The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 ?T. What is the magnetic field at a distance of 4 cm from this wire?
A) 6 ?T B) 2 ?T C) 4 ?T D) 10 ?T E) 8 ?T
B
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For the Pleiades, a fifty-million-year-old cluster, we find classes ________ and ________ already leaving the main sequence, making the seven bright giants in the "seven sisters."
Fill in the blank(s) with correct word
Why do we call it the "periodic" table of the elements?
a. Because it was discovered in cycles, or periods. b. Because it was rediscovered repeatedly at different times in history. c. Because the properties of elements roughly repeat in each column. d. Because atomic weights increase across a row from left to right. e. Because it is updated periodically.
Based on our current understanding of physics, we can understand the conditions that prevailed in the early universe as far back in time as about ________
A) 10 billion years ago B) 10-45 seconds after the Big Bang C) one ten-billionth of a second after the Big Bang D) 380,000 years after the Big Bang
A wheel of diameter 0.70 m rolls on the floor without slipping. A point at the top of the wheel moves with a speed 2.0 m/s relative to the floor
(a) At what speed is the central axis of the wheel moving relative to the floor? (b) What is the angular speed of the wheel?