A “free” electron and a “free” proton are placed in an identical electric field. Is the following statement true or false?
The electric force on the proton is greater in magnitude than the electric force on the electron, but in the opposite direction.
1.False
2.True
1
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In what geometric way can we determine the absolute distances to the planets?
What will be an ideal response?
A brass rod, 75.0 cm long and having a cross-sectional area of 2.50 cm2, conducts heat from a large furnace at 375°C into a very large cold water bath at 10.0°C without losing any heat at the lateral surface of the rod
Steady state has been established, and the thermal conductivity of brass is 109 W/m?K. The rate at which the entropy of the system (furnace plus water) is changing is closest to A) 6.74 × 10-2 W/K. B) 2.64 × 10-2 W/K. C) 2.05 × 10-2 W/K. D) 3.54 × 10-2 W/K. E) 4.69 × 10-2 W/K.
Positively charged particles in an atom are called ________.
A. electrons B. protons C. neutrons D. positrons E. neutrinos
A ball is tossed upward. Neglecting air drag, the acceleration along its path is
A) 0 g. B) g downward. C) g upward. D) g upward, then g downward. E) none of the above