A 400-g piece of metal at 100°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C
What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup?
A)
1960 J/(kg?K)
B)
2830 J/(kg?K)
C)
3420 J/(kg?K)
D)
3780 J/(kg?K)
E)
4280 J/(kg?K)
A
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The most abundant rocks in Earth's crust are the
a. sulfides. b. oxides. c. carbonates. d. silicates.
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 4.0 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is
A. 0.980 
B. 3.92
C. 5.75
D. 6.86
E. 7.84
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
A. +2.0 J B. +20 J C. ?2.0 J D. ?20 J E. +40 J
The substance is entirely a gas between points ______________ and ______________
Reference: Ref 5-1