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chemistry-
Arrange following compounds in decreasing order of reactivity for hydrolysis reaction :
I) 
II) 
III) 
IV) 
Arrange following compounds in decreasing order of reactivity for hydrolysis reaction :
I)
II)
III)
IV)
chemistry-General
chemistry-
Reagent [X] is :
Reagent [X] is :
chemistry-General
chemistry-
The acid D obtained through the following sequence of reactions is
The acid D obtained through the following sequence of reactions is
chemistry-General
physics-
A wire having cross-sectional area S is attached to wall on one side and a block of mass M on the other side which placed on a horizontal surface having coefficient of friction 
as shown. Material of wire has coefficient of thermal expansion 
and Young's modulus Y. At initial temperature there is no stress in the wire. Now the wire is cooled. At what decrease in temperature the block will begin to move.
A wire having cross-sectional area S is attached to wall on one side and a block of mass M on the other side which placed on a horizontal surface having coefficient of friction as shown. Material of wire has coefficient of thermal expansion and Young's modulus Y. At initial temperature there is no stress in the wire. Now the wire is cooled. At what decrease in temperature the block will begin to move.
physics-General
physics-
In the given figure F = 10 N, R = 1 m, mass of the body is 2 kg and moment of inertia of the body about an axis passing through O and perpendicular to plane of body 
O is the centre of mass of the body.
If ground is sufficiently rough to ensure rolling, what is kinetic energy of the body now in the given time interval
In the given figure F = 10 N, R = 1 m, mass of the body is 2 kg and moment of inertia of the body about an axis passing through O and perpendicular to plane of body O is the centre of mass of the body.
If ground is sufficiently rough to ensure rolling, what is kinetic energy of the body now in the given time interval
physics-General
physics-
In the given figure F = 10 N, R = 1 m, mass of the body is 2 kg and moment of inertia of the body about an axis passing through O and perpendicular to plane of body O is the centre of mass of the body.
If the ground is smooth what is total kinetic energy of the body after 2 seconds
In the given figure F = 10 N, R = 1 m, mass of the body is 2 kg and moment of inertia of the body about an axis passing through O and perpendicular to plane of body O is the centre of mass of the body.
If the ground is smooth what is total kinetic energy of the body after 2 seconds
physics-General
physics-
A conical pendulum consists of a mass M suspended from a string of length l. The mass executes a circle of radius R in a horizontal plane with speed v. At time t, the mass is at position 
and has velocity 
At time t, the angular momentum vector of the mass M about the point from which the string suspended is :
A conical pendulum consists of a mass M suspended from a string of length l. The mass executes a circle of radius R in a horizontal plane with speed v. At time t, the mass is at position and has velocity At time t, the angular momentum vector of the mass M about the point from which the string suspended is :
physics-General
physics-
Velocity of the centre of smaller cylinder is v. There is no slipping anywhere. The velocity of the centre of larger cylinder is
Velocity of the centre of smaller cylinder is v. There is no slipping anywhere. The velocity of the centre of larger cylinder is
physics-General
physics-
A system of uniform cylinders and plates is shown. All the cylinders are identical and there is no slipping at any contact. Velocity of lower & upper plate is V and 2V respectively as shown. Then the ratio of angular speed of the upper cylinders to lower cylinders is
A system of uniform cylinders and plates is shown. All the cylinders are identical and there is no slipping at any contact. Velocity of lower & upper plate is V and 2V respectively as shown. Then the ratio of angular speed of the upper cylinders to lower cylinders is
physics-General
physics-
A ladder AP of length 5 m is inclined to a vertical wall is slipping over a horizontal surface with velocity of 2 m/s, when A is at a distance 3m from ground what is the velocity of C.M. at this moment
A ladder AP of length 5 m is inclined to a vertical wall is slipping over a horizontal surface with velocity of 2 m/s, when A is at a distance 3m from ground what is the velocity of C.M. at this moment
physics-General
physics-
Find minimum height of obstacle so that the sphere can stay in equilibrium.
Find minimum height of obstacle so that the sphere can stay in equilibrium.
physics-General
physics-
In figure 1, 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-second time interval, to lift the block one meter 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 meter in ten seconds.
Student 2 Using a longer wrench reduces the work done by the person as he uses the winch to lift the block one meter in ten seconds.
Student 3 Using a longer wrench reduces the power that the person must exert to lift the block one meter in ten seconds. (Wrench turns winch clockwise) Figure 1 Figure 2
Which of the following is true about students 2 and 3?
In figure 1, 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-second time interval, to lift the block one meter 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 meter in ten seconds.
Student 2 Using a longer wrench reduces the work done by the person as he uses the winch to lift the block one meter in ten seconds.
Student 3 Using a longer wrench reduces the power that the person must exert to lift the block one meter in ten seconds. (Wrench turns winch clockwise) Figure 1 Figure 2
Which of the following is true about students 2 and 3?
physics-General
physics-
In figure 1, 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-second time interval, to lift the block one meter 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 meter in ten seconds.
Student 2 Using a longer wrench reduces the work done by the person as he uses the winch to lift the block one meter in ten seconds.
Student 3 Using a longer wrench reduces the power that the person must exert to lift the block one meter in ten seconds. (Wrench turns winch clockwise) Figure 1 Figure 2
Student 1 is:
In figure 1, 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-second time interval, to lift the block one meter 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 meter in ten seconds.
Student 2 Using a longer wrench reduces the work done by the person as he uses the winch to lift the block one meter in ten seconds.
Student 3 Using a longer wrench reduces the power that the person must exert to lift the block one meter in ten seconds. (Wrench turns winch clockwise) Figure 1 Figure 2
Student 1 is:
physics-General
physics-
Two solid uniform disks of equal mass each are mounted to rotate about an axis fixed through the center of the disk. Each disk is initially at rest. The radii of the disks are r1 < r2 A force F is applied to each disk at its edge for the same amount of time. Assume that friction at pulley axis is negligible. What statement is true about the kinetic energy (K) and magnitude of angular momentum (L) of the disks?
Two solid uniform disks of equal mass each are mounted to rotate about an axis fixed through the center of the disk. Each disk is initially at rest. The radii of the disks are r1 < r2 A force F is applied to each disk at its edge for the same amount of time. Assume that friction at pulley axis is negligible. What statement is true about the kinetic energy (K) and magnitude of angular momentum (L) of the disks?
physics-General
physics-
An L shaped thin uniform rod of total length 2l is free to rotate in a vertical plane about a horizontal axis at P as shown in the figure The bar is released from rest. Neglect air and contact friction. The angular velocity at the instant it has rotated through 90° and reached the dotted position shown is
An L shaped thin uniform rod of total length 2l is free to rotate in a vertical plane about a horizontal axis at P as shown in the figure The bar is released from rest. Neglect air and contact friction. The angular velocity at the instant it has rotated through 90° and reached the dotted position shown is
physics-General
