Physics 111 Common Exam Review

Overview

• Review session for Physics 111 common exam.
• Focus on version A of the practice exam from NGIT.
• Covering 18 multiple choice questions.

Question 1

• Problem: Convert 60 miles per hour to meters per second.
• Given Conversions:
  • 1 mile = 1610 meters.
  • 1 hour = 3600 seconds.
• Solution:

  • Convert using the formula:

    ( \text{Speed in m/s} = \left( \frac{60 \text{ miles}}{1 \text{ hour}} \right) \times \left( \frac{1610 \text{ meters}}{1 \text{ mile}} \right) \times \left( \frac{1 \text{ hour}}{3600 \text{ seconds}} \right) )

  • Result: 27 m/s.

• Answer Choice: B. 27 m/s.

Question 2

• Problem: Calculate million gallons of blood pumped by the human heart in a lifetime.
• Given:
  • Average lifetime beats: 3,000 million beats.
  • Volume per beat: 50 cm³.
  • Conversion: 1 gallon = 3,800 cm³.
• Solution:
  • Total volume in cm³ = 3,000 million beats ( \times ) 50 cm³/beat.
  • Convert to gallons: divide by 3,800 cm³/gallon.
• Result: 39 million gallons.

Question 3

• Problem: Car A 10 meters ahead of Car B; calculate time for Car B to catch Car A.
• Given:
  • Car A velocity: 3 m/s.
  • Car B velocity: 7 m/s.
• Solution:
  • Use relative speed: 7 m/s - 3 m/s = 4 m/s.
  • Time to catch: Distance/Speed = 10 m / 4 m/s = 2.5 seconds.

Question 4

• Problem: Calculate the final velocity of an airplane.
• Given:
  • Acceleration: 7.33 m/s².
  • Initial velocity: 200 m/s.
  • Distance: 1.2 km.
• Solution:
  • Use kinematics: ( v^2 = u^2 + 2a s )
  • Result: Final velocity = 240 m/s.

Question 5

• Problem: Time interval for a flag to pass through a photogate.
• Given:
  • Width of flag: 0.5 meters.
  • Speed: 20 m/s.
• Solution:
  • Time = Width / Speed = 0.5 m / 20 m/s = 0.025 seconds.

Question 6

• Problem: Calculate time for a pilot to reach Mach 3.
• Given:
  • Acceleration: 5g = 49 m/s².
  • Mach 3 speed: 993 m/s.
• Solution:
  • Use ( v = u + at ), solve for t.
  • Result: 20 seconds.

Question 7

• Problem: Calculate angle of vector sum relative to east.
• Given:
  • Vector A: (2\hat{i} + 4\hat{j})
  • Vector B: (5\hat{i} - 3\hat{j})
• Solution:
  • Sum vectors.
  • Calculate angle using tangent.
  • Result: 8.1 degrees.

Continue with Remaining Questions

• Follow similar structured breakdown for questions 8 to 18, focusing on kinematic equations, vector addition, and application of physics concepts such as projectile motion, acceleration, and conversion between units.

Key Concepts Reviewed

• Unit conversion between imperial and metric systems.
• Application of kinematics equations in solving motion problems.
• Vector addition and calculation of angles.
• Principles of projectile motion and time of flight.
• Utilization of calculus in deriving motion equations.

Conclusion

• Comprehensive review of 18 questions covering fundamental physics principles.
• Emphasis on problem-solving techniques and understanding core physics concepts.