Physics-
General
Easy
Question
A string is wrapped around the rim of a wheel of moment of inertia 0.20 kg-
and radius 20 cm. The wheel is free to rotate about its axis and initially the wheel is rest. The string is now pulled by a force of 20N. The angular velocity of the string after 5 seconds will be:–
- 90 rad/s
- 70 rad/s
- 95 rad/s
- 100 rad/s
The correct answer is: 100 rad/s
Related Questions to study
physics-
In figure, the winch is mounted on an axle, and the 6-sided nut is welded to the winch. By turning the nut with a wrench, a person can rotate the winch. For instance, turning the nut clockwise lifts the block off the ground, because more and more rope gets wrapped around the winch. Three students agree that using a longer wrench makes it easier to turn the winch. But they disagree about why. All three students are talking about the case where the winch is used, over a 10 s time interval, to lift the block one metre off the ground.
Student 1 By using a longer wrench, the person decreases the average force he must exert on the wrench, in order to lift the block one metre in 10s.
Student 2 : Using a longer wrench reduces the work done by the person as he uses the winch to lift the block 1m in 10s.
Student 3 : Using a longer wrench reduces the power that the person must exert to lift the block 1m in 10s.Which of the following is true about student 2 and 3 :-
In figure, the winch is mounted on an axle, and the 6-sided nut is welded to the winch. By turning the nut with a wrench, a person can rotate the winch. For instance, turning the nut clockwise lifts the block off the ground, because more and more rope gets wrapped around the winch. Three students agree that using a longer wrench makes it easier to turn the winch. But they disagree about why. All three students are talking about the case where the winch is used, over a 10 s time interval, to lift the block one metre off the ground.
Student 1 By using a longer wrench, the person decreases the average force he must exert on the wrench, in order to lift the block one metre in 10s.
Student 2 : Using a longer wrench reduces the work done by the person as he uses the winch to lift the block 1m in 10s.
Student 3 : Using a longer wrench reduces the power that the person must exert to lift the block 1m in 10s.Which of the following is true about student 2 and 3 :-
physics-General
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A pendulum beating seconds is taken from the earth to a planet having both the mass and radius half as compared to the earth The time period of the pendulum will be
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the dimensions of (force constant / mass)
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maths-General
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Find real part of 
Find real part of
maths-General
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If 
then x =
If then x =
maths-General
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The value of 
is
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maths-General
chemistry-
The enthalpy of vapourisation of liquid water using the data :
The enthalpy of vapourisation of liquid water using the data :
chemistry-General
chemistry-
The conversion A to B is carried out by the following path :
Given 
e.u.,
e.u.,
e.u.
Where e.u. is entropy unit then 
is
The conversion A to B is carried out by the following path :
Given e.u.,
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Where e.u. is entropy unit then is
chemistry-General
chemistry-
A reversible process is taking place at constant temperature and pressure. Then at equilibrium
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Consider the following processes :
For B+D
E+2C, 
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For B+DE+2C, will be-
chemistry-General
chemistry-
From the following bond energies :
bond energy : 
bond energy : 
bond energy : 
bond energy : 
Enthalpy for the reaction,
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bond energy :
bond energy :
bond energy :
bond energy :
Enthalpy for the reaction,
will be:
chemistry-General
chemistry-
For a phase change 
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chemistry-General
chemistry-
The heat change during the reaction 24 gC and 128 gS following the change 
cal
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In which reaction ΔS is positive -
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chemistry-General
