7.0 x 1011Nm-2
7.5 x 1011Nm-2
8.5 x 1011Nm-2
9.0 x 1011Nm-2
Correct answer is B
Young's modulus = \(\frac{F}{A}\) \(\div\) \(\frac{e}{L}\)
= \(\frac{20}{8 \times 10^{-7}}\) \(\div\) \(\frac{10^{-4}}{3}\)
= 7.5 x 1011Nm-2
90.0%
85.0%
80.0%
65.0%
Correct answer is C
Efficiency = output x 100
= \(\frac{\frac{200 {\times} 10 {\times} {6}}{10}}{1500}\) x \(\frac{100}{1}\)
= 80%
10 J
20 J
30 J
50 J
Correct answer is C
Using, v2 = u2 - 2gx
(20)2 = u21/2 x 10 x 10
u2 = 600(m/s)2
initial K.E = - mu2
= \(\frac{1}{2}\) x 600
= 30 J
1 : 5
2 : 5
3 : 5
4 : 5
Correct answer is B
g = \(\frac{GM}{R^2}\)
\(\frac{G_1M_1}{r^2_1}\) = \(\frac{G_2M_2}{r^2_2}\)
\(\frac{G_1M_1}{r^2_1}\) = \(\frac{G_2 {\times}10 M_1}{(2r_1)^2}\)
\(\frac{G_1}{G_2}\) = \(\frac{2}{5}\)
15N
20N
35N
45N
Correct answer is C
F = mg + ma
F = 2 [10 + \(\frac{(40 - 10)}{4}\)]
F = 35 N