A heat engine having an efficiency of 0.20 takes in 2000 J of energy from the hot reservoir in one cycle. In the same time, how much work will it perform?
A. 0 J
B. 33,333 J
C. 400 J
D. 1000 J
E. 120 J
Answer: C
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Potential of Point-Charges: Three point charges, -2.00 ?C, +4.00 ?C, and +6.00 ?C, are located along the x-axis as shown in the figure. What is the electric potential (relative to infinity) at point P due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. -307 kV B. +307 k V C. -154 kV D. +154 kV E. 0.00 kV
What information do we know about the known exoplanets?
A) estimates of orbits and masses B) complete composition C) precise masses D) All of the above E) None of the above
One ______________ is defined as the distance to a star when the star exhibits a parallax of one second of arc
Fill in the blank(s) with correct word
An RL series circuit has the following components: 5.0-mH coil, 4.8-W resistor, 12-V battery, ammeter, and switch. After the switch is closed for a long time, find the final value of the current
a. 12 A c. 2.5 A b. 2400 A d. 58 A