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CG PET Magnetism and Matter — practice questions — page 3

Explore 91 free Magnetism and Matter questions in CG PET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetism and Matter questions and exercises with answers

Showing questions 61–90 of 91.

A lift descends with a downward acceleration equal to g. The apparent weight of a passenger standing inside is:Read the answer and worked solution →A 0.2 kg ball strikes the floor vertically at 10 m s⁻¹ and rebounds at 8 m s⁻¹. The magnitude of the impulse imparted by the floor on the ball is:Read the answer and worked solution →The optimum (design) speed for a car on a frictionless road banked at 45° along a curve of radius 100 m is (g = 10 m s⁻²):Read the answer and worked solution →Sort Kirchhoff's rules by their lawRead the answer and worked solution →Pick the bridge facts, fastRead the answer and worked solution →Complete the bridge storyRead the answer and worked solution →Knock out the bridge mythsRead the answer and worked solution →Flip and match the circuit toolsRead the answer and worked solution →The Lorentz forceRead the answer and worked solution →Work done by a magnetic forceRead the answer and worked solution →Reading the Lorentz forceRead the answer and worked solution →Force on a current wireRead the answer and worked solution →The current carrying conductorRead the answer and worked solution →Charge in a uniform fieldRead the answer and worked solution →What the cyclotron frequency ignoresRead the answer and worked solution →The cyclotron machineRead the answer and worked solution →Formula to what it describesRead the answer and worked solution →The Biot-Savart lawRead the answer and worked solution →Using Biot-SavartRead the answer and worked solution →Field of a circular coilRead the answer and worked solution →Odd one out: magnetismRead the answer and worked solution →Depends on speed or notRead the answer and worked solution →True of the magnetic forceRead the answer and worked solution →Symbol to quantityRead the answer and worked solution →Which is largerRead the answer and worked solution →Field and force directionsRead the answer and worked solution →Currents make fieldsRead the answer and worked solution →Count and computeRead the answer and worked solution →Odd one out: what a current doesRead the answer and worked solution →Zero work, changing directionRead the answer and worked solution →

Worked practice questions

A lift descends with a downward acceleration equal to g. The apparent weight of a passenger standing inside is:

  1. zero
  2. twice mg
  3. equal to mg
  4. half of mg
Show answer and solution

Correct answer: A. zero

Apparent weight N = m(g − a). With downward acceleration a = g, N = 0 — the passenger is in free fall and feels weightless.

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A 0.2 kg ball strikes the floor vertically at 10 m s⁻¹ and rebounds at 8 m s⁻¹. The magnitude of the impulse imparted by the floor on the ball is:

  1. 3.6 N s
  2. 2.0 N s
  3. 1.6 N s
  4. 0.4 N s
Show answer and solution

Correct answer: A. 3.6 N s

Taking upward as positive, impulse = m(v_up − v_down) = 0.2[8 − (−10)] = 0.2×18 = 3.6 N s.

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The optimum (design) speed for a car on a frictionless road banked at 45° along a curve of radius 100 m is (g = 10 m s⁻²):

  1. 31.6 m s⁻¹
  2. 10.0 m s⁻¹
  3. 45.0 m s⁻¹
  4. 22.4 m s⁻¹
Show answer and solution

Correct answer: A. 31.6 m s⁻¹

On a frictionless banked curve the design speed satisfies tanθ = v²/(rg), so v = √(rg tanθ) = √(100×10×tan45°) = √1000 ≈ 31.6 m s⁻¹.

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