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leva [86]
3 years ago
8

Test Bank, Question 18.83 Inside a room at a uniform comfortable temperature, metallic objects generally feel cooler to the touc

h than wooden objects do. This is because: a given mass of wood contains more heat than the same mass of metal the human body, being organic, resembles wood more closely than it resembles metal metal conducts heat better than wood heat tends to flow from metal to wood
Physics
1 answer:
Oxana [17]3 years ago
3 0

Answer:

<em>metal conducts heat better than wood.</em>

<em></em>

Explanation:

Metals are generally good conductors of heat, and they usually conduct heat at a relatively rapid rate. Inside the room with a uniform temperature, a metal when touched will rapidly conduct the heat from your hand, leaving your hand with a cooler feeling. Wood on the other hand is a poor heat conductor, so the heat is not conducted from your hand fast enough to cool it up to the point that your hand feels cool.

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A) 50.0 g Al

Explanation:

We can calculate the temperature change of each substance by using the equation:

\Delta T=\frac{Q}{mC_s}

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A) m = 50.0 g, Cs = 0.903 J/g°C

\Delta T=\frac{200}{(50)(0.903)}=4.4^{\circ}C

B) m = 50.0 g, Cs = 0.385 J/g°C

\Delta T=\frac{200}{(50)(0.385)}=10.4^{\circ}C

C) m = 25.0 g, Cs = 0.79 J/g°C

\Delta T=\frac{200}{(25)(0.79)}=10.1^{\circ}C

D) m = 25.0 g, Cs = 0.128 J/g°C

\Delta T=\frac{200}{(25)(0.128)}=62.5^{\circ}C

E) m = 25.0 g, Cs = 0.235 J/g°C

\Delta T=\frac{200}{(25)(0.235)}=34.0^{\circ}C

As we can see, substance A) (Aluminium) is the one that undergoes the smallest temperature change.

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3 years ago
What are some of the physical and human made features that map symbols can represent
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A heat engine accepts 200,000 Btu of heat from a source at 1500 R and rejects 100,000 Btu of heat to a sink at 600 R. Calculate
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To solve the problem it is necessary to apply the concepts related to the conservation of energy through the heat transferred and the work done, as well as through the calculation of entropy due to heat and temperatra.

By definition we know that the change in entropy is given by

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Where,

Q = Heat transfer

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On the other hand we know that by conserving energy the work done in a system is equal to the change in heat transferred, that is

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According to the data given we have to,

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W = 100000 Btu

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