Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In that case, ________
A) Galaxy 1 must be twice as big as Galaxy 2
B) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2
C) Galaxy 2 must be twice as old as Galaxy 1
D) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2
B
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At the point of fission, a nucleus of U-238, with 92 protons is divided into two smaller spheres each with 46 protons and a radius of 5.9 × 10^-15 m. What is the repulsive force pushing the two spheres apart when they are just touching one another? (The mass of the U-238 nucleus is 3.98 × 10^-25 kg.)
Potential of Point-Charges: A square is 1.0 m on a side. Point charges of +4.0 ?C are placed in two diagonally opposite corners. In the other two corners are placed charges of +3.0 ?C and -3.0 ?C. What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1.0 × 104 V B. 1.0 × 105 V C. 1.0 × 106 V D. 0 V E. infinite
Exhibit 16-1
A graph of position versus time for an object oscillating at the free end of a horizontal spring is shown below.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 16-1. A point or points at which the object has positive velocity and zero acceleration is(are)
A. B B. C C. D D. B and D E. A and E