The ball takes the longest time to disappear under condition 2. Of all the information given, the temperature makes the biggest difference in this problem. Since the freezing point of fresh water is 32 degrees Fahrenheit, the lake surface will be frozen solid at a temperature of 20 degrees Fahrenheit. Thus, the ball will fall 5 feet to the surface and after a few bounces will to come to rest and
stay put.
What will be an ideal response?
Only one trip to the lamp room is required to match each lamp with its
switch. Here is how to do it:
• In the switch room turn on two lamps.
• After a few minutes, turn off one of these.
• Then go to the lamp room.
• The lamp that is on matches the switch you left on.
• The lamp that is off but has a warm bulb,
matches the switch you turned on then off
• The remaining lamp matches the remaining switch.
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