General Knowledge - Physics - Discussion
Discussion Forum : Physics - Section 1 (Q.No. 15)
15.
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
Discussion:
21 comments Page 1 of 3.
Aravind said:
1 decade ago
@Vivetha.
Impulse is the force acting on a body for a particular time.
Hence impulse is the product of impulse=f*t.
Due to impulse a moment of force occurs that is m*v.
Hence the dimensional formula for them is for impulse [M L T^-1].
AND FOR MOMENT OF FORCE IT IS Newton meter == (kgm/sec^2) *m.
Kgm^2/sec^2.
Impulse is the force acting on a body for a particular time.
Hence impulse is the product of impulse=f*t.
Due to impulse a moment of force occurs that is m*v.
Hence the dimensional formula for them is for impulse [M L T^-1].
AND FOR MOMENT OF FORCE IT IS Newton meter == (kgm/sec^2) *m.
Kgm^2/sec^2.
Deepthi said:
6 years ago
Angular momentum is a rotational representation of linear momentum. So, its Dimension is same as linear momentum ML^2T^-1.
Proton's energy = Planck's constant x Frequency.
Nm*s = Planck's constant since, (1/Freq) = s.
(Kgm/s^2)m*s = Kgm^2/s
Dimension is ML^2T^-1.
Proton's energy = Planck's constant x Frequency.
Nm*s = Planck's constant since, (1/Freq) = s.
(Kgm/s^2)m*s = Kgm^2/s
Dimension is ML^2T^-1.
Adebayo said:
1 decade ago
Excuse me is the unit of force the same as that of change of linear momentum. Force=ma and /\Momentum=mv-mu. Unit of force is newton(kgm/s^2) while momentum is Kgm/s. Pls are the two entitles thesame? Im really confused, kindly forward your views to me. Thank u!
Vivetha.h said:
1 decade ago
Impulse and the moment of force have identical quantites, just I need a correct explanation, how it I identified? how it is derived? any one can give me a correct explanation, if so, fast as you can possible, ok, wish you all the best, bye.
Getnet Tegenie said:
1 decade ago
You are correct, but you didn't agree with your idea. Young's modulus has the same unit with stress or pressure. So the answer is only choice C which has quantities with different dimensions. The rest all choices have the same dimensions.
Amit Kumar Sahu said:
1 decade ago
Impulse means change in the momentum of a body
i.e. Impulse = Ft = mv - mu
The turning effect of force about the axis of rotation is called moment of force or torque.
So they don't have any units... resulting no dimensions!!
i.e. Impulse = Ft = mv - mu
The turning effect of force about the axis of rotation is called moment of force or torque.
So they don't have any units... resulting no dimensions!!
Mohan said:
1 decade ago
B also could be right.
Pressure = Force/Area,
Stress = Force/Area,
Young's modulus = Stress/Strain,
Strain has no units.
So, Pressure and Young's modulus have same dimensions.
Please correct me if I am wrong.
Pressure = Force/Area,
Stress = Force/Area,
Young's modulus = Stress/Strain,
Strain has no units.
So, Pressure and Young's modulus have same dimensions.
Please correct me if I am wrong.
Paul martiins said:
9 years ago
Impulse = ft (the signal recieved by an object)
where f = newton and t = sec unit=(N/sec2).
While moment is returning effect an object makes or is de product of force * distance unit =(N/m2).
where f = newton and t = sec unit=(N/sec2).
While moment is returning effect an object makes or is de product of force * distance unit =(N/m2).
Paul said:
9 years ago
From Bohr theory, Angular momentum is equal to plank constant, ie L=nh where n= 1, 2, 3.
Also Angular momentum L = n * Dirac constant divided by 2 pie. Option C is the correct answer.
Also Angular momentum L = n * Dirac constant divided by 2 pie. Option C is the correct answer.
Mohammad Afzal said:
10 years ago
@Mohan: Force = MLT^-2 and Pressure = Force/area = (MLT^-2)/(L^2).
Hence, Pressure = ML^-1T^-2.
Whereas,
Young's Modulus = Pressure/Length = ML^-2T^-2.
Hence, Pressure = ML^-1T^-2.
Whereas,
Young's Modulus = Pressure/Length = ML^-2T^-2.
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