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exam physics 1

ohassouneh01
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  1. Q1) A 2.0-kg particle is suspended(مُعلّق) by a string from the ceiling ((سقْف of an elevator. The tension in the string is 20 N. The acceleration (in m/s2) of the elevator is: • 0.20, upward • 0.20, downward • 9.8, upward • 2.0, upward • 2.0, downward

  2. Q2) A block slides on a rough 30o-incline with an acceleration of 2.0 m/s2. The coefficient of kinetic friction μk between the block and the surface of the incline is: • 0.17 • 0.34 • 0.22 • 0.28 • 0.81

  3. Q3) A 1.0-kg particle is attached to the end of a string. It swings (يتأرجح)in a vertical circle of radius 1.0 m. When the particle is at the lowest point of the circle, its speed is 10 m/s. The tension (in N) in the string at this point is: • 30 • 50 • 110 • 91 • 100

  4. Q4) The initial velocity of a 2.0-kg particle is (1.0i – 3.0j) m/s. After some time, the velocity becomes (4.0i – 2.0j) m/s. The work done (in J) by the resultant force during this time interval is: • zero • 20 • 10k • 10 • 20k

  5. Q5) A particle moves along the x-axis. It is acted upon by a force Fx (in N) that varies with position x (in m) as shown in the graph. What work (in J) is done by this force as the particle moves from x = 0 m to x = 8 m? • +30 • -30 • -10 • +10 • +70

  6. Q6) A 2.0-kg block slides on a frictionless horizontal surface, as shown in the figure. The speed of the block before it touches the spring (k = 1.0 kN/m) is 5.0 m/s. Its speed (in m/s) at the instant the spring has been compressed 20 cm is: • 2.2 • 5.0 • 25 • 3.0 • 4.5

  7. Q7) A 5.0-kg block slides ((ينزلق along a rough horizontal surface. The coefficient of kinetic friction μk for the block and the surface is 0.40. At what rate (in watts, W) is the frictional force doing work on the block at the instant when its speed is 2.5 m/s? • 49 • -49 • 98 • -98 • -5

  8. A C 60 m 40 m B Q8) A sphere of mass 1.0 kg slides on a rough track ABC. If the sphere starts from rest at point A, and its speed at point C is 10 m/s, then the work done by the frictional force (in J) is: • -188 • 100 • -146 • 100 • -167

  9. Q9) As it moves from point A to point B on a horizontal surface, a particle is acted upon by only two forces: one conservative and the other nonconservative. The kinetic energies of the particle at points A and B are equal if: • the work of the conservative force is equal to that of the nonconservative force • the work of the conservative force is zero • the work of the nonconservative force is zero • the sum of the works of the two forces is zero • none of the above

  10. Q10) The potential energy function for a certain system is given (in J) by the expression U(x,y) = 3x3y3 – 2x2y2 + xy – 1 , where x and y are in m. The magnitude of the corresponding force (in N) at x = 1.0 m and y =1.0 m is: • 6.0 • 14.0 • 19.8 • 11.3 • 8.5

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