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
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.
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?
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