Assume a gram of a substance marketed as "Pure Energy" is annihilated by a gram of a second substance "Anti-Pure Energy." How long would the energy released power a city which uses 109 watts of power?
a. 40 hrs
b. 25 hrs
c. 50 hrs
d. 65 hrs
e. 50000 hrs
c
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Velocity Addition: In an "atom smasher," two particles collide head on at relativistic speeds. If the velocity of the first particle is 0.741c to the left, and the velocity of the second particle is 0.543c to the right (both as measured in the lab rest frame), how fast are the particles moving with respect to each other?
A. 0.916c B. 1.284c C. 0.934c D. 0.834c
A 10 solar mass star is about ten times more luminous than a 1 solar mass star
Indicate whether the statement is true or false
The force of the floor pushing up on you to counter your weight is an example of a ________ force.
Fill in the blank(s) with the appropriate word(s).
An ideal transformer has 50 turns in its primary and 250 turns in its secondary. When 12-V ac is connected to the primary, the voltage available to the secondary is
A) 5 V. B) 10 V. C) 30 V. D) 60 V.