Suppose a 70. kg student were to become (be compressed into) a black hole
(a) What would be his/her Schwarzshild radius ("size" of the B.H.)?
(b) How does this compare to the size of a proton?
(
a) 1.0 × 10-25 meters
(b) About 10 orders of magnitude smaller than a proton.
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_________is when material is deposited onto an electrode in an electrochemical cell.
Fill in the blank(s) with the appropriate word(s).
How does Drake define a technological civilization?
A) one that can get into space B) one that can communicate over interstellar distances C) one that has a written language D) one that can construct metal tools E) one that can have the intelligence not to destroy itself
A 30-kg child runs at 3.0 m/s and jumps onto a shopping cart and holds on for dear life. The cart has a mass of 20 kg. Assuming the child rides on the cart after the collision, the speed of the child and shopping cart just after the child jumps on is
A. zero. B. 3.0 m/s. C. 2.5 m/s. D. 1.8 m/s.
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.