The two men compete in a tug of war. Both pull equally and the scale reads 800 newtons. Each man must pull with a force of
1) 400 N.
2) 800 N.
3) 0 N.
Consider action and reaction forces in this case: If action is the man on the left pulling on the rope, then the reaction force is
4) the rope pulling on the man on the left.
5) the rope pulling on the man on the right.
6) the man on the right pulling on the rope.
Answer: 2, 4
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What is the capacitance of a capacitor with a reactance of 20.0 
at a frequency of 60.0 Hz?
A. 50.0 mF
B. 50.0 
F
C. 133 mF
D. 133
F
E. 833
F
A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum shear stress in the cylindrical part of the tank is approximately:
(A) 17 MPa
(B) 26 MPa
(C) 34 MPa
(D) 38 MPa
Of all the active galactic nuclei, the ________ is the most energetic
A) quasar B) giant elliptical C) radio lobe galaxy D) blazar E) Seyfert
Mouthwash is a good example of
a. a compound. b. a heterogeneous mixture. c. a homogeneous mixture. d. an element.