200 g of ice at 0C is dropped into a calorimeter of negligible heat capacity containing 350 g of water at 20C. What is the temperature of the system when it reaches equilibrium? The latent heat of fusion of water is 80 cal/g.
A)
0C
B)
24C
C)
-13C
D)
13C
E)
-24C
Question 2
A torsion pendulum consists of a uniform rod hanging horizontally from thin wire tied to its center.
When the wire is twisted through an angle , the wire exerts a torque = -, where = 0.0016 Nm/rad. The rod has a mass of 35 grams and is 10 cm long. What is the period of the torsional oscillations of the pendulum?
A)
0.85 s
B)
1.4 s
C)
0.99 s
D)
2.1 s
E)
0.023 s
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