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Elina [12.6K]
3 years ago
8

If 30.45 grams of water is to be heated up 3.3 degrees to make baby

Physics
1 answer:
KengaRu [80]3 years ago
8 0

Answer:

A. 420 J

Explanation:

Given the following data;

Mass = 30.45 g

Specific heat capacity = 4.18 J/g °C.

Temperature = 3.3°C

To find the quantity of heat;

Heat capacity is given by the formula;

Q = mct

Where;

Q represents the heat capacity or quantity of heat.

m represents the mass of an object.

c represents the specific heat capacity of water.

t represents the temperature.

Substituting into the equation, we have;

Q = 30.45 * 4.18 * 3.3

Q = 420.03 ≈ 420 Joules

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A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball
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Answer:

the velocity (magnitude and direction) of the ball)  just before the collision is v_i = 5.144 \ m/s

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Explanation:

According to the law of conservation of energy;

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v_f = [\frac{m_1 -m_2}{m_1+m_2}]v_i\\\\v_f =  [\frac{m_{ball} -m_{block}}{m_{ball}+m_{block}}]v_i\\\\v_f = [\frac{1.6 -2.5}{1.6+2.5}]*5.144\\\\

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The  velocity (magnitude and direction) of the ball)  just after  the collision is v_f = - 1.129  \ m/s

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