Physic Labs

Asian Physics Olympiad · Year 2005

Problems

  1. Problem 1A ball is launched horizontally from height h=20 mh=20\,\mathrm m at u=15 m/su=15\,\mathrm{m/s} above level ground. Neglect air resistance and take g=10 m/s2g=10\,\mathrm{m/s^2}. Horizontal motion is uniform and vertical acceleration is downward. (a) Find the first requested quantity. (b) Find the second quantity. (c) Determine the final result and check its (a) Find the flight time. (b) Find the horizontal range. (c) Find the impact speed and its angle below horizontal.Solutions: 1
  2. Problem 2One mole of monatomic ideal gas is heated at constant pressure from 300 K300\,\mathrm K to 600 K600\,\mathrm K. Use R=8.31 J/(mol K)R=8.31\,\mathrm{J/(mol\,K)}, CV=3R/2C_V=3R/2, CP=5R/2C_P=5R/2, and count work done by the gas as positive. (a) Find the first requested quantity. (b) Find the second quantity. (c) Determine the final result and check its units. (a) (a) Find the work done by the gas. (b) Find its internal-energy change. (c) Find the heat absorbed and verify the first law.Solutions: 1
  3. Problem 3A taut string of length L=0.80 mL=0.80\,\mathrm m is fixed at both ends and carries transverse waves at v=120 m/sv=120\,\mathrm{m/s}. The endpoints are nodes; neglect bending stiffness and consider normal modes. (a) Find the first requested quantity. (b) Find the second quantity. (c) Determine the final result and check its units. (a) Find the funda (a) Find the fundamental wavelength and frequency. (b) Find the frequency of the mode with three half-wavelengths. (c) Count its antinodes.Solutions: 1