An external interaction exerts a force 
on a certain system as the place where the force is applied moves a displacement 
. Which of the following is the correct component expression for the work done by the interaction on the system?
A. W = [Fx dx, Fy dy, Fz dz]
B. W = ?[Fx dx, Fy dy, Fz dz]?
C. W = Fx dx + Fy dy + Fz dz
D. Some other expression (specify)
C. W = Fx dx + Fy dy + Fz dz
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Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance. Which one of the following statements about these objects is correct?
A) It takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier. B) It takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier. C) It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter. D) It takes the heavier object 10 times longer to reach the bottom of the ramp than the lighter. E) The two objects reach the bottom of the ramp at exactly the same time.
State which element is oxidized and which is reduced in the reaction Fe + Cl2? FeCl2
Momentum: What is the momentum of a proton when it is moving with a speed of 0.60c? (mproton = 1.67 × 10-27 kg)
A. 1.2 × 10-19 kg? m/s B. 1.5 × 10-19 kg ? m/s C. 3.0 × 10-19 kg ? m/s D. 3.8 × 10-19 kg ? m/s
Suppose that we look at a photograph of many galaxies. Assuming that all galaxies formed at about the same time, which galaxy in the picture is the youngest?
A) the one that is reddest in color B) the one that is bluest in color C) the one that is farthest away D) the one that is closest to us E) the one that appears smallest in size