A 34-kg child on an 18-kg swing set swings back and forth through small angles.
If the length of the very light supporting cables for the swing is how long does it take for each complete back-and-forth swing? Assume that the child and swing set are very small compared to the length of the cables. A) 4.4 s
B) 4.8 s
C) 5.3 s
D) 5.7 s
Question 2
When a sample of water at 0.0C is cooled to 36.0C and freezes in the process, 935,000 kJ of thermal energy is liberated. What is the mass of this sample of water? For water LF = 334,000 J/kg, LV = 2.
256 106 J/kg, and the specific heat of ice is 2050 J/kg C. A) 2290 kg
B) 1145 kg
C) 2800 kg
D) 12,700 kg
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