Who provided evidence for the existence of a nucleus of an atom?
Answer: Ernest rutherford
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The Sun creates its energy by the process of
a. nuclear fission. b. nuclear fusion. c. convection. d. conduction. e. radiation.
Plasmas are a central part of power generation in
A) MHD generators. B) turbo generators. C) both of these D) neither of these
Two point charges are 12 cm apart. They are moved to a new separation of 3 cm. By what factor does the resulting mutual force between them change?
a. 1/4 b. 4 c. 1/16 d. 16 e. 4.5
Suppose the ends of a 27-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The rail has a cross-sectional area of 35 cm2 . What force does the beam exert when it is heated to 39°C? (?steel = 1.1 × 10^?5/C°, Ysteel = 2.0 × 10^11 N/m2)
a. 3.0E+5 N b. 1.2E+3 N c. 1.7E+3 N d. 2.3E+2 N e. 7.5E+4 N