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3 years ago

If a 2 kg block of aluminium (SHC: 921 J/kg°C) is heated from 20°C to 40°C, how much energy was transferred to it?

Physics

1 answer:

IRISSAK [1]3 years ago

4 0

H = mc∆T

where, H=heat energy

c = SHC

H = 2*921*(40-20)

H = 36840J

H = 36.84KJ

The energy transferred to it is 36.84KJ

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a waves amplitude is 0.5 meters. If the amplitude is increased to 1 metro, how does its energy change

marysya [2.9K]

Answer:

The energy becomes 4 times greater.

Explanation:

We know that the energy of a wave is proportional to the square of its amplitude

E ∝ Amplitude^2

Since the original amplitude = 0.5 m

and the new amplitude becomes = 1 m

We are doubling the amplitude. This means that the new energy will be affected by a factor of 4

E_new ∝ (2*Amplitude)^2 =

E_new ∝ 4*(Amplitude)^2

E_new = 4*E

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3 years ago

Two point charges are separated by 6.4 cm . The attractive force between them is 10 N . Suppose that the charges attracting each

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Answer:

Two point charges are separated by 6.4 cm . The attractive force between them is 10 N .

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Explanation:

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2 years ago

Which property of a substance is not affected by physical changes?

Leokris [45]

The answer is A. Reactivity

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4 years ago

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Maurinko [17]

Answer:

Explanation:

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3 years ago

A 6.7 kg block is released from rest on a frictionless inclined plane making an angle of 25.7° with the horizontal. Calculate th

yulyashka [42]

Answer:

So time taken by block to travel 0.5 m from rest will be 0.4853 sec

Explanation:

We have given mass of the block m = 6.7 kg

angle of inclination $\Theta =25.7^{\circ}$

Distance traveled s = 0.5 m

Initial velocity u = 0 m/sec

Acceleration of the block $a=gsin\Theta =9.8\times sin25.7^{\circ}=4.243m/sec^2$

From second equation of motion we know that $S=ut+\frac{1}{2}at^2$

So $0.5=0\times t+\frac{1}{2}\times 4.243\times t^2$

$t^2=0.2356$

t = 0.4853 sec

So time taken by block to travel 0.5 m from rest will be 0.4853 sec

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4 years ago