Physics Exam

50. Which one of the following defense technologies is correctly matched with its working principle?

A. A radar is a rocket propelled weapon designed to deliver an explosive weapon with a great accuracy at high speed.
B. Missiles radiate electromagnetic signal and examine the echo received to identify the location of the target.
C. Drones radiate electromagnetic signal and examine the echo received to identify the location of the target.
D. Infrared device uses heat emission to identify objects that cannot be detected using available light sources.

51. Which one of the following phenomena occurs during change of phases of a matter? During a phase change from

A. solid to liquid, heat energy is released from a substance while its temperature remains constant.
B. gas to liquid, heat energy is absorbed by a substance while its temperature remains constant.
C. liquid to gas, heat energy is absorbed by a substance while its temperature remains constant.
D. liquid to solid, heat energy is released from a substance while its temperature changes uniformly.

52. Assume that a ball is thrown horizontally from a building of height h above the ground with initial speed Vo. Which one of the following statements is correct about the motion of the object?

A. Its vertical component velocity remains constant.
B. Its horizontal component acceleration is zero.
C. Its horizontal component velocity uniformly increases.
D. Its vertical component acceleration is zero.

53. A projectile is thrown from a level ground with an initial velocity V_o making an angle of θ above the horizontal. If the maximum height covered by the projectile is H, what is the horizontal range of the projectile in terms of H and θ?

A. (Htanθ)/4
B. H/(tanθ)
C. H/4tanθ)
D. 4H/(tanθ)

54. Four point masses m₄ = 4 kg, m₂ = 1 kg, m₃ = 3 kg and m₁ = 5 kg are attached to a massless rod which lies on the x-axis as shown in the figure below. How much is the moment of inertia of the system about the y-axis?

A. 184 kg·m²
B. 187 kg·m²
C. 84 kg·m²
D. 190 kg·m²

55. Which one of the following statements is a necessary condition for an object to be in linear equilibrium?

A. The linear acceleration of the object is zero.
B. The net force acting on the object is non-zero constant.
C. The linear acceleration of the object is non-zero constant.
D. The linear speed of the object is constant.

56. When an object tends to slide over the surface of another object, tiny bumps at the surface of the two objects knocking and locking together. This causes

A. electrostatic force.
B. gravitational force.
C. frictional force.
D. normal force.

57. Suppose a ball is thrown vertically upward and after reaching a maximum height, it returns back to its initial position. Which of the following statement is correct about energy changes and work done on the ball?

A. On its way down, change in its potential energy is positive.
B. On its way up, change in its kinetic energy is positive.
C. On its way up, work done by gravity is positive.
D. On its way down, work done by gravity is positive.

58. The mechanical energy of an oscillating object at any point through its path is equal to

A. the sum of its kinetic and internal energies.
B. the sum of its kinetic and potential energies.
C. the difference between its kinetic and potential energies.
D. the sum of its potential and internal energies.

59. A 2 kg object accelerates with 1.5 m/s² to the right on a horizontal frictionless surface under the action of two horizontal forces, F₁ and F₂ as shown in the figure below. What should be the magnitude of F₁?

A. 1 N
B. 2 N
C. 4 N
D. 3 N

60. A tennis ball of mass 0.10 kg traveling horizontally at 40.0 m/s is struck back by a racket. If the ball returns back with a speed of 30.0 m/s in the opposite direction, what is the magnitude of the impulse delivered to the ball by the racket?

A. 4.0 kg m/s
B. 3.0 kg m/s
C. 1.0 kg m/s
D. 7.0 kg m/s

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Physics Exam: Part 4

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