IB SL Physics Poorly Answered Questions 4

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A fourth tutorial sheet of questions that are not well answered in SL Physics is given below.

  1. A resistor X has the shape of a cylinder of cross sectional area A and length L. The resistance of X is R. What is the resistance of a resistor Y made of the same material as X having the same volume as X but one-half the length of X? The resistors are at the same temperature.
  2. An ideal gas particle of mass m moving at a speed v strikes the wall of the container at an angle of 𝜽 to the surface. What is the magnitude of the change in momentum of the particle due to the collision?
  3. A cell of emf E and internal resistance r is connected to a variable resistance R. The potential difference across the cell is V and the current in the circuit is I. The gradient of the graph of V versus I is (a) R, (b) r, (c) -r, (d) -R
  4. The emf of a cell is the work done in moving a unit positive charge through the cell. True or false?
  5. A trolley of mass M is pulled along a smooth horizontal surface with an acceleration a by a string tied to a falling mass. The string passes over a smooth pulley at the end of the table. Express the mass of the falling object in terms of a, g and M.
  6. The following nuclear reaction occurs, P + Q -> R + S. This reaction can be called nuclear fission if (a) energy is released, (b) P is a neutron, (c) R and S have a lower binding energy per nucleon than P + Q , (d) R and S have a higher binding energy per nucleon than P + Q
  7. A block of mass M moves at a speed U to the east. After a time interval t the speed of the block is V to the west. The magnitude of the impulse given to the block during this time interval is (a) M(V - U)t (b) M(V - U) (c) M(V + U)t (d) M(V + U)
  8. Which of the following equations is now used to define the kilogram? (a) F = mg, (b) F = ma, (c) hf = mc2 (d) E = mc2.

HSC Physics Moving Reference Frames

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A tutorial sheet of questions on a moving object seen in a moving reference frame is given below.

  1. A bus moves to the west at a constant velocity. A ball is released from rest relative to the bus. Describe the path of the ball (a) relative to the bus (b) relative to the ground.
  2. A bus is moving to the east with a constant acceleration to the east. A ball is released from rest relative to the bus. Describe the path of the ball (a) relative to the bus (b) relative to the ground.
  3. A bus is moving to the east with a constant acceleration to the west. A ball is released from rest relative to the bus. Describe the path of the ball (a) relative to the bus (b) relative to the ground.
  4. An elevator is moving upwards at a constant velocity. A ball is thrown horizontally inside the elevator. Describe the path of the ball (a) relative to the elevator (b) relative to the ground.
  5. An elevator is moving upwards with a constant acceleration upwards. A ball is thrown horizontally inside the elevator. Describe the path of the ball (a) relative to the elevator (b) relative to the ground.
  6. A boy and a girl sit at opposite ends of the diameter on a rotating table. At a certain instant the boy is moving to the west and the girl to the east. The girl throws a ball that is caught by the boy. Describe the initial velocity components of the ball (a) relative to the table, (b) relative to the ground.
  7. A simple pendulum has a period of oscillation T. The pendulum is supported over the centre of a rotating reference frame of period of revolution P. Find the period of oscillation of the pendulum in the rotating reference frame when (a) P = T, (b) P > T, (c) P < T