The centroid of the parallelogram shown in the figure below is at coordinates (x, y):
(A) 5b/6, h/2
(B) 5b/12, h/3
(C) 5b/8, h/2
(D) 5b/6, h/3
(A) 5b/6, h/2
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Does the magnet repel or attract the falling loop?
A. It attracts the loop. B. It repels the loop. C. It does not exert any force on the loop. D. One needs more information to answer.
A particle (m = 20 mg, q = ?5.0 ?C) moves in a uniform electric field of 60 N/C in the positive x direction. At t = 0, the particle is moving 25 m/s in the positive x direction and is passing through the origin. How far is the particle from the origin at t = 2.0 s?
a. 80 m b. 20 m c. 58 m d. 10 m e. 30 m
An interferometer reduces the resolving power of a telescope
Indicate whether the statement is true or false
The astronaut whose heart rate on Earth is 63 beats/min increases his velocity to v = 0.70c. Now what is his heart rate as measured by an Earth observer?
a. 45 beats/min b. 88 beats/min c. 19 beats/min d. 90 beats/min e. 210 beats/min