An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the x-y plane
Calculate the magnitude of the magnetic force on the electron. A) 2.8 × 10-10 N
B) 3.2 × 10-10 N
C) 2.8 × 10-12 N
D) 3.2 × 10-12 N
E) 0 N
C
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Mass on a Spring: An object attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could
A. double the amplitude of vibration. B. double the force constant (spring constant) of the spring. C. double both the amplitude and force constant (spring constant). D. double the mass. E. double both the mass and amplitude of vibration.
Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline. The acceleration down the incline is 1.00 
and the velocity is up the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. There is no friction. The tension in the string is
A. 2070 N. B. 1470 N. C. 980 N. D. 771 N. E. 1,710 N.
Answer the following statement(s) true (T) or false (F)
1. In a maximally efficient heat engine, the amount of entropy that the hot reservoir loses as heat flows out of it is exactly balanced by the entropy that the cold reservoir gains as the waste heat flows into it.
An ideal gas is held in a container of volume V at pressure P. The rms speed of a gas molecule under these conditions is v. If now the volume and pressure are changed to 2V and 2P, the rms speed of a molecule will be
A) 1/2 v B) v C) 2v D) 4v E) v/4