OSAT Physics (114)

1. Question 1 · Motion, Forces, Work, and Energy

   Section 1: Motion, Forces, Work, and Energy

   A ball is thrown horizontally at 12 m/s from the top of a cliff 45 m high. Ignoring air resistance, approximately how far from the base of the cliff does it land? (g = 9.8 m/s²)
   • A.24 m
   • B.36 m
   • C.45 m
   • D.54 m
   Show answer and explanation

   Answer: B. 36 m

   Fall time: t = √(2h/g) = √(90/9.8) ≈ 3.0 s. Horizontal velocity stays 12 m/s, so x = 12 × 3.0 ≈ 36 m.

2. Question 2 · Motion, Forces, Work, and Energy

   Section 1: Motion, Forces, Work, and Energy

   A 0.15 kg baseball moving at 40 m/s is hit straight back toward the pitcher at 50 m/s. The bat is in contact with the ball for 0.0050 s. What is the magnitude of the average force on the ball?
   • A.300 N
   • B.1200 N
   • C.1500 N
   • D.2700 N
   Show answer and explanation

   Answer: D. 2700 N

   Taking the new direction as positive, Δp = 0.15(50 − (−40)) = 13.5 kg·m/s. F = Δp/Δt = 13.5/0.0050 = 2700 N. Forgetting the reversal gives 300 N.

3. Question 3 · Electricity, Magnetism, and Waves

   Section 2: Electricity, Magnetism, and Waves

   What type of wave is a sound wave in air?
   • A.Transverse
   • B.Longitudinal
   • C.Electromagnetic
   • D.Surface
   Show answer and explanation

   Answer: B. Longitudinal

   Sound waves in air consist of compressions and rarefactions, which move parallel to the direction of wave motion—this is characteristic of longitudinal waves.

4. Question 4 · Thermal and Modern Physics

   Which phenomenon supports the particle nature of light?
   • A.Interference
   • B.Refraction
   • C.Diffraction
   • D.Photoelectric effect
   Show answer and explanation

   Answer: D. Photoelectric effect

   The photoelectric effect demonstrates that light acts as particles (photons) which knock electrons off a surface.

5. Question 5 · Motion, Forces, Work, and Energy

   A wheel starts from rest and accelerates uniformly to 12 rad/s in 4.0 s. Through what angle does it turn during this time?
   • A.12 rad
   • B.24 rad
   • C.48 rad
   • D.96 rad
   Show answer and explanation

   Answer: B. 24 rad

   θ = ½(ω₀ + ω)t = ½(0 + 12)(4.0) = 24 rad.

6. Question 6 · Motion, Forces, Work, and Energy

   Section 1: Motion, Forces, Work, and Energy

   A car accelerates from rest at 3.0 m/s² for 6.0 s and then travels at constant velocity for another 10 s. What total distance does it cover?
   • A.108 m
   • B.180 m
   • C.234 m
   • D.288 m
   Show answer and explanation

   Answer: C. 234 m

   Phase 1: d = ½(3.0)(6.0)² = 54 m, ending speed 18 m/s. Phase 2: 18 × 10 = 180 m. Total = 234 m.

7. Question 7 · Motion, Forces, Work, and Energy

   Section 1: Motion, Forces, Work, and Energy

   A 0.50 kg ball moving at 8.0 m/s strikes a wall and rebounds at 6.0 m/s in the opposite direction. What is the magnitude of the impulse delivered to the ball?
   • A.1.0 N·s
   • B.3.0 N·s
   • C.7.0 N·s
   • D.14 N·s
   Show answer and explanation

   Answer: C. 7.0 N·s

   Impulse = Δp = 0.50(6.0 − (−8.0)) = 7.0 N·s. Forgetting the direction change gives 1.0 N·s.

8. Question 8 · Electricity, Magnetism, and Waves

   Section 2: Electricity, Magnetism, and Waves

   What determines the frequency of a wave?
   • A.Its wavelength only
   • B.The source that produces it
   • C.Its amplitude
   • D.The speed of the medium
   Show answer and explanation

   Answer: B. The source that produces it

   Frequency is set by the vibrating source and does not change when a wave enters a new medium; speed and wavelength change instead.

9. Question 9 · Thermal and Modern Physics

   What is emitted during the photoelectric effect?
   • A.Photons
   • B.Electrons
   • C.Protons
   • D.Neutrons
   Show answer and explanation

   Answer: B. Electrons

   When light strikes a metal surface in the photoelectric effect, electrons are ejected.

10. Question 10 · Electricity, Magnetism, and Waves

    A mass-spring system has a period of 1.0 s. If the mass is quadrupled with the same spring, what is the new period?
    • A.0.50 s
    • B.1.0 s
    • C.2.0 s
    • D.4.0 s
    Show answer and explanation

    Answer: C. 2.0 s

    T = 2π√(m/k), so T ∝ √m. Four times the mass gives twice the period.

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