SIMAK UI · Natural Sciences (Kemampuan IPA)

Physics: Mechanics, Thermodynamics and Electromagnetism

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

Practise Physics: Mechanics, Thermodynamics and Electromagnetism now

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

All 25 questions

  1. A 2 kg projectile is launched from ground level at an angle of 30° with an initial speed of 40 m/s. Neglecting air resistance and taking , what is its kinetic energy at the peak o…
  2. An ideal heat engine operates on a Carnot cycle between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. If the engine absorbs 2.500 J of heat per cycle from the hot res…
  3. Two point charges of and are separated by a distance of 30 cm in vacuum. At what point along the line connecting the charges is the net electric field zero?
  4. A simple pendulum of length has an oscillation period on Earth (). If transported to a planet where gravitational acceleration is , what is its new period?
  5. A long straight wire carries a steady direct current of 5 A. What is the magnetic field magnitude at a perpendicular distance of 10 cm from the wire in vacuum? (…
  6. A block of mass 4 kg rests on a rough horizontal surface with coefficient of static friction . A horizontal force of 15 N is applied to the block. Taking , what is…
  7. A sound source emits acoustic waves uniformly in all directions at a constant power. If an observer triples their distance from the source, by how many decibels does the sound intensity level decrease…
  8. An electron enters a uniform magnetic field of 0,2 T perpendicularly with a velocity of . Given and…
  9. A container holds 2 moles of an ideal monatomic gas at an initial temperature of 300 K. How much heat must be added at constant volume to raise its temperature to 400 K? (Take…
  10. Light in air strikes a glass plate with refractive index at Brewster's angle . What is the angle of refraction inside the glass?
  11. A 100 g bullet traveling at 400 m/s embeds itself into a stationary 3,9 kg ballistic pendulum. With what initial velocity does the combined system begin to swing?
  12. An AC circuit contains a resistor, a 0,2 H inductor, and an AC source with frequency 50 Hz. What is the inductive reactance of the inductor? (Take )
  13. A solid sphere and a hollow cylinder of equal mass and equal radius roll without slipping down an inclined plane from the same height. Which object reaches the bottom first and why?
  14. An object is placed 15 cm in front of a concave spherical mirror with a focal length of 10 cm. Describe the nature and location of the resulting image.
  15. In a photoelectric effect experiment, monochromatic light of wavelength 400 nm falls on a metal surface with work function . What is the maximum kinetic energy of ejected photo…
  16. A copper rod of length 1,0 m expands by 0,85 mm when heated from 20°C to 70°C. What is the linear expansion coefficient of copper?
  17. Two parallel plates separated by 2 mm have a potential difference of 100 V across them. What is the electric field strength in the uniform region between the plates?
  18. What is the de Broglie wavelength of a thermal neutron of mass moving at a speed of ? (…
  19. An ideal gas undergoes an isothermal expansion from volume to volume at temperature . Which of the following thermodynamic statements is TRUE?
  20. A car horn emits sound at 440 Hz while traveling toward a stationary observer at 20 m/s. If the speed of sound in air is 340 m/s, what frequency does the observer perceive?
  21. A 50 kg satellite orbits Earth in a circular orbit at radius . If it is transferred to a higher circular orbit of radius , how do its kinetic energy and gravitational potential energy change?
  22. A transformer has 500 turns on its primary coil and 50 turns on its secondary coil. If connected to a 220 V AC source, what is the output voltage on the secondary coil?
  23. In Young's double-slit experiment, slits are separated by 0,2 mm and the screen is placed 1,0 m away. If the 3rd dark fringe appears 7,5 mm from the central maximum, what is the wavelength of the ligh…
  24. A radioactive sample has a half-life of 8 days. After how many days will the remaining activity be reduced to 6,25% of its initial activity?
  25. What is the escape velocity from a spherical asteroid with mass and radius ? ()

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