A steel fork and a plastic spoon are both at the same temperature. The fork feels colder when you touch it. This is because:
1. Steel conducts thermal energy better than plastic.
2. Plastic loses more thermal energy than steel.
3. Steel contains more thermal energy than plastic.
4. The fork has more mass than the spoon.
Answers: 2
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Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?
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