Conversion of Units: At a certain time, the average size of a transistor in a microprocessor was 250 nanometers. A human hair has a diameter of 70 microns (micrometers). How many transistors fit across a human hair?
A. 280
B. 28
C. 2800
D. 2.8
E. 0.28
Answer: A
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If the temperature of a room is 60
then what is the temperature of the room in Celsius?
A. 26.2
B. 24.0
C. 21.4
D. 19.7
E. 15.6
A ball rolls across a floor with an acceleration of 0.100 m/s2 in a direction opposite to its velocity. The ball has a velocity of 4.00 m/s after rolling a distance 6.00 m across the floor. What was the initial speed of the ball?
A) 4.15 m/s B) 5.85 m/s C) 4.60 m/s D) 5.21 m/s E) 3.85 m/s
A 3.6
C charge is moved from a position where its electric potential energy is 7.2 my to a position where its potential energy is 1.8 my. What is the change in potential from the initial position to the final position?
A. 1500 V B. 2000 V C. -2000 V D. 3500 V E. -1500 V
Even though K- and M-type stars are suitable for life, why might they not have many habitable planets around them?
A) because their habitable zones are very wide B) because their habitable zones are very narrow C) because their lifetimes are too short D) because they contain too few heavy elements to form planets