J/K D. 18.7 J/K
A pilot drops a bomb from a plane flying horizontally at a constant speed. When the bomb hits the ground, the horizontal location of the plane will
A) be in front of the bomb. B) be over the bomb. C) be behind the bomb.
A runner maintains constant acceleration after starting from rest as she runs a distance of 60.0 m. The runner's speed at the end of the 60.0 m is 9.0 m/s. How much time did it take the runner to complete the 60.0 m distance?
A) 6.67 s B) 15.0 s C) 9.80 s D) 10.2 s E) 13.3 s
Calorimetry: A 90-g aluminum calorimeter contains 390 g of water at an equilibrium temperature of 20°C. A 160-g piece of metal, initially at 305°C, is added to the calorimeter. The final temperature at equilibrium is 32°C. Assume there is no external heat exchange. The specific heat capacities of aluminum and water are 910 J/kg ? K (aluminum) and 4190 J/kg ? K (water). What is the specific heat capacity of the 160-g piece of metal?
A. 470 J/kg ? K B. 430 J/kg ? K C. 350 J/kg ? K D. 310 J/kg ? K E. 510 J/kg ? K