A heat engine receives 6000 J of heat from its combustion process and loses 3600 J through the exhaust and friction. What is its efficiency?
a. 33%
c. 67%
b. 40%
d. 73%
B
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The simplest life forms appeared on Earth when it was how old?
A) five million years B) one billion years C) 2.5 billion years D) 3.5 billion years E) 4.5 billion years
An extremely long thin wire carries a uniform linear charge density of 358 nC/m
Find the potential difference between points 5.0 m and 6.0 m from the wire, provided they are not near either end of the wire. (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 0.215 kV B) 1.2 kV C) 6.0 kV D) 0.21 kV
As measured from the Earth, a spacecraft is moving at speed 0.80c toward a second spacecraft moving at speed 0.60c back toward the first spacecraft. What is the speed of the first spacecraft as viewed from the second spacecraft?
a. 0.81c c. 0.38c b. 0.95c d. 0.20c
If an iron-0.77 % C steel is very rapidly cooled from 800°C to room temperature, the expected microstructure is described as _____________.
Fill in the blank(s) with the appropriate word(s).