A metal sheet of area 100cm2 was heated through 70&d...
A metal sheet of area 100cm2 was heated through 70°C. Calculate its new area if the linear expansivity of the metal is 0.000017K−1.
100.06 cm2
100.12cm2
100.24cm2
100.36cm2
Correct answer is C
Formula: A2 = A1(1 + βθ)
where β = The area expansivity
θ = Change in temperature.
β = 2α
where α = linear expansivity of the body.
⇒ β = 2 x 0.000017
= 0.000034 K−1
∴ A_2 = 100 (1 + (0.000034 x 70))
= 100(1 + 0.00238)
= 100(1.00238)
= 100.238 cm^2
= 100.24 cm^2 (to 2 d.p)
The ratio of the coefficient of linear expansion of two metals ∝1/∝2 is 3:4. If, when heated thr...
A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation? ...
A cell can supply current of 0.8A and 0.4A through a 2Ω and a 3Ω resistors respectively....
The rate of diffusion of gases increases with increase(s) in I. density II. temperature III, ...
The diagram above shoes three forces F1, F2 and F3, which of the following equations is correct?...