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3 years ago

How much energy is needed to raise the temperature of a 55g sample of aluminum from 22.4 to 94.6?

1 answer:

3 0

The heat needed is given by Mcθ , where m is the mass in Kg, c is the heat capacity of aluminium, and θ is the change in temperature.
Specific heat capacity of aluminium is 0.9 j/g°c
thus; Heat = 55 × 0.9 × 72.2
= 3573.9 Joules or 3.574 kJ

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Answer:

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D) by using military force.

Explanation:

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3 years ago

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$\mathrm{v}_{2} \text { velocity after the collision is } 3.3 \mathrm{m} / \mathrm{s}$

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It says “Momentum before the collision is equal to momentum after the collision.” Elastic Collision formula is applied to calculate the mass or velocity of the elastic bodies.

$m_{1} v_{1}=m_{2} v_{2}$

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$\mathrm{v}_{1} \text { velocity before the collision }$

$\mathrm{v}_{2} \text { velocity after the collision }$

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$\text { Velocity before the collision } v_{1}=5 \mathrm{m} / \mathrm{s}$

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3 years ago

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The minimum speed when she leave the ground is 6.10 m/s.

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