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Two particles are moving with velocities v1 = i – tj + k and v2 = ti + tj + 2k m/s respectively. Time at which they are moving perpendicular to each other is ……..(second) Two particles are moving with velocities v1 = i - tj + k and v2 = ti + tj + [...]

The diagram shows the variation of 1/v (where v is velocity of the particle) with respect to time. At time t = 3 s using the details given in the graph, find the instantaneous acceleration (in m/s^2) find the instantaneous acceleration (in m/s^2) The diagram shows the variation of 1/v (where v is velocity of [...]

A lift performs the first part of its ascent with uniform acceleration, a, and the remaining with uniform retardation, 2a. If, t, is the time of ascent, the depth of the shaft is at^2/n. Find value of n. 2a. If A lift performs the first part of its ascent with uniform acceleration A) and the [...]

Speed time graph of two cars A and B approaching towards each other is shown in figure. Initial distance between them is 60 m. The two cars will cross each other after t seconds. Find value of it t. Speed time graph of two cars A and B approaching towards each other is shown in [...]

If a particle takes t second less and acquire a velocity of vms^−1 more in falling through the same distance on two planets where the accelerations due to gravity are 2g and 8g respectively, then v=x gt. Find value of x If a particle takes t second less and acquire a velocity of vms^−1 more [...]

The core of a toroid having 3000 turns has inner and outer radii of 11 cm and 12 cm respectively. THe magnetic field in the core for a current of 0.70 A is 2.5 T. What is the relative permeability of the core? joining the two poles the magnetic field will be Zero ? Two [...]

The magnetizing field of 1600 A/m produces a magnetic flux of 2.4 x 10^-5 Weber in a bar of ioron of cross – section 0.2 cm^2. calculate relative permeability, intensity of magnetization and susceptibility of the bar . intensity of magnetization and susceptibility of the bar . The magnetizing field of 1600 A/m produces a [...]

A magnet weighs 75 g and its magnetic moment is 2 x 10^-4 Am^2. If the density of the material of the magnet is 7.5 x 10^3 kg/m^3, calculate the intensity of magnetization . A magnet weighs 75 g and its magnetic moment is 2 x 10^-4 Am^2. If the density of the material of [...]

A car starts moving along a line, first with acceleration a = 5m/s^2 starting from rest then uniformly and finally decelerating at the same rate till it comes to rest. The total of motion is 25s. The average speed during the time is 20m/s. The particle moves uniformly for (2.5x) second. Find the value of [...]

A bar magnet of length 8cm and having a pole strengh of 1.0Am is placed vertically on a horizontal table with its north pole on the table. A neutral point is found on the table at a distance of 6.0 cm south of the magnet. Calculate the earth’s horizontal magnetic field. joining the two poles [...]