Metal lids on glass jars can often be loosened by running them under hot water. Why is this?
a. The hot water is a lubricant.
b. The metal and glass expand due to the heating, and the glass being of smaller radius expands less than the metal.
c. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass thus loosening the connection.
d. This is just folklore.
c
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A proton and electron, each travelling with the same velocity in the +x direction enter a region of uniform magnetic field in the +y direction. If the acceleration of the electron is a in the +z direction, what is the acceleration of the proton?
A. amp/me in the +z direction B. a in the +z direction C. ame/mp in the +z direction D. a in the –z direction E. amp/me in the -z direction F. ame/mp in the -z direction
What is the change in entropy of the lead when 2.0 kg of molten lead solidifies? [Data: Lv = 207. kcal/kg at 1744.°C; Lf = 5.9 kcal/kg at 328.°C]
What will be an ideal response?
The particle which adds mass but no charge to the atomic nucleus is the:
A) positron. B) proton. C) neutron. D) neutrino. E) alpha particle.
Which of these are fundamental physical quantities?
a. space, time, and matter b. kilograms, seconds, and meters c. length, time, and mass d. momentum, energy, and mass