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san4es73 [151]
3 years ago
5

A fire helicopter carries a 580-kg bucket of water at the end of a 20.0-m long cable. Flying back from a fire at a constant spee

d of 40.0 m/s, the cable makes an angle of 38.0° with respect to the vertical. Determine the force exerted by air resistance on the bucket.
Physics
1 answer:
inn [45]3 years ago
4 0

Answer:

F = 41,954 N

Explanation:

given,

mass of bucket = 580 Kg

length of the cable = 20 m

velocity = 40 m/s

angle made = 38.0°

T cos 38° = m g..............(1)

T sin 38^0 = \dfrac{mv^2}{l} + F......(2)

dividing equation (2) by (1)

tan 38^0 = \dfrac{\dfrac{mv^2}{l} + F}{mg}

tan 38^0 = \dfrac{\dfrac{580\times 40^2}{20} + F}{580 \times 9.81}

4445.36 = \dfrac{580\times 40^2}{20} + F

F = -46400 + 4445.36

F = -41,954 N

hence, the force is acting in the opposite direction as assumed.

F = 41,954 N

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Explanation:

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     heat of fusion of water = 334 J/g

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Here wee need to convert 1 kg ice from -13°C to vapor at 100°C

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Mass of water = 1000 g

Heat energy required to change ice temperature from -13°C to 0°C

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Heat energy required to change water temperature from 0°C to 100°C  

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Heat energy required to change water from 100°C to steam at 100°C  

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Total heat energy required

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Heat energy needed = 3036.17 kJ

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