The temperature of a body falls from \(50^{\circ}\mathrm{C}\) to \(40^{\circ}\mathrm{C}\) in 10 minutes. If the temperature of the surroundings is \(20^{\circ}\mathrm{C}\), then the temperature of the body after another 10 minutes will be:
1. \(36.6^{\circ}\mathrm{C}\)          
2. \(33.3^{\circ}\mathrm{C}\)
3. \(35^{\circ}\mathrm{C}\)             
4. \(30^{\circ}\mathrm{C}\)

Subtopic:  Newton's Law of Cooling |
 79%
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A pan filled with hot food cools in 2 minutes from \(94^{\circ}\mathrm{C}\) to \(86^{\circ}\mathrm{C}\) when the room temperature is \(20^{\circ}\mathrm{C}\). How long will it take to cool from \(71^{\circ}\mathrm{C}\) to \(69^{\circ}\mathrm{C}\)?
1. 50 sec
2. 52 sec
3. 42 sec
4. 48 sec

Subtopic:  Newton's Law of Cooling |
 78%
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A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling?

1. 2.
3. 4.
Subtopic:  Newton's Law of Cooling |
 78%
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A certain quantity of water cools from \(70^{\circ}\mathrm{C}\) to \(60^{\circ}\mathrm{C}\) in the first 5 minutes and to \(54^{\circ}\mathrm{C}\) in the next 5 minutes. 
The temperature of the surroundings will be: 

1. \(45^{\circ}\mathrm{C}\) 2. \(20^{\circ}\mathrm{C}\)
3. \(42^{\circ}\mathrm{C}\) 4. \(10^{\circ}\mathrm{C}\)
Subtopic:  Newton's Law of Cooling |
 76%
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Hot coffee in a mug cools from \(90^{\circ}\mathrm{C}\) to \(70^{\circ}\mathrm{C}\) in 4.8 minutes. The room temperature is \(20^{\circ}\mathrm{C}\). Applying Newton's law of cooling, the time needed to cool it further by \(10^{\circ}\mathrm{C}\) should be nearly:

1. 4.2 minute 2. 3.8 minute
3. 3.2 minute 4. 2.4 minute
Subtopic:  Newton's Law of Cooling |
 69%
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