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Hard Questions
Basic Science
General Knowledge
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How many feet are in a football field that is 100 yards?
Hard
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What is the unit of viscosity? Please explain.
Hard
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Two particles of equal mass (m) each move in a circle of radius (r) under the action of their mutual gravitational attraction the speed of the particle is
A
$4rGm $
B
$21 rGm $
C
$2r4Gm $
D
$rGm $
Hard
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The dimensions of Planck's constant is
A
$M_{2}L_{2}T_{−1}$
B
$M_{2}LT_{−2}$
C
$ML_{2}T_{−1}$
D
$ML_{2}T_{−2}$
Hard
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Is angular momentum equal to Inertia
$×ω$
and why?
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Choose the correct answer from the alternatives given.
Time period is the time taken to complete one oscillation. This definition of time period is true for
A
longitudinal Wave
B
transverse Wave
C
simple Pendulum
D
All the above
Hard
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How do vectors work in physics?
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A block of mass 10 kg is placed at a distance of 5 m from the rear end of a long trolleyes shown in figure. The coefficient of friction between the block and the surface below is 0.2. Starting from the rest, the trolley is given a uniform acceleration of 3 ms. At what distance from the starting point will block fall off the trolley! Take
$g=10ms_{−3}$
A
15 m
B
20 m
C
25 m
D
30 m
Hard
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A uniform cylinder of mass
$m=8.0kg$
and radius
$R=1.3cm$
(Fig.) starts descending at a moment
$t=0$
due to gravity. Neglecting the mass of the thread, find:
(a) the tension of each thread and the angular acceleration of the cylinder.
(b) the time dependence of the instantaneous power developed by the gravitational force.
Hard
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How was it determined that a parsec is
$3.26$
light years?
Hard
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