Question Answers
Sahay Sir > Question Answers
A projectile is fired at an angle 30^∘ of to the horizontal such that the vertical component of its initial velocity is 80 m/s. Its time of flight is T. Its velocity at t= T/4 has a magnitude of nearly:
18
Oct
A projectile is fired at an angle 30^∘ of to the horizontal such that the vertical component of its initial velocity is 80 m/s. Its time of flight is T. Its velocity at t= T/4 has a magnitude of nearly: A very broad elevator is going up vertically with a constant acceleration of 2m/s^2. At [...]
Tags:
A very broad elevator is going up vertically with a constant acceleration of 2m/s^2. At the instant when its velocity is 4m/s a ball is projected from the floor of the lift with a speed of 4m/s ,
relative to the floor at an elevation of 30^o. The time taken by the ball to return the floor is (g = 10m/s^2 ) ,
The luminous dials of watches are usually made by mixing a zinc sulphide phosphor with an alpha particle emitter. The mass of radium (mass number 226, half-life 1620 years) that is needed to produce an average of 10 alpha particles per second for this purpose is
18
Oct
The luminous dials of watches are usually made by mixing a zinc sulphide phosphor with an alpha particle emitter. The mass of radium (mass number 226, half-life 1620 years) that is needed to produce an average of 10 alpha particles per second for this purpose is half-life 1620 years) that is The luminous dials of [...]
Two particles A and B projected simultaneously from a point situated on a horizontal place. The particle A is projected vertically up with a velcity vA while the particle B is projected up at an angle 30∘ with horizontal with velocity vB. After 5s the particles were observed moving mutually perpendicular to each other. The velocity of projection of the particle vA and vB respectively are:
18
Oct
Two particles A and B projected simultaneously from a point situated on a horizontal place. The particle A is projected vertically up with a velcity vA while the particle B is projected up at an angle 30∘ with horizontal with velocity vB. After 5s the particles were observed moving mutually perpendicular to each other. The [...]
Tags:
A very broad elevator is going up vertically with a constant acceleration of 2m/s^2. At the instant when its velocity is 4m/s a ball is projected from the floor of the lift with a speed of 4m/s ,
relative to the floor at an elevation of 30^o. The time taken by the ball to return the floor is (g = 10m/s^2 ) ,
Two particles are projected from the same point on ground simultaneously with speeds and 20m/s and 20/3–√ at angles 30^∘ and 60^∘ with the horizontal in the same direction. The maximum distance between them till both of them strike the ground is approximately (g=10m/s^2)
18
Oct
Two particles are projected from the same point on ground simultaneously with speeds and 20m/s and 20/3–√ at angles 30^∘ and 60^∘ with the horizontal in the same direction. The maximum distance between them till both of them strike the ground is approximately (g=10m/s^2) A very broad elevator is going up vertically with a constant [...]
Tags:
A very broad elevator is going up vertically with a constant acceleration of 2m/s^2. At the instant when its velocity is 4m/s a ball is projected from the floor of the lift with a speed of 4m/s ,
relative to the floor at an elevation of 30^o. The time taken by the ball to return the floor is (g = 10m/s^2 ) ,
A dip circle lies initially in the magnetic meridian. If it is now rotated through angle θ in the horizontal plane, then tangent of the angle of dip is changed in the ratio:
18
Oct
A dip circle lies initially in the magnetic meridian. If it is now rotated through angle θ in the horizontal plane, then tangent of the angle of dip is changed in the ratio: A dip circle lies initially in the magnetic meridian. If it is now rotated through angle θ in the horizontal plane then [...]
At a certain place, the horizontal component B0 and the vertical component V0 of the earth’s magnetic field are equal in magnitude . THe total intensity at the place will be
18
Oct
At a certain place, the horizontal component B0 and the vertical component V0 of the earth’s magnetic field are equal in magnitude . THe total intensity at the place will be At a certain place the horizontal component B0 and the vertical component V0 of the earth's magnetic field are equal in magnitude . THe [...]
A radioactive sample undergoes decay as per the following graph. At time t = 0, the number of undecayed nuclei is N0. Calculate the number of nuclei left after 1 h.
18
Oct
A radioactive sample undergoes decay as per the following graph. At time t = 0, the number of undecayed nuclei is N0. Calculate the number of nuclei left after 1 h. A radioactive sample undergoes decay as per the following graph. At time t = 0 the number of undecayed nuclei is N0. Calculate the [...]
A radioactive nuclide is produced at the constant rate of n per second (say, by bombarding a target with neutrons). The expected number N of nuclei in existence t s after the number
18
Oct
A radioactive nuclide is produced at the constant rate of n per second (say, by bombarding a target with neutrons). The expected number N of nuclei in existence t s after the number A radioactive nuclide is produced at the constant rate of n per second (say by bombarding a target with neutrons). The expected [...]
Which of the following relation is correct in magnetism ?
18
Oct
Which of the following relation is correct in magnetism ? Which of the following relation is correct in magnetism ? October 18, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
Consider the following reaction 1H2 + 1H2 gives 1He4 + Q If m(1H2) = 2.0141 u: m(2He4) = 4.0024 u, the energy Q released (in MeV) in this fusion reaction is
18
Oct
Consider the following reaction 1H2 + 1H2 gives 1He4 + Q If m(1H2) = 2.0141 u: m(2He4) = 4.0024 u, the energy Q released (in MeV) in this fusion reaction is Consider the following reaction 1H2 + 1H2 gives 1He4 + Q If m(1H2) = 2.0141 u: m(2He4) = 4.0024 u the energy Q released [...]