Physics-
General
Easy
Question
In figure shown on the right above, the spring constant is K. The mass of the upper disc is m and that of the lower disc is 3m. The upper block is depressed down from its equilibrium position by a distance d and released at t =0.
The value of d for which the minimum normal reaction on 3m from ground is mg is
- 3mg/K
- 2mg/K
- mg/2K
- mg/K
The correct answer is: mg/K
Related Questions to study
physics-
In figure shown on the right above, the spring constant is K. The mass of the upper disc is m and that of the lower disc is 3m. The upper block is depressed down from its equilibrium position by a distance d and released at t =0.
The minimum value of d for which the lower disc loses contact with the ground is
In figure shown on the right above, the spring constant is K. The mass of the upper disc is m and that of the lower disc is 3m. The upper block is depressed down from its equilibrium position by a distance d and released at t =0.
The minimum value of d for which the lower disc loses contact with the ground is
physics-General
physics-
In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = v0 at t = 0, at its equilibrium position.
If 
then, the maximum descent of the block from t = 0 is
In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = v0 at t = 0, at its equilibrium position.
If then, the maximum descent of the block from t = 0 is
physics-General
physics-
In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = 
at t = 0, at its equilibrium position.
The value of for which the minimum pull force on ceiling is 
, will be
In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = at t = 0, at its equilibrium position.
The value of for which the minimum pull force on ceiling is , will be
physics-General
physics-
In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = v0 at t = 0, at its equilibrium position.
The value of for which the block has zero velocity when spring is in its natural position is
In figure shown on the right, the spring constant is K. The mass of block is m. The block is imparted a downward velocity = v0 at t = 0, at its equilibrium position.
The value of for which the block has zero velocity when spring is in its natural position is
physics-General
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A particle starts from a point P at a distance of A/2 from the mean position O & travels towards left as shown in the figure. If the time period of SHM, executed about O is T and amplitude A then the equation of motion of particle is :
A particle starts from a point P at a distance of A/2 from the mean position O & travels towards left as shown in the figure. If the time period of SHM, executed about O is T and amplitude A then the equation of motion of particle is :
physics-General
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The correct order of hybridization of the central atom in the following species 
and 
is (At. No. Pt = 78)
The correct order of hybridization of the central atom in the following species and is (At. No. Pt = 78)
chemistry-General
chemistry-
A complex compound of cobalt has molecular formula containing five 
molecules, one nitro group and two chlorine atoms for one Co atom. one mole of this compound produces three mole ions in aq. Solution. On reacting with excess of 
solution, two moles of AgCl get precipitated. The ionic formula of the compound is
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chemistry-General
chemistry-
In the Hofmann rearrangement an unsubstituted amide is treated with sodium hydroxide and bromine to give a primary amine that has one carbon lesser than starting amide.
General reaction :
Mechanism :
If the migrating group is chiral then its configuration is retained. Electron releasing effects in the migrating group increases reactivity of Hofmann rearrangement.
Which of the following compound(s) cannot give Hoffmann rearrangement :
In the Hofmann rearrangement an unsubstituted amide is treated with sodium hydroxide and bromine to give a primary amine that has one carbon lesser than starting amide.
General reaction :
Mechanism :
If the migrating group is chiral then its configuration is retained. Electron releasing effects in the migrating group increases reactivity of Hofmann rearrangement.
Which of the following compound(s) cannot give Hoffmann rearrangement :
chemistry-General
chemistry-
Statement-I : The order of base catalysed hydrolysis of ester is
1) 
2) 
Statement-II : 
The reaction is sterically as well as electronically controlled reaction.
Statement-I : The order of base catalysed hydrolysis of ester is
1)
2)
Statement-II : The reaction is sterically as well as electronically controlled reaction.
chemistry-General
chemistry-
Select the correct statement.
Select the correct statement.
chemistry-General
chemistry-
X is :
X is :
chemistry-General
chemistry-
X is :
X is :
chemistry-General
chemistry-
Identify final product in the following reaction
Identify final product in the following reaction
chemistry-General
chemistry-
Which of the following is correct order of esterification of following acids with CH3OH :
I) HCOOH
II) 
III) 
IV) 
Which of the following is correct order of esterification of following acids with CH3OH :
I) HCOOH
II)
III)
IV)
chemistry-General
chemistry-
The product (Q) is
The product (Q) is
chemistry-General
