In a neutral atom, the number of electrons is equal to the number of protons
What will be an ideal response?
This is correct. The charges on the proton and the electron are the same size to a
really impressive number of decimal places. One is positive, one is negative; adding up the
positive and negative charges yields zero.
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A rectangular steel plate with dimensions of 60 cm × 25 cm is heated from 20°C to 150°C. What is its change in area? (Coefficient of linear expansion for steel is 11 × 10^-6/°C.)
a. 0.82 cm2 c. 4.3 cm2 b. 1.1 cm2 d. 6.6 cm2
A water-filled paper cup held in a flame will not catch fire. This is because
A) the inside of the paper is wet. B) water is an excellent conductor of heat. C) paper is a poor conductor of heat. D) the paper cup cannot become appreciably hotter than the water it contains.
How "slow" must a 200. gram ball move to have a deBroglie wavelength of 1.0 mm?
What will be an ideal response?
If the plane x = 4 m is an equipotential surface, in which of the following directions can the electric field be in the region immediately adjacent to this plane?
a. the positive y direction b. both the positive and negative z directions c. the positive x direction d. more than one of these choices