Coal exploitation gives a better return on investment than other fossil fuels
What will be an ideal response?
No, the infrastructure for coal involves much more earthmoving than, for example,
oil production.
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Coulomb's Law: The force of attraction that a -40.0 ?C point charge exerts on a +108 ?C point charge has magnitude 4.00 N. How far apart are these two charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 2.10 m B. 3.67 m C. 3.12 m D. 2.49 m E. 1.13 m
Gravitational Force: A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity?
A. when it gets above the atmosphere B. when it is half-way there C. when it is closer to the Moon than it is to Earth D. It is never beyond the pull of Earth's gravity.
Heat flow occurs between two bodies in thermal contact when they differ in what property?
a. mass b. specific heat c. density d. temperature
Why does the Moon not have a magnetic field?
A. The Moon's magnetic field was destroyed by bombardment by planetesimals. B. The Moon lacks an atmosphere. C. It rotates very slowly and has a cold interior. D. Any field the Moon could generate is overwhelmed by Earth's field. E. Only planets can have magnetic fields.