Answer the following statement(s) true (T) or false (F)
1. If two moving objects collide, we can always orient our reference frame so that the collision takes place entirely in the xy plane
2. An object of mass m1 moving in the +x direction collides with another object at rest with mass m2. After the collision, the object with mass m2 is observed moving in the +y direction. Such a collision cannot be elastic, no matter what m1 and m2 might be.
1. FALSE
2. TRUE
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Atoms that have the same number of protons but a different number of neutrons are called
a. ions. b. molecules c. atomic pairs. d. nuclear pairs. e. isotopes.
Absolute zero is the temperature of
A. frozen water B. the Universe C. liquid helium D. nothing
The allowed values for the magnetic quantum number, m , are from m = -? to +?
Indicate whether the statement is true or false
Equal but opposite charges Q are placed on the square plates of an air-filled parallel-plate capacitor. The plates are then pulled apart to twice their original separation, which is small compared to the dimensions of the plates
Which of the following statements about this capacitor are true? (There may be more than one correct choice.) A) The capacitance has doubled. B) The electric field between the plates has increased. C) The energy stored in the capacitor has doubled. D) The energy density in the capacitor has increased. E) The potential difference across the plates has doubled.