Introducing Physics

  1. What are the base units in the following cases; 2mm, 25kg, 300 ps, 500 Mb?
  2. Write the following in terms of their base units; 45mm, 22Ms, 0.5nm, 32kW.
  3. Write the following in a derived unit closest to its value; 2,200,000 s, 0.0054m, 1,100g, 0.000005g.
  4. Write the following in scientific notation; 1,500,000m, 0.0043s, 1,980,000,000,000$, 0.000000000067N.
  5. Write the following in normal notation; 1.45 \times 10^{3}, 3.14 \times 10^7, 0.6 \times 10^{5}, 7.3 \times 10^{-3}, 2.5 \times 10^{-8} .
  6. Estimate the time it would take to walk across the United States.
  7. Estimate the number of hairs on your head.
  8. Estimate the mass of water in the ocean.