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erma4kov [3.2K]

3 years ago

6

Can someone help me please? thank you

1 answer:

stepan [7]3 years ago

4 0

....................

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As the speed/velocity of an object increases what happens to the kinetic energy of the object

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Answer:

$a_1 = 1.446m/s^2$

Explanation:

Given

$m_1 = 70.0kg$ -- Mass of the boy

$m_2 = 45.0kg$ -- Mass of the girl

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Required

Determine the acceleration of the boy towards the girl ( $a_1$ )

From the question, we understand that the surface is frictionless. This implies that the system is internal and the relationship between the given and required parameters is:

$m_1 * a_1 = m_2 * a_2$

Substitute values for $m_1, m_2$ and $a_2$

$70.0 * a_1 = 45.0 * 2.25$

Make $a_1$ the subject

$\frac{70.0 * a_1}{70.0} = \frac{45.0 * 2.25}{70.0}$

$a_1 = \frac{45.0 * 2.25}{70.0}$

$a_1 = \frac{101.25}{70.0}$

$a_1 = 1.446m/s^2$

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The secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter. The turns ratio of t

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Answer:

The power consumed by the air filter is 9.936 watts

Explanation:

It is given that, the secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter.

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Current in the secondary coil, $I_s=1.8\times 10^{-3}\ A$

The power consumed by the air filter is :

$P_s=I_s\times V_s$ ...........(1)

For a transformer, $\dfrac{N_s}{N_p}=\dfrac{V_s}{V_p}$

So, $P_s=I_s\times (\dfrac{N_s}{N_p})\times V_p$

$P_s=1.8\times 10^{-3}\times (\dfrac{46}{1})\times 120$

$P_s=9.936\ Watts$

So, the power consumed by the air filter is 9.936 watts. Hence, this is the required solution.

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