A 1.75-kg picture frame is hung on the wall by means of a string as in the figure (show picture frame with distance between the points of connection on the frame labeled with 37.0cm and vertical displacement of the string as 4.00cm). What is the tension T in the string?
A. 8.6 N
B. 40.6 N
C. 159 N
D. 17.2 N
E. 79.4 N
B. 40.6 N
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A train starts from rest and accelerates uniformly until it has traveled 2.1 km and acquired a forward velocity of The train then moves at a constant velocity of for 400 s. The train then slows down uniformly at until it is brought to a halt
The distance traveled by the train while slowing down is closest to A) 4.4 km. B) 4.2 km. C) 4.0 km. D) 3.8 km. E) 3.6 km.
When we say that an electromagnetic field is "quantized," we mean that
A) whenever it interacts with atoms, it must deposit an entire "quantum" of energy at each interaction. B) its energy is "digitized" to have either 0, 1, 2, 3, etc. units of a basic energy increment. C) it impacts a viewing screen as tiny bundles of radiation. D) All of the above. E) None of the above.
A 20-?F capacitor charged to 2.0 kV and a 40-?F capacitor charged to 3.0 kV are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 20-?F capacitor after the two are so connected?
a. 53 mC b. 27 mC c. 40 mC d. 80 mC e. 39 mC
State Gauss's law
What will be an ideal response?