Physics-
General
Easy
Question
Find minimum height of obstacle so that the sphere can stay in equilibrium.
The correct answer is:
Related Questions to study
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
physics-
A thin rod free to rotate about a horizontal axis through one end O is initially in unstable equilibrium position 1 and falls due to gravity on being displaced infinitesimally. In positions 2,3 and 4 it makes 60
, 90 and 180 with the upward vertical. Let 
be angular velocities of the rod in theses positions then
A thin rod free to rotate about a horizontal axis through one end O is initially in unstable equilibrium position 1 and falls due to gravity on being displaced infinitesimally. In positions 2,3 and 4 it makes 60 , 90 and 180 with the upward vertical. Let be angular velocities of the rod in theses positions then
physics-General
physics-
A uniform rod of length L and mass M is free to rotate about a frictionless pivot at one end as shown in the figure. The rod is released form rest in the horizontal position
A uniform rod of length L and mass M is free to rotate about a frictionless pivot at one end as shown in the figure. The rod is released form rest in the horizontal position
physics-General
physics-
A rectangular plate of mass 20kg is suspended from points A and B as shown. If pin B is removed determine the initial angular acceleration 
of plate. 
A rectangular plate of mass 20kg is suspended from points A and B as shown. If pin B is removed determine the initial angular acceleration of plate.
physics-General
physics-
The two small spheres each have a mass of 3 kg and are attached to the rod of negligible mass. A torque M = 8t Nm, where t is in seconds is applied to the rod Find the value of time when each sphere attains a speed of 3 m/s starting from rest.
The two small spheres each have a mass of 3 kg and are attached to the rod of negligible mass. A torque M = 8t Nm, where t is in seconds is applied to the rod Find the value of time when each sphere attains a speed of 3 m/s starting from rest.
physics-General
physics-
The moment of inertia of the pulley system as shown in the figure is 
The radii of bigger and smaller pulleys 2m and 1m respectively The angular acceleration of the pulley system is
The moment of inertia of the pulley system as shown in the figure is The radii of bigger and smaller pulleys 2m and 1m respectively The angular acceleration of the pulley system is
physics-General
physics-
A uniform rectangular solid of side length L and width w placed on a frictionless incline of variable angle, 
. Assume that there is a very tiny peg preventing the box from sliding down the incline at the point labeled P. At what angle of incline will the box begin to tip over?
A uniform rectangular solid of side length L and width w placed on a frictionless incline of variable angle, . Assume that there is a very tiny peg preventing the box from sliding down the incline at the point labeled P. At what angle of incline will the box begin to tip over?
physics-General
physics-
In the figure shown a long cart moves on a smooth horizontal surface due to an external constant force of magnitude F Initial mass of the cart is M0 and velocity is zero At t = 0 sand starts falling from a stationary hopper on to the cart with negligible velocity at constant rate m kg/s and sticks to the cart.
The velocity of the cart at time 
In the figure shown a long cart moves on a smooth horizontal surface due to an external constant force of magnitude F Initial mass of the cart is M0 and velocity is zero At t = 0 sand starts falling from a stationary hopper on to the cart with negligible velocity at constant rate m kg/s and sticks to the cart.
The velocity of the cart at time
physics-General
physics-
Two bodies have undergone an elastic one–dimensional collision along x–axis Figure is a graph of position versus time for these bodies and for their center of mass.
The mass of the body that was moving faster before the collision is ________ that of other body.
Two bodies have undergone an elastic one–dimensional collision along x–axis Figure is a graph of position versus time for these bodies and for their center of mass.
The mass of the body that was moving faster before the collision is ________ that of other body.
physics-General
physics-
Two bodies have undergone an elastic one–dimensional collision along x–axis Figure is a graph of position versus time for these bodies and for their center of mass.
Which line segment corresponds to the motion of the center of mass before and after the collision?
Two bodies have undergone an elastic one–dimensional collision along x–axis Figure is a graph of position versus time for these bodies and for their center of mass.
Which line segment corresponds to the motion of the center of mass before and after the collision?
physics-General
physics-
A disk A of radius r moving on perfectly smooth surface at a speed v undergoes an elastic collision with an identical stationary disk B. Find the velocity of the disk B after collision if the impact parameter is r/2 as shown in the figure
A disk A of radius r moving on perfectly smooth surface at a speed v undergoes an elastic collision with an identical stationary disk B. Find the velocity of the disk B after collision if the impact parameter is r/2 as shown in the figure
physics-General
physics-
A ball of mass 1kg strikes a heavy platform, elastically, moving upwards with a velocity of 5m/s. The speed of the ball just before the collision is 10m/s downwards. Then the impulse imparted by the platform on the ball is
A ball of mass 1kg strikes a heavy platform, elastically, moving upwards with a velocity of 5m/s. The speed of the ball just before the collision is 10m/s downwards. Then the impulse imparted by the platform on the ball is
physics-General
