A camper is about to drink his morning coffee. He pours 400 grams of coffee, initially at 75.0°C into a 250-g aluminum cup, initially at 16.0°C
What is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? The specific heat of aluminum is 900J/(kg?K). Assume that the specific heat of coffee is the same as the specific heat of water. A) 45.5°C
B) 62.0°C
C) 65.0°C
D) 68.0°C
E) 71.0°C
D
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Indicate whether the statement is true false.
Which of the following provides the minimum amount of protection you need to block the following form of radiation?
alpha A) lead suit B) suntan lotion C) thick leather D) T-shirt E) none of the above
On the Moon, no air is present. As such, which of the following waves cannot be detected
a. optical b. infrared c. radio d. sound
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 31 N b. 36 N c. 41 N d. 46 N e. 23 N