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Unformatted text preview: Old Exam. Questions Ch. 9-Dr. Gondal (Phys. 101) T082 Q5. A projectile of mass m = 0.200 kg is fired at an angle of 60.0 degrees above the horizontal with a speed of 20.0 m/s. Find the work done on the projectile by the gravitational force during its flight from its firing point to the highest point on its trajectory. (A: 30.0 J) Q6. A 0.500-kg block is pushed against a horizontal spring fixed at one end (the block is NOT attached to the spring), compressing the spring 10.0 cm. The spring has a spring constant of 1.00 x 10 2 N/m. The block lies on a horizontal floor having a coefficient of kinetic friction k = 0.200. Find the total distance traveled by the block after being released from rest. (A: 51.0 cm) Q7.A simple pendulum consists of a 2.00 kg mass attached to a 1.00 m long light string. It is given an initial speed of 0.500 m/s at A where the pendulum makes an angle with the vertical as shown in Fig.1. If its speed at the lowest point B is 1.70 m/s, find the value of the angle . (A: 30.1 degrees) Q8. A ball of mass m, attached at one end of a massless string of length L, rotates in a vertical circle fast enough to prevent the string from going loose at the top of the circle. Neglecting air resistance, during this motion, which ONE of the following statements is WRONG: ( A: Change in mechanical energy is not zero.) T081 Q5.: A 2-kg object is dropped vertically from rest. After falling a distance of 50 m, it has a speed of 25 m/s. Calculate the work done by the air resistance on the object during this fall.( Ans: , # 355 J) Q6.: A spring with spring constant k = 106 N/m is attached to the top of a frictionless 30 incline as shown in Figure 2. The distance between the lower end of the incline and the relaxed end of the spring is 1 m. A 1-kg block is pushed against the spring until the spring is compressed by 0.2 m and released from rest. Find the speed of the block when it reaches the lower end of the incline. (ignore the size of the block). (Ans: 4.0 m/s) Q7. A projectile is fired from a height of 25 m with a speed of 20 m/s as shown in Figure 3. Find its speed when it hits the ground. Ignore air resistance. (Ans: 30 m/s) Q8.: As an object moves from point A to point B, only two forces act on it: one force is conservative and does 10 J of work, the other is non conservative and does 20 J of work. What happens to the energy of the object between points A and B? (Ans: Kinetic energy decreases, mechanical energy decreases.) T072 Q#9: A sulfur dioxide molecule SO 2 consists of a Sulfur atom (M = 32 u) located at the origin with two Oxygen atoms each of mass (m = 16 u) bound to it as in Fig 4 . The angle between the two bonds is 120. If each bond is 0.1432 nm long, what is the location of the center of mass of the molecule (x,y)? (Ans: (0.0358, 0) nm) Q10. A 10.0 kg toy car is moving along the x axis. The only force F x acting on the car is shown in Fig. 5 as a function of time (t)....
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