The number of cycles of a wave passing a point per unit time is the wave's period
Indicate whether the statement is true or false
F
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Force on a Wire: A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.65 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section BC of this wire?
A. 0 N B. 0.090 N perpendicular out of the page C. 0.090 N perpendicular into the page D. 0.060 N perpendicular out of the page E. None of these
Which system has the greater entropy, a puddle of water sitting on a table next to a chaotic scattering of salt crystals or the same amount of salt dissolved in an evenly distributed way in the puddle? Be prepared to describe your reasoning.
A. The puddle and the scattered crystals. B. The puddle with the dissolved salt. C. Both have the same entropy. D. One needs detailed models of water and salt to say.
Which force is the strongest within an atomic nucleus?
A) strong B) weak C) electromagnetic D) gravity E) They are all equal.
The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 × 105 Bq, to decay to an activity of 100 Bq?
A) 45 days B) 36 days C) 54 days D) 31 days