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alisha [4.7K]
3 years ago
12

An electric Kettle is rated at 25 W. Calculate the quantity of heat generated in 2s

Physics
1 answer:
MatroZZZ [7]3 years ago
4 0

Answer:

Energy consumed by the electric kettle in 9.5 min =Pt=(2.5×10

3

)×(9.5×60)=14.25×10

5

J

Energy usefully consumed =msΔT=3×(4.2×10

3

)×(100−15)=10.71×10

5

where s=4.2J/g

o

C= specific heat of water and boiling point temp=100

o

C

Heat lost =14.25×10

5

−10.71×10

5

=3.54×10

5

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Answer:

B) Pressure on the scale, not registered as weight.

Explanation:

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If a metal has a mass of 78.2 g and a volume of 11.4 mL, what is its density?
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A I think

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Which cannot be separated into simpler substances?
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A particularly beautiful note reaching your ear from a rare Stradivarius violin has a wavelength of 39.1 cm. The room is slightl
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Given Information:  

Wavelength =  λ = 39.1 cm = 0.391 m

speed of sound = v = 344 m/s

linear density = μ = 0.660 g/m = 0.00066 kg/m

tension = T = 160 N

Required Information:

Length of the vibrating string = L = ?

Answer:

Length of the vibrating string = 0.28 m

Explanation:

The frequency of beautiful note is

f = v/λ

f = 344/0.391

f = 879.79 Hz

As we know, the speed of the wave is

v = √T/μ

v = √160/0.00066

v = 492.36 m/s

The wavelength of the string is

λ = v/f

λ = 492.36/879.79

λ = 0.5596 m

and finally the length of the vibrating string is

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L = λ/2

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L = 0.28 m

Therefore, the vibrating section of the violin string is 0.28 m long.

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3 years ago
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