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Estimation&order of magnitude exercises. IB Physics 1.
Name:______________________
1. How many heartbeats are there in the lifetime of a person (75 years)?
2. Give an order-of-magnitude estimate for the mass of:
a) a melon,
b) your schoolbag,
c) a soccer ball.
3. A white dwarf star has a mass that of the sun and a radius about that of the earth. Give and
order-of-magnitude estimate of the density of the white dwarf.
4. Give the order of magnitude of the following quantities:
a) 20 000
b) 2.6 x 104
c) 3.9 x 107
d) 7.4 x 1015
e) 2.8 x 10-24
f) 4.2 x 10-30
5. Give the order of magnitude of the following measurements
a) The mean radius of the earth, 6 370 000 m.
b) The half-life of a radioactive isotope 0.0015 s.
c) The mass of Jupiter, 1 870 000 000 000 000 000 000 000 000 kg.
d) The average distance of the moon from the earth is 380 000 000 m.
e) The wavelength of red light 0.000 000 7 m.
6. What is the order of magnitude of:
a) the time in seconds in a year.
b) the time for the moon to revolve around the earth in seconds.
7. Without using a calculator estimate the value of the following expressions and then compare
the exact value using a calculator
a) 16 x 5280 x 5280 x 5280 x 12 x 12 x 12
b) 3728 x (470165 x 10-14) ÷ 278146 x (0.000713 x 10-5)
c) 47816 x (4293 x 10-4) ÷ 403000
8. A rough estimate of the volume of your body in cm3 would be closest to:
a) 2 x 103
b) 2 x 105
c) 5 x 103
d) 5 x 105