Share Answer Efficiency = \(\frac{ma}{V.R}\) x \(\frac{100}{1}\)

V.R = number of pulleys = 6

ma = \(\frac{\text{Load}}{\text{Effort}}\) = \(\frac{200}{50}\) = 4

Effiecieny = \(\frac{4}{6}\) \(\times\) 100 = 66.67%

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Resistor connected in a parallel have an equivalence given by
\(\frac{1}{\text{Reff}}\) = \(\frac{1}{3}\) + \(\frac{1}{3}\) + \(\frac{1}{3}\)

= \(\frac{1 + 1 + 1}{3}\) = \(\frac{3}{3}\) = 1

Reff = 1

Share Answer Compressor is an instrument to supply air or other gas at increased pressure
Refrigerator is an appliance to keep things cold
Air blower is used to release air
Air conditioner is used to remove heat and maintain a stable temperature in an occupied space

Share Answer Isotopy is due to difference in mass number, what causes the difference is the difference in the number of neutrons present

Share Answer Thermal expansion of a solid is majorly advantageous in the use of bimetallic strip in the balance of a watch so as not to lose time

Share Answer Moment of a force is the product of a force and the perpendicular distance from the line of action of the force
Moment = force \(\times\) distance
= N \(\times\) m
= Nm

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Explanation not provided, please join discuss, your contributions are welcomed

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Magnification = \(\frac{\text{Length of camera}}{\text{distance of object from pin hole}}\)

m = \(\frac{12}{60}\)

= 0.2

Also magnification m = \(\frac{\text{Height of image}}{\text{Height of object}}\)

Height of image = m \(\times\) height of object

= 0.2 \(\times\) 70

= 14cm

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H = mc

H_P = H_Q, _P = 2q,

m_P = \(\frac{1}{2}\)m_Q

H_P = m_QC_PP, also HQ = m_QC_QQ

Since H_P = H_Q

m_Pc_PP = m_Qc_Pq

Putting in the conditions

\(\frac{1}{2}\)m_Q \(\times\) c_P \(\times\) 2_Q = m_Q \(\times\) _Q \(\times\) c_Q

c_P = c_Q

\(\frac{C_p}{C_Q}\)= \(\frac{1}{1}\)

= 1:1

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The relationship between the peak value and r.m.s value of electricity supply is given as

V\(_{r.m.s}\) = \(\frac{V_o}{\sqrt{2}}\)

where V_o = peak voltage

V_o = V\(_{r.m.s}\) x \(\sqrt{2}\)

= 240 x \(\sqrt{2}\)

= 339.5v

= 340v