LCDs operate on the principle of refraction through glass
a. True
b. False
Indicate whether the statement is true or false
False
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Tarzan swings back and forth on a long vine. His friend Jane notices in amazement that he makes 30 complete swings in 2.4 minutes
(a) What is the frequency (in hertz) of Tarzan's swing? (b) How long is the vine he is using?
Standing Waves on a String: If the frequency of a violin string is to be increased by 20%, what change in tension must be applied?
A. 44% B. 20% C. 4.5% D. 10%
In a diagram of electric field lines, q1 has 9 lines going into it and q2 has 27 lines going out of it. If one of the charges is -40 mC, which of the following could be the other one?
A. -120 mC B. 18.0 mC C. -18.0 mC D. 120 mC E. none of the these choices are correct
The resultant force R (in newtons) for the force system shown in the figure is:
(A) 29.5i 1 36.4j – 81.4k
(B) 229.5i – 36.4j 1 78.3k
(C) 236.4i 1 29.5j 1 81.4k
(D) 239.3i 1 36.4j 1 122.2k
