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romanna [79]
3 years ago
12

The latent heat of fusion of alcohol is 50 kcal/kg and its melting point is -54oC. It has a specific heat of 0.60 in its liquid

state. Calculate the energy needed to melt 2.0 kg of solid alcohol at -54o and raise it to a temperature of -4°C.
40. kcal
100 kcal
160 kcal
280 kcal
Physics
1 answer:
sashaice [31]3 years ago
5 0

Answer:

C

Explanation:

To melt the alcohol

Heat needed = M . L  = 2 . 25  = 50 kcal

To warm up the alcohol

Heat needed = M . sp. ht. . ∆t   = 2 . 0.6 . 100  = 120 kcal

Total heat needed = 170 kcal

Assuming that 0.6 kcal/ kg / ˚C  is the specific heat and that the answer is wanted in kcal ( a rather odd unit to be in use here.)

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Divers change their body position in midair while rotating about their center of mass. In one dive, the diver leaves the board w
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Answer:

Her angular velocity when tucked is greater than when straight by a factor of 0.23

Explanation:

Moment of inertia (I) = mr^2 = mv^2/w^2

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When straight, I = 14 kg.m^2

mv^2/w^2 = 14

w^2 = mv^2/14

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5 0
4 years ago
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A gold bar has a volume of 4.7 cm3 and a density of 19.3 g/ cm3. What is its mass?
Sunny_sXe [5.5K]

Answer:

Mass of the gold bar is 90.71 gram.

Explanation:

Given:

volume = 4.7 cm^{3}

density = 19.3 \frac{g}{cm^{3}}

To find:

mass = ?

Formula used:

density = \frac{mass}{volume}

Solution:

density is given by,

density = \frac{mass}{volume}

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Mass of the gold bar is 90.71 gram.

8 0
4 years ago
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