Astronaut Brian leaves Earth in a spaceship at a speed of 0.280c relative to an observer on Earth. Brian is holding a pencil at an angle of 30.0 with the direction of travel, as seen by Brian.
What angle does the pencil make with the direction of travel, as seen in the frame of reference of the observer? A) 29.0
B) 30.0
C) 31.0
D) 32.0
E) 33.0
Question 2
An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1200 J of heat from the hot reservoir and produces 450 J of work. How much entropy is created in the process?
A) 0.32 J/K
B) 0.68 J/K
C) 0.44 J/K
D) 0.73 J/K
E) 0 J/K
The pH scale and the relative acidities of common substances
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