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
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
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