The displacement from mean position of a particle in SHM at 3 s is $\frac{\sqrt{3}}{2}$ of the amplitude, then its time period is
18 s
$\frac{6 \sqrt{3}}{2} \mathrm{~s}$
9 s
$\frac{3 \sqrt{3}}{2} \mathrm{~s}$
A cylindrical magnet has a length of 15 cm and diameter 3 cm . If it has uniform magnetisation of $4.0 \times 10^3 \mathrm{Am}^{-1}$, then magnetic dipole moment is
$0.42 \mathrm{JT}^{-1}$
$0.84 \mathrm{JT}^{-1}$
$0.21 \mathrm{JT}^{-1}$
$0.58 \mathrm{JT}^{-1}$
A parallel beam of fast moving electrons is incident normally on a narrow slit. If the speed of the electrons is decreased, the angular width of central maxima
increases
decreases
remains same
None of these
When a ball of mass 5 kg hits a bat with a velocity $3 \mathrm{~m} / \mathrm{s}$, in positive direction and it moves back with a velocity $4 \mathrm{~m} / \mathrm{s}$, find the impulse in SI units.
5
15
25
35
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