Final-Exam-a-Fall-2021(1)

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PHYS 2425 Final Exam-Fall 2021 1. Which of the following five coordinate versus time graphs represents the motion of an object whose speed is constant and negative? A) I B) II C) III D) IV E) V 2. A car travels 20 kilometers at an average speed of 40 km/h and then travels another 20 kilometers at an average speed of 20 km/h. The average speed of the car for this 40 km trip is: A) 17 km/h B) 27 km/h C) 53 km/h D) 63 km/h E) 87 km/h 3. A cannon fires a ball vertically upward from the Earth’s surface. Which one of the following statements concerning the net force acting on the ball at the top of its trajectory is correct? A) The net force on the ball is instantaneously equal to zero newtons at the top of the flight path. B) The direction of the net force on the ball changes from upward to downward. C) The net force on the ball is less than the weight, but greater than zero newtons. D) The net force on the ball is greater than the weight of the ball. E) The net force on the ball is equal to the weight of the ball.

4. The graph shows the velocities of two objects as a function of time. During the intervals A, B, and C indicated, net forces F A , F B and F C act on the two objects, respectively. If the objects have equal mass, which one of the following choices is the correct relationship between the magnitudes of the three net forces? A) F A > F B = F C B) F C > F A > F B C) F A < F B < F C D) F A = F B = F C E) F A = F C > F B 5. A crate is moving on a horizontal rough surface and a woman pulls on it with a 10-N force. Rank the situations shown below according to the magnitude of the kinetic friction exerted by the surface on the crate, least to greatest. A) 1, 2, 3 B) 2, 1, 3 C) 2, 3, 1 D) 3, 2, 1 E) 1, 3, 2

6. A 70-N block and a 35-N block are connected by a string as shown. If the pulley is massless and the surface has a coefficient of kinetic friction μ k = 0.2 , the magnitude of the acceleration of the 35-N block is (consider g=10 m/s 2 ): A) 2.0 m/s 2 B) 3.3 m/s 2 C) 4.0 m/s 2 D) 6.5 m/s 2 E) 9.8 m/s 2 7. A 1-N pendulum bob is held at an angle  from the vertical by a 2-N horizontal force F as shown. The tension in the string supporting the pendulum bob is: A) 2/ √ 5  B) 2 √ 5 N C) √ 5 N D) 1 N E) none of these 8. A large cannon is fired from ground level over level ground at an angle of 30  above the horizontal. The bullet speed is 900 m/s. Neglecting air resistance, the projectile will reach its higher position in (Take g=10 m/s 2 ): A) 30 s B) 35 s C) 40 s D) 45 s E) 50 s 9. A 0.50-kg object moves in a horizontal circular track with a radius of 5.0 m. An external force

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of 3.0 N, always tangent to the track, causes the object to speed up as it goes around. The work done by the external force as the mass makes one revolution is: A) 7.5 J B) 24 J C) 47 J D) 94 J E) 120 J 10. A 0.5-kg block slides along a horizontal frictionless surface at 2 m/s. It is brought to rest by compressing 5 cm a very long spring. The spring constant 800 N/m is: A) 80 N/m B) 200 N/m C) 400 N/m D) 600 N/m E) 800 N/m 11. In the Fig., a small block of mass m = 0.032 kg can slide along the frictionless loop-the-loop, with loop radius R = 10 cm. The block is released from rest at point P , at height h = 19 R above the bottom of the loop. What is the block velocity at point Q ? (Take g =10 m/s 2 ) A) 40 m/s B) 140 m/s C) 0.4 m/s D) 6.0 m/s E) 4.0 m/s 12. A 4.0-N puck is traveling at 3.0 m/s. It strikes an 8.0-N puck, which is stationary. The two pucks stick together. Their common final speed is (Take g=1-m/s 2 ): A) 1.0 m/s B) 1.5 m/s C) 2.0 m/s D) 2.3 m/s E) 3.0 m/s 13. This graph shows the angular position of an object as a function of time. What is its average

angular velocity between t = 5 s and t = 9 s? A) 3 rad/s B) −3 rad/s C) 12 rad/s D) −12 rad/s E) Need additional information. 14. Three identical uniform rods are each acted on by two or more arbitrary forces, all perpendicular to the rods. Which of the rods could be in static equilibrium if an additional force is applied at the center of mass of the rod? A) Only 1 B) Only 2 C) Only 3 D) Only 1 and 2 E) All three 15. An ice skater with rotational inertia I 0 is spinning with angular speed  0 . She pulls her arms in, thereby increasing her angular speed to 4  0 . Her rotational inertia is then: A) I 0 B) I 0 /2 C) 2 I 0 D) I 0 /4 E) 4 I 0

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