# Phys101 Second Major-152 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 2016 Page: 1

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1 Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: 1 Q1. Figure 1 shows two masses; m 1 = 4.0 and m = 6.0 which are connected by a massless rope passing over a massless and frictionless pulley. Mass m 1 moves on a frictionless incline with θ 30. Find the magnitude of the acceleration of mass m. A) 3.9 m/s Figure 1 B) 9.8 m/s C) 7.9 m/s D) 1. m/s E) 5.5 m/s T m 1 gsin30 = m 1 a m g T = m a a = (m m 1 sin30)g m 1 + m = 3.9 m/s Q. A ball is thrown vertically upward. Neglecting air resistance, which one of the following statements is FALSE. A) The potential energy of the earth-ball system decreases as the ball is going up. B) The kinetic energy of the ball decreases while the ball is going up. C) The sum of the kinetic energy of the ball and potential energy of ball-earth system is constant. D) The potential energy of the earth-ball system decreases as the ball is coming down. E) The kinetic energy of the ball increases when the ball is coming down. A c-0-n-15-s-0-e-0-fg-1-fo-0

2 Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: Q3. Figure shows the speed V x of a 3.00 mass as a function of time due two constant forces F and F causing the mass to slide on a frictionless horizontal surface. Force F = 7.00 N and 1 1 is along the positive x-direction and F = 6.00 N is in the xy-plane. Find the angle between the direction of F and the positive x axis. Figure A) 80.4 B) 89.5 C) 39.6 D) 71.4 E) 3.3 F 1 + F cosθ = ma a =.66 m/s θ = 80.4 Q4. Figure 3 shows three connected blocks by two cords and being pulled across a horizontal frictionless surface by a constant horizontal force F = 100 N. Find the tension in the cord between the 5 and 10 blocks. A) 50 N Figure 3 B) 10 N C) 90 N D) 0 N E) 0 a = = 5 m/s 100 T = 10 a T = 50 N c-0-n-15-s-0-e-0-fg-1-fo-0

3 Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: 3 Q5. In Figure 4, two masses m 1 =.00 and m = 3.00 are connected by a massless string passing over a massless and frictionless pulley. Mass m 1 moves on a horizontal surface having a coefficient of kinetic friction μ k= and is subject to a constant force F = 0.0 N. Find the magnitude of the acceleration of m. A) 1.46 m/s Figure 4 B).7 m/s C) 9.80 m/s D) 4.60 m/s E) 0 T 1 Fcos30 μ k (m 1 g Fsin30) = m 1 a T (g (0)(0.5) = R (1) m g T = m a 9.4 T = 3 a () (1) + () = 5a a = 1.46 m/s Q6. A man riding a bicycle with a 100 total mass is performing horizontal circles on flat track. If the coefficient of static friction between the tires and track is 0.600, find the smallest radius the man can make when travelling at a speed of 10.0 m/s. A) 17.0 m B) 10.3 m C) 13.6 m D) 30. m E) 3.5 m f s = μ s mg = mv r r = v μ s g = 17 m c-0-n-15-s-0-e-0-fg-1-fo-0

4 Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: 4 Q7. A small block of mass m 1 = 1.0 is put on the top of a large block of mass m = 4.0. The large block can move on a horizontal frictionless surface while the coefficients of friction between the large and small blocks are μ s= 0.60 and μ k= 0.4. A horizontal force F = 5.0 N is applied to the small block (See Figure 5). Find the acceleration of the large block m. A) 1.0 m/s B).7 m/s Figure 5 C) 9.8 m/s D) 4.6 m/s E) 1.3 m/s f s = μ s mg = 5.88 > 5 N m 1 is not moving F S = (m 1 + m )a a = 1 m/s Q8. In Figure 6 two forces F 1 and F are applied to a box of mass m as it slides at constant velocity over a frictionless horizontal surface. Now by decreasing the angle while keeping the magnitude of F 1 and the box velocity constant, then which one of the following statements is CORRECT. A) The magnitude of F increases while the magnitude of the Normal force increases. Figure 6 B) The magnitude of F increases while the magnitude of the Normal force decreases. C) The magnitude of F decreases while the magnitude of the Normal force increases. D) The magnitude of F is constant while the magnitude of the Normal force decreases. E) The magnitude of F is constant while the magnitude of the Normal force increases. N = mg F 1 sin30 c-0-n-15-s-0-e-0-fg-1-fo-0

5 Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: 5 Q9. Figure 7 shows the force on a 3.0 object as a function of position. If an object is moving at.5 m/s when it is located at x =.0 m, find its speed when located at x = 8.0 m. A) 3.3 m/s Figure 7 B).7 m/s C) 5.4 m/s D) 0 E) 1.9 m/s W = K = Area = 6.5 J V f = V f = 3.3 m/s Q10. An object of mass 10 is moving in a horizontal circular path of radius 0.50 m with a constant speed of 4.0 m/s. Find the work done by the centripetal force on that object during one full cycle. A) 0 B) 10 J C) 60 J D) 40 J E) 80 J W = F d = 0 d = 0 c-0-n-15-s-0-e-0-fg-1-fo-0

6 Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: 6 Q11. A constant force F (6.0 iˆ 9.0 ˆj ) N acts on a.0 block placed on a frictionless horizontal surface. Initially the block is at rest at point A having coordinates (1.0 m, 3.0 m). If the force causes the block to be displaced from point A to point B having coordinates (4.0 m, 4.0 m) on an xy-coordinate system, find the block s final speed. W = K A) 3.0 m/s B) 5.0 m/s C) 7.0 m/s D) 4.0 m/s E).0 m/s F d = (6)(3) (9)(1) = 1 mv f 0 v = 3 m/s Q1. An elevator cab is moving upward at a constant speed of 4.00 m/s. The power of the motor driving the elevator cab is 150 kw. Find the mass of the elevator cab. A) B) C) D) E) P = F v = mg v m = = Kg c-0-n-15-s-0-e-0-fg-1-fo-0

7 Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: 7 Q13. In Figure 8, A.00 block situated on a rough incline is connected to a spring of negligible mass and spring constant 100 N/m. The block is released from rest when the spring is unstretched. If the pulley is massless and frictionless and the block moves 0.0 cm down the incline before coming to rest, then find the coefficient of kinetic friction between the block and incline. A) B) 0.35 Figure 8 C) D) E) K + U g + U s = W nc K = 0 U g = mgdsin37 =.36 U s = 1 kx = U s = 1 kx = W nc = μ k mgcosθd = 3.13 μ k μ k = Q14. A horizontal spring is fixed at one end. If it requires 6.0 J of work to stretch the spring by.0 cm from its equilibrium length, how much more work will be required to stretch it an additional 4.0 cm? A) 48 J B) 54 J C) 6.0 J D) 1 J U s = 6 = 1 kx k = N/m W s = 1 k(x f x i ) = 48 J c-0-n-15-s-0-e-0-fg-1-fo-0

8 Phys101 Second Major-15 Zero Version Coordinator: Dr. W. Basheer Monday, March 07, 016 Page: 8 Q15. A 3.00 box starts from rest and slides down an incline. The incline is m high and the angle of inclination is 30.0 o. If the box experiences a constant friction force of magnitude 5.00 N, then find the speed of the box as it reaches the bottom of the incline. A).54 m/s B) 6.47 m/s C) 3.96 m/s D) 5.58 m/s E) 8.76 m/s K + U g = W nc 1 mv mgh = F h sin30 v =.54 m/s c-0-n-15-s-0-e-0-fg-1-fo-0

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