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s = \(\frac{1}{2}\)ut + at² is a wrong equation, it should be s = \(\frac{1}{2}\)ut + at²

Share Answer Electromagnetic waves do not require any material medium, but sound waves is a mechanical wave that require a material medium

Share Answer Electric Field Intensity (E) = \(\frac{v}{d}\)

= \(\frac{\text{potential difference}}{\text{distance}}\)

= \(\frac{6.5v}{35cm}\)

= \(\frac{6.5}{35 \times 10^{- 2}}\)

= 18.57NC\(^{-1}\)

Share Answer Soldiers march disorderly while crossing a bridge to prevent resonance because when soldiers march in orderly manner across a bridge, they generate a rhythmic oscillation of wave out. The bridge and at a certain point, would start oscillation to the same rhym as that of the marching steps. This oscillation would reach a maximum peak when the bridge can no longer sustain its own strength and hence collapses. So for this reasons, soldier are ordered to march disorderly while crossing a bridge

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Upthrust = change in weight

density = \(\frac{\text{mass}}{\text{volume}}\)

Mass of liquid displaced = Density of Liquid \(\times\) Volume;

= 10³ \(\times\) 50 \(\times\) 10^-6m³

= 0.05kg

(Note that the volume of 50cm3 was converted to m³ by multiplying by 106) i.e 50cm³ = 50 \(\times\) 10?6m³)

Since mass displaced = 0.05kg

Upthrust = mg = 0.05 \(\times\) 10

= 0.5N

Share Answer Cathode rays are produced in a discharge tube under Low pressure and high voltage

Share Answer For work to be done, distance must be involved because
workdone = force \(\times\) distance

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Latent Energy = mass(m) \(\times\) specific latent heat (L)
E = mL

L = \(\frac{E}{m}\)

= \(\frac{1.13 \times 10 ^{6}}{15}\)

= 7.53 \(\times\) 10⁴Jkg\(^{-1}\)

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Internal resistance determine the maximum current that can be supplied

Efficiency =\(\frac{IR}{I(R + r)}\) \(\times\) 100

=\(\frac{I6}{I(6 + 2)}\) \(\times\) 100

= 75.00%

Share Answer Molecules of liquid are not stationary
Brownian motion is an evidence of particle nature of matter
matter is made up of molecules
The molecules of matter are in constant motion