FUVEST (University of São Paulo Entrance Exam) · Mathematics and Physics

Physics: Mechanics, Electricity and Waves

30 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 30 questions

  1. A force of 1000 N acts perpendicularly on an area of 2 m². What is the pressure?
  2. A 50 ohm resistor carries a current of 3 A. What is the voltage across it?
  3. A 25 ohm resistor carries a current of 3 A. What is the voltage across it?
  4. A metal block of volume 10 cm³ has a mass of 20 g. What is its density?
  5. A machine does 600 J of work in 10 s. What is its average power?
  6. A force of 200 N acts perpendicularly on an area of 8 m². What is the pressure?
  7. A stone is dropped from rest (g = 10 m/s², no air resistance). How far has it fallen after 2 s?
  8. A 5 kg cart moving at 4 m/s sticks to a 5 kg cart at rest. What is their common speed afterwards?
  9. A motor receives 800 W and has an efficiency of 60%. What useful power does it deliver?
  10. A car starts from rest with constant acceleration 4 m/s². What is its speed after 200 m?
  11. How many kilojoules are needed to heat 1 kg of water by 10 °C? (c = 4 kJ/(kg·°C))
  12. How many kilojoules are needed to heat 2 kg of water by 20 °C? (c = 4 kJ/(kg·°C))
  13. Two resistors of 12 and 6 ohms are connected in parallel. What is the equivalent resistance?
  14. Two resistors of 20 and 5 ohms are connected in parallel. What is the equivalent resistance?
  15. What is the kinetic energy of a 4 kg object moving at 2 m/s?
  16. A 20 ohm resistor carries a current of 5 A. What is the voltage across it?
  17. A machine does 600 J of work in 3 s. What is its average power?
  18. A force of 1000 N acts perpendicularly on an area of 5 m². What is the pressure?
  19. A force of 200 N acts perpendicularly on an area of 4 m². What is the pressure?
  20. What is the kinetic energy of a 2 kg object moving at 3 m/s?
  21. A metal block of volume 50 cm³ has a mass of 250 g. What is its density?
  22. A machine does 1200 J of work in 5 s. What is its average power?
  23. A force of 1000 N acts perpendicularly on an area of 8 m². What is the pressure?
  24. A net force of 12 N acts on a 3 kg block. What is its acceleration?
  25. How much gravitational potential energy does a 50 kg object gain when lifted 2 m (g = 10 m/s²)?
  26. A wave has wavelength 2 m and frequency 20 Hz. What is its speed?
  27. A net force of 40 N acts on a 8 kg block. What is its acceleration?
  28. Two resistors of 6 and 3 ohms are connected in parallel. What is the equivalent resistance?
  29. A 2 kg cart moving at 6 m/s sticks to a 1 kg cart at rest. What is their common speed afterwards?
  30. A motor receives 500 W and has an efficiency of 75%. What useful power does it deliver?

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