A girl lifts a ball by means of a string attached to the ball. The string exerts a 20 newton force on the ball. The ball weighs 8 newtons. The net force on the ball is
A) zero. B) 28 newtons. C) 12 newtons. D) 20 newtons. E) 8 newtons.
C
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For the stress-strain diagram of PMMA shown in Figure 6.16, determine the following:
(a) the tangent elastic modulus at 0 strain, (b) the yield stress, (c) the resilience, (d) the ultimate tensile strength, and (e) the toughness.
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are positive, its angular velocity is positive, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating clockwise and then counterclockwise.
At what temperature is the Celsius temperature and the Fahrenheit temperature are same?
A. 30
B. 35
C. -40
D. 45
E. -30