If H equals 50 km/sec/Mpc, then a galaxy with a radial velocity of 50,000 km/sec will have a distance of about 1 Mpc
Indicate whether the statement is true or false
F
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Coulomb's Law: One point charge +Q is placed at the center of a square, and a second point charge -Q is placed at the upper-left corner of the square. It is observed that an electrostatic force of magnitude 2.0 N acts on the positive charge at the center. Now a third charge -Q is placed at the lower-left corner of the square, as shown in the figure. What is the magnitude of the net force that acts on the center charge now?
A. 0.0 N B. 2.8 N C. 4.0 N D. 5.3 N
In what part of our atmosphere do we live?
A) Troposphere B) Stratosphere C) Mesosphere D) Ionosphere E) Exosphere
Two students are working on the same constant-acceleration problem involving a car undergoing constant acceleration, having started from rest and after a certain time having traveled a distance of 108 m. The students are to find the average velocity. Both students are required to show their work and round any intermediate answers as well as the final answer properly to 3 significant figures. Each
rounded answer is to be used in the next step of calculation as they proceed. For the final answer, Student A uses the formula vavg = (xf – xi)/(tf – ti) getting the result 7.26 m/s, and Student B uses the formula vavg = (v0 + v)/2 getting the result 7.29 m/s. Assuming neither student makes a mistake, which student has the better answer? a. Student A b. Student B c. Under significant figure rounding, both answers are equally as good. d. The described result cannot happen; this is physics after all.
A taxicab moves five blocks due north, five blocks due east, and another three blocks due north. Assume all blocks are of equal size. How far is the taxi from its starting point?
a. 13 blocks c. 9.2 blocks b. 9.4 blocks d. 8.6 blocks