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  1. Practice problem

    Interference inside a diffraction envelope →

    Advanced · Connect concepts. How many interference-order positions lie strictly between the first single-slit diffraction minima, including the central order?

  2. Practice problem

    Is there enough grip to roll? →

    Advanced · Connect concepts. What is the minimum coefficient of static friction for pure rolling?

  3. Practice problem

    Join two motion stages →

    Intermediate · Connect concepts. Find the total distance.

  4. Practice problem

    Keep room above the water →

    Intermediate · Apply a principle. What maximum cargo mass leaves at least 0.040 m of freeboard?

  5. Practice problem / FREE SAMPLE

    Keep the last justified decimal →

    Beginner · Apply a principle. Choose the reporting rule for addition before rounding.

  6. Practice problem

    Keep the sign while removing the magnitude →

    Beginner · Apply a principle. What is the x component of the unit vector in its direction?

  7. Practice problem

    Keep the term that carries the energy →

    Intermediate · Connect concepts. Find the gain in gravitational potential energy.

  8. Practice problem

    Leave enough current for regulation →

    Intermediate · Find a missing quantity. Find the maximum load current that preserves regulation.

  9. Practice problem

    Leave the coil only its rated current →

    Intermediate · Connect concepts. Which expression gives the exact shunt resistance under this ideal model?

  10. Practice problem / FREE SAMPLE

    Leave voltage for the current limiter →

    Beginner · Apply a principle. An LED is not a resistor whose value is V_f/I at all currents; the declared forward-drop model has a limited operating range.

  11. Practice problem

    Less beam power can improve fringe visibility →

    Advanced · Compare cases. By what factor does fringe visibility increase?

  12. Practice problem

    Light exerts a pressure →

    Intermediate · Apply a principle. Find its radiation pressure.

  13. Practice problem

    Locate a real mirror image →

    Intermediate · Find a missing quantity. Find the real image distance in front of the mirror.

  14. Practice problem / FREE SAMPLE

    Magnify the angle of a distant object →

    Intermediate · Apply a principle. Connect objective and eyepiece focal lengths in a relaxed-eye telescope.

  15. Practice problem

    Make the exponent dimensionless →

    Intermediate · Apply a principle. Find the remaining fraction after 90 seconds.

  16. Practice problem

    Masking changes sharpness, not centre separation →

    Intermediate · Compare cases. What is the ratio of the angular separation of the line centres after masking to before masking?

  17. Practice problem

    Mass missing from a bound nucleus →

    Intermediate · Apply a principle. Find its binding energy in MeV.

  18. Practice problem

    Maximum flux is not maximum induced emf →

    Intermediate · Connect concepts. What is the signed induced emf at θ = π/6 for the positive circulation linked to that normal?

  19. Practice problem

    Measure coupling by reversing one coil →

    Advanced · Find a missing quantity. What is the magnitude of their coupling coefficient?

  20. Practice problem

    Measure index without knowing the fringe order →

    Intermediate · Read graphs & measurements. What film refractive index follows from the spacing?