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tangare [24]
4 years ago
13

an alarm clock draws 0.5 a of current when connected to a 120 volt circuit. calculate its resistance.

Physics
1 answer:
Digiron [165]4 years ago
7 0

Resistance = (potential difference) / (current) = 120V / 0.5A  = <em> 240 ohms .</em>


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Two particles, each of mass m, are initially at rest very far apart.Obtain an expression for their relative speed of approach at
PSYCHO15rus [73]

Answer:

|\Delta v |=\sqrt{\frac{4Gm}{d} }

Explanation:

Consider two particles are initially at rest.

Therefore,

the kinetic energy of the particles is zero.

That initial K.E. = 0

The relative velocity with which both the particles are approaching each other is Δv and their reduced masses are

\mu= \frac{m_1m_2}{m_1+m_2}

now, since both the masses have mass m

therefore,

\mu= \frac{m^2}{2m}

= m/2

The final K.E. of the particles is

KE_{final}=\frac{1}{2}\times \mu\times \Delta v^2

Distance between two particles is d and the gravitational potential energy between them is given by

PE_{Gravitational}= \frac{Gmm}{d}

By law of conservation of energy we have

KE_{initial}+KE_{final}= PE_{gravitaional}

Now plugging the values we get

0+\frac{1}{2}\frac{m}{2}\Delta v^2= -\frac{Gmm}{d}

|\Delta v |=\sqrt{\frac{4Gm}{d} }

=\sqrt{\frac{Gm}{d} }

This the required relation between G,m and d

5 0
3 years ago
Tito knows that one of the reasons people do not return to his electronics store is because of the slow service. How would a SWO
klemol [59]

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inna [77]
Second law of physics. F = MA
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I believe you are capable of doing the rest
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Anni [7]
F=ma
8480=26.5m
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8 0
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ss7ja [257]

Answer:

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Explanation:

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