What would happen to the planets in a solar system where the central star did not have a strong wind?
A) Nothing, the star does not affect the process of planet formation.
B) One planet would grow to dominate all the others and gravitationally eject them out of the system.
C) All planets would continue to grow to large sizes but their orbits would be unchanged.
D) The gas in the solar nebula would create a drag on the planets and their orbits would migrate inwards.
E) The gas in the solar nebula would create a drag on the planets and their orbits would migrate outwards.
D
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A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two second time. The distance below the rooftop is __________
Fill in the blank(s) with correct word
Photography Optics: A 35-mm camera equipped with a 40-mm focal length lens is used to photograph a tree 17 m tall. If a 32-mm high image of the tree on the CCD sensor is required, how far should the camera lens be from the tree?
A. 21 m B. 22 m C. 23 m D. 24 m E. 26 m
If a 2.0-MeV neutron released in a fission reaction loses half its kinetic energy in each moderator collision, how many collisions are needed to reduce its kinetic energy to 1/25 eV?
A) 6 B) 18 C) 26 D) 30 E) 4
The term "solid-state electronics" refers to
A. the replacement of positive charges with electrons in devices. B. the increased use of metals in electronic devices. C. our ability to now use solids to make electronic devices. D. the use of transistors rather than vacuum tubes.