Equilibrium: In the figure, a uniform ladder of weight 200 N and length 10 m leans against a perfectly smooth wall. A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of static friction between the ladder and the floor is 0.50. What is the maximum value of x for which the ladder will not slip?
A. 3.9 m
B. 5.0 m
C. 6.0 m
D. 6.3 m
E. 8.4 m
Answer: D
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A circular loop carrying a current of 1.25 A is oriented in a magnetic field of 0.22 T. The loop has an area of 0.10 m2 and is mounted on an axis, perpendicular to the magnetic field, which allows the loop to rotate. If the plane of the loop is oriented parallel to the field, what torque is created by the interaction of the loop current and the field?
a. 0.018 N?m b. 2.8 N?m c. 0.028 N?m d. 0.014 N?m e. 57 N?m
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a. fracturing. b. cleaving. c. scratching. d. crushing.
The exchange particles for the weak force are very massive (about 100 times as massive as a proton). This would lead one to expect that the weak force would
A) act over a very long range. B) be transmitted at the speed of light. C) act over a very short range. D) only act on very massive particles.