What is the temperature increase of 3.00 kg of water when heated by a 900-W immersion heater for 9.00 min? (cw = 4 186 J/kg/°C)
a. 77.4°C
b. 48.4°C
c. 38.7°C
d. 19.4°C
e. 0.645°C
c
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The atomic nucleus contains
A) yogurt. B) protons only. C) neutrons and electrons. D) protons and neutrons. E) protons and electrons.
Consider a brick that is totally immersed in water. The long edge of the brick is vertical. The pressure on the brick is
A) the same on all surfaces of the brick. B) greatest on the face with largest area. C) greatest on the top of the brick. D) greatest on the sides of the brick. E) greatest on the bottom of the brick.
The percentage of a radionuclide that would remain after 4 half-lives is ______________
Fill in the blank(s) with correct word
Protons and electrons
1) repel each other. 2) attract each other. 3) do not interact with each other. If the distance between a proton and an electron is doubled, the electrical force is 4) 1/4 as much. 5) 1/2 as much. 6) the same. 7) twice as much. 8) four times as much.