New PDF release: Objective Physics: for Medical and Engineering Entrance
By S.O. Pillai
This quantity is floated after going although the syllabi and issues prescribed by means of the appointed firms of the respective areas. The final one or chapters can be of a few use to the GATE aspirants. The salient positive factors comprise: item kind questions with keys in lots of very important components of Physics can be found; on the finish of every bankruptcy, difficulties chosen from previous questions papers are handled with suggestions; vital desk of actual constants also are supplied; approximately 800 goal questions with keys are supplied; and, round three hundred difficulties were handled with options.
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Extra info for Objective Physics: for Medical and Engineering Entrance Examination
Solution: 1 1 m1v12 = mv2 2 2 2 2 (m1v1 ) 2 (m2 v2 ) 2 = m1 m2 1/ 2 m1v1 m1 1 = = m2 v2 m2 4 FG IJ H K m1v1 : m2v2 = 1 : 2 FG IJ H K 1/ 2 = 1 2 Ans. 4. What will be the total energy of an artificial satellite circling round the earth in an orbit of radius R? E. E. E. = GMm 1 GMm – R R 2 E=– GMm 2R Ans. 32 OBJECTIVE PHYSICS 5. A particle performs uniform circular motion with an angular momentum I. If the frequency of particle’s motion is doubled and its kinetic energy of rotation is halved, calculate the angular momentum.
Of this equation within brackets is a correction term for taking into account the (a) exact value of angle of contact (b) viscous property of water (c) vapour pressure (d) spherical shape of the surface. 16. Liquid drops always occupy minimum surface area on account of (a) viscosity (b) surface tension 26 17. 18. 19. 20. OBJECTIVE PHYSICS (c) refractive index (d) gravitational energy. T. force (b) predominant gravitational force (c) both (a) and (b) (d) colour of mercury. Small liquid drops assume spherical shape because (a) gravitational force acts upon the drop (b) atmospheric pressure exerts a force on a liquid drop (c) volume of spherical drop is minimum (d) liquid tends to have the minimum surface area due to surface tension.
Calculate centripetal force acting on it. Solution: mv 2 r Angular momentum = mv r = I Centripetal force = mv = I r Thus centripetal force, F= F= m 2 v2 I2 = 2 mr r mr I2 mr 3 Ans. 8. What amount of energy will be liberated if 1000 droplets of water each 10–6 m in diameter coalesce to form one large spherical drop. T. of water = 72 × 10–3 N/m? 036 × 10–12 joule Ans. 9. An ice-berg floats in fresh water with a part of it outside the water surface. If the density of ice is 717 kg/m3 and that of water be 1000 kg/m3, compute the fraction of volume of ice-berg below water surface is formed.
Objective Physics: for Medical and Engineering Entrance Examination by S.O. Pillai