13. A particle of mass 100 g is thrown vertically upwards with a speed of 5...

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13. A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. the work done by the force of gravity during the time the particle goes up is Statement -1: If stret amount, worked done on S,, will be more than that of S, Statement- 2:k, <k, 23. A (2012) fr (2006) th 1) Statement-1 is false, statement-2 is true 1) 0.5 J 2) -0.5 J 3)-1.25 J 4) 1.25 J 2) Statement -1 is true, statement -2 is false 14. The potential energy of a1 kg particle free move along the x-axis is given by 3) Statement-1 is true, statement-2 is true, statement-2 is the correct explanation of statement -1 V(x)= 4 J. The total mechanical 4) Statement -1 is true, statement-2 is true, 11 energy of the particle 2 J. Then, the maximum statement-2 is not the correct explanation of 16 speed (in m/s) is (2006) statement-1 19. When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx' where a and b are constants. The 21 1) 2 2) 3/2 3) V2 4) 1/2 15. An athlete in the olympic games covers a distance of 100m in 10s. His kinetic energy work done in stretching the unstretched rubber-band by L is: 1. can be estimated to be in the range (2008) (2014) 1 al bL 1) 2 2 1) 200J-500J 2) 2x10 J-3x10 2) aL? + bL 3) 20,000J-50,000J 4) 2,000J-5,000J . al? bL 16. A block of mass 0.50 kg is moving with a speed 3) (aL + bL³ 2 3 of 2.00 m/s on a smooth surface. It strikes another mass 1.00 kg and then they move 20. A particle of mass 'm' moving in x-direction with speed '2v' is hit by a particle of mass '2m' moving in y-direction with speed 'v'. If the collision is perfectly inelastic the percentage of the energy during the collision is close to (2015) together as a single body. The energy loss during the collision is (2008) 2. 1) 0.16 J 2) 1.00 J 3) 0.67 J 4) 0.34 J ON Ma 17. The pontential energy function for the force 1) 62% 2) 44% 3) 50% 4) 56% between two atoms in a diatomic molecule 21. A person trying to lose weight by burning fat lifts a mass of 10kg upto a height of Im 1000 times. Assume that the potential energy lost each time he lowers the mass is dissipated. How much fat will he use up considering the work done only when the weight is lifted up Fat supplies 3.8 x 10'J of energy per kg which is converted to mechanical energy with a 20% efficiency rate. Take g = 9.8ms 1) 12.89 x 10 kg 3) 6.45 x 10 kg 22. A body of mass m 10-2 kg is moving in a medium and experiences a frictional force F=-kv. Its initial speed is v-10ms-, If, after is approximately given by a U (X) =U(X)=12 x where a and b are %3D %3D constants and X is the distance between the atoms. If the dissociation energy of the molecule is D=[U(X=D00)-U t equilibrium I, D is (2010) 62 1) 2a b2 2) 12a b² 3) 4a b² 4)- ба (2016) 2) 2.45 x 10 kg 4) 9.89 x 10 kg 18. This question has statement 1 and sta tement 2. Of the four choices given after the statements, choose the one that best describes the two statements. If two springs S, and S, of the force constants k, and k,, respectively, are stretched by the same force, it is found that more work is done on spring S, than on spring S,. 10s, its energy is 2. mv the value of k will be 1) 10 kgm 3) 10-3 kgm- (2017) 2) 10- kgm 's 4) 10 kgs 13. A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. the work done by the force of gravity during the time the particle goes up is Statement -1: If stret amount, worked done on S,, will be more than that of S, Statement- 2:k, <k, 23. A (2012) fr (2006) th 1) Statement-1 is false, statement-2 is true 1) 0.5 J 2) -0.5 J 3)-1.25 J 4) 1.25 J 2) Statement -1 is true, statement -2 is false 14. The potential energy of a1 kg particle free move along the x-axis is given by 3) Statement-1 is true, statement-2 is true, statement-2 is the correct explanation of statement -1 V(x)= 4 J. The total mechanical 4) Statement -1 is true, statement-2 is true, 11 energy of the particle 2 J. Then, the maximum statement-2 is not the correct explanation of 16 speed (in m/s) is (2006) statement-1 19. When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx' where a and b are constants. The 21 1) 2 2) 3/2 3) V2 4) 1/2 15. An athlete in the olympic games covers a distance of 100m in 10s. His kinetic energy work done in stretching the unstretched rubber-band by L is: 1. can be estimated to be in the range (2008) (2014) 1 al bL 1) 2 2 1) 200J-500J 2) 2x10 J-3x10 2) aL? + bL 3) 20,000J-50,000J 4) 2,000J-5,000J . al? bL 16. A block of mass 0.50 kg is moving with a speed 3) (aL + bL³ 2 3 of 2.00 m/s on a smooth surface. It strikes another mass 1.00 kg and then they move 20. A particle of mass 'm' moving in x-direction with speed '2v' is hit by a particle of mass '2m' moving in y-direction with speed 'v'. If the collision is perfectly inelastic the percentage of the energy during the collision is close to (2015) together as a single body. The energy loss during the collision is (2008) 2. 1) 0.16 J 2) 1.00 J 3) 0.67 J 4) 0.34 J ON Ma 17. The pontential energy function for the force 1) 62% 2) 44% 3) 50% 4) 56% between two atoms in a diatomic molecule 21. A person trying to lose weight by burning fat lifts a mass of 10kg upto a height of Im 1000 times. Assume that the potential energy lost each time he lowers the mass is dissipated. How much fat will he use up considering the work done only when the weight is lifted up Fat supplies 3.8 x 10'J of energy per kg which is converted to mechanical energy with a 20% efficiency rate. Take g = 9.8ms 1) 12.89 x 10 kg 3) 6.45 x 10 kg 22. A body of mass m 10-2 kg is moving in a medium and experiences a frictional force F=-kv. Its initial speed is v-10ms-, If, after is approximately given by a U (X) =U(X)=12 x where a and b are %3D %3D constants and X is the distance between the atoms. If the dissociation energy of the molecule is D=[U(X=D00)-U t equilibrium I, D is (2010) 62 1) 2a b2 2) 12a b² 3) 4a b² 4)- ба (2016) 2) 2.45 x 10 kg 4) 9.89 x 10 kg 18. This question has statement 1 and sta tement 2. Of the four choices given after the statements, choose the one that best describes the two statements. If two springs S, and S, of the force constants k, and k,, respectively, are stretched by the same force, it is found that more work is done on spring S, than on spring S,. 10s, its energy is 2. mv the value of k will be 1) 10 kgm 3) 10-3 kgm- (2017) 2) 10- kgm 's 4) 10 kgs