Periodic motion
1. An object is tied to a spring and moves in opposite directions in a certain frequency with nonzero amplitude, due to the spring's movement. Consider the two following states:
I) At some point, the mass has a zero velocity and nonzero acceleration.
II) At some point, the mass has a nonzero velocity and zero acceleration.
Which of the following is true?
A) Only I
B) Both
C) Only II
D) None of the above
Chemical equilibrium
2. When the following reaction arrives at equilibrium [POCL] = [Cl2] = 0.15 M. What was the initial concentration of POCl3?
A) 0.225M
B) 0.200M
C) 0.633M
D) 2.00M
Newtonian mechanics
3. A ten meter wooden pole that weights 2Kg has metal caps on both of its sides. The left cap weights 2Kg and the right cap weights 1Kg. what is the distance from the right end of the pole at which a rope can be connected to keep the pole suspended in the air, parallel to the ground?
A) 3m
B) 5m
C) 6m
D) 7m
Magnetism
4.The following magnet is cut into two equal peaces, which are then turned 180 degrees around their axis.
Which of the following statements regarding these newly formed magnets are true?
I) They now exert an equal force on each other in the same direction.
II) The forces they exert on each other can cause them to spin in opposite directions.
III) they will exert a force that points outside the plain of the screen on a moving electron located between them.
A) III only
B) II only
C) I and III
D) I only
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