A man standing on horizontal smooth surface (consider air is absent but gravity is present). Choose the correct statement.
(A) He can jump in vertical direction
(B) He cannot move in horizontal direction
(C) He cannot fall in forward or backward direction
(D) All of these

Two persons, A of mass 60 kg and B of mass 40 kg , are standing on a horizontal platform of mass 50 kg . The platform is supported on wheels on a horizontal frictionless surface and is initially at rest. Consider the following situations. (i) Both A and B jump from the platform simultaneously and in the same horizontal direction. (ii) A jumps first in a horizontal direction and after a few seconds B also jumps in the same direction. In both the situations above, just after the jump, the person ( A or B ) moves away from the platform with a speed of 3 m//s relative to the platform and along the horizontal. In situation (i), just after both A and B jump from the platform, velocity of centre of mass of the system ( A, B and the platform) is

Monochromatic rays of intensity I are falling on a metal plate of surface area A placed on a rough horizontal surface at certainn angle theta as shown in figure. Choose correct statement (s) based on above information a) There is a value of θ for which plate will not move however high the intensity of radiation is b) Plate will not move if plate if perfectly reflecting irrespective of the value of intensity c) If rays are falling perpendiculars to surface plate will not have d) none of these

Consider the following statement A and B and identify the correct answer A) Primary waves travels in a medium with speed of light in all directions. B) Secondary waves travels in backward direction only but not with speed of light

A particle having a mass of 10^(-2) kg carries a charge of 5 xx 10^(-8) C . The particle is given an initial horizontal velocity of 10^(5) msec^(-1) in the presence of electric field vec(E) and magnetic field vec(B) . To keep the particle moving in a horizontal direction, it is necessary that A. vec(B) should be perpendicular to the direction of velocity and vec(E) should be along the direction of velocity B. Both vec(B) and vec(E) should be along the direction of velocity C. Both vec(B) and vec(E) are mutually perpendicular and perpendicular to the direction of velocity D. vec(B) should be along the direction of velocity and vec(E) should be perpendicular to the direction of velocity

A ball of mass m moving horizotally which velocity u hits a wedge of mass M . The wedge is situated on a smooth horizontal source. If after striking with wedge the ball starts moving in vertical direction and the wedge starts moving in horizotal plane. calculate a. the velocity of wedge V . b. the velocity (v) at which the ball moves in vertical direction. c. the impulse imparted by the ball on the wedge. d. the coefficient of restitution e=?

Block of mass 'm' is sliding up on the smooth incline plane, with some constant velocity. Now, on the block match the magnitude value of the forces on 'm' in the given directions take the components of all the forces in the given direction) {:("Column - I","Column -II"),("A) Net force component is horizontal direction ","P) zero"),("B) Net - force compnent in vertical direction", "Q) " mg sin theta cos theta),("C) Net force component along the incline plane ","R)" mg sin theta),("D) Net force component perpendicular to the incline plane ","S) " mg (1-cos^(2) theta)):}

Two parallel long straight conductors lie on a smooth horizontal surface. Two other parallel conductor rest on them at right angles so as from B exits vertical. A uniform magnetic field B exists a vertical direction. Now all the four conductors stock moving outwards with a constant velocity v. The induced emf e and induced current i will vary wide time t as

A particle is projected in air at some angle to the horizontal, moves along parabola as shown in figure where x and y indicate horizontal and vertical directions, respectively . Shown in the diagram, direction of velocity and acceleration at points A, B and C.

A man standing on a moving escalator, completes a certain distance in time t_(1) . If the escalator does not move then man covers this distance in time t_(2) by walking. (i) How much time will he take to cover the same distance if he move on the moving escalator in the same direction ? (ii) How much time will he take to cover the same distance if he move on the moving escalator in the opposite direction ?

A man standing on a inclined plain observes rain is falling verticaly. When he starts moving down the inclined plain with velocity v=6m//s observes rain hitting him horizontally. The actual velocity of rain is