PULLA EDU APP JEE MAIN ADVANCED

Position Path length Displacement  If one or more coordinates of an object change with time, the object is in motion. Otherwise, the object is said to be at rest. For describing motion in one dimension, we need only one axis. To describe motion in two/three dimensions, we need a set of two three axes. Consider the motion of a car along a straight line. To describe motion along a straight line, we can choose an axis, say X-axis. We then measure the position of the object with reference to a conveniently chosen origin, say O, as shown in Fig. 3.1. Positions to the right of O are taken as positive and to the left of O, as negative. Following this convention, the position coordinates of point P and Q in Fig. 3.1 are +360 m and +240 m. Similarly, the position coordinate of point R is -120 m. x axis origin and position of car at different times Motion of an object can be represented by a position-time graph. For motion along a straight line, say X-axis...

CHAPTER 3 MOTION IN A STRAIGHT LINE INTRODUCTION • Motion is change in position of an object with time, body is said to be in motion if it continuously changes its position w.r.t any fixed point. Point objects: When the size of the object is much smaller than the distance it moves in a reasonable duration of time, the size of objects can be neglected and they can be considered as point-like objects without much error. Eg; 1) planetary motions. size of the planet is ignored compared with the size of the orbit. 2) Length of a bus may be neglected compared with the length of the road. Motion in 1, 2 & 3 dimensions Study of motion of objects along a straight line, is known as rectilinear motion. One dimensional: If the motion of a body is confined to one direction. eg: an ant moving on a stretched wire, a train running on straight rails, a bus running on a straight road. Two dimensional: If a body is free to move in any direction in a plane surface. eg: an ant moving on a table, mo...

Uses : 1) To find the displacement. 2) To find the velocity at any time. 3) To find the acceleration at any time. 4) To know the nature of motion. Displacement from velocity - time graph The figure shows v - t graph of uniformly accelerated object. v, and v, are V m/sec the velocities corresponding to the points P, and P, at time t, and t, respectively. The 2. shaded area gives the displacement in the time interval t, - t,.

with hydrogen at I atm rogen Calculate the volume of the balloon when a height of it rises to 2b00 m where ha atmospheric pressure 0.8 atm. Assume that is const is temp Ans. 218.75L 600 em of agas as measured at 27e is heated to 127°c keeping the The pressure calculate the volume of the const. increase in gas リュ v, X T2 3 600 cm x 4o0k T 300K * 800 cm3. Increase in volume - 860 - 300 200 cm At what temp will the volume of a double itself, pressure gas at ooc Remaining const. Let the volume be Uml. 2 = 2 7, 20'c = 213 *. = ? = Uml V2 Te Iz = x T, = 2 VX2253 = 546' 2 =• A sample of ņ gas occupies & ļ at 190mm pressu lle What would be volume of the sample at latm pressure if temp. is Const 2. kept Pv. P2 V₂ PI V, P2 190 Mom X 54 760 mm ス.25 人 • A sample of gas ocupus 100 h at Ibar presso is and at o'c. what adde tional pressure required to reduce the gas volume to 5h at the same coup Pv, P2 U2 ibar x tool 5 L 20 bay = Additional pressure = 20-1 = 19 bar A vessel of 120 ml ...

Previous Knowledge › ‘Physical quantities’ are of two types- ‘Base’ or ‘Fundamental  quantity’ and ‘Derived quantities’.  › We have seven fundamental quantities- “Length, Mass, Time,  Electric current, Thermodynamic Temperature, Amount of  substance, Luminous intensity”.  DIMENSIONS OF PHYSICAL QUANTITIES All physical quantities can be measured and expressed in terms of  the seven fundamental or base quantities. we call these base  quantities as the seven dimensions of the physical world, which are  denoted with square brackets [ ]. Thus, length has the dimension [L], mass [M], time [T], electric current [A], thermodynamic temperature [K], luminous intensity [cd], and amount of substance [mol]. Let us start the dimension of a physical quantity with a simple  example-‘Area’ We know that Area is a derived quantity, so that we can express Area of an object as the product of length and breadth, or two lengths.  ie Area=Length×Breadth In dime...