A gasoline engine absorbs 2500 J of heat and performs 1000 J of mechanical work in each cycle. The efficiency of the engine is
A. 80%.
B. 40%.
C. 60%.
D. 20%.
E. 50%.
Answer: B
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An incompressible fluid is flowing through a horizontal pipe with a constriction. The velocity of the fluid in the wide section of the pipe is 5.00 m/s and the velocity of the fluid in the narrow section of pipe is 8.00 m/s. The pressure of the fluid in the wide section is 200 kPa. What is the pressure in the narrow section of the pipe? (density of the fluid is 
A. 155 kPa B. 160 kPa C. 175 kPa D. 187 kPa E. 207 kPa
A girl on a bicycle takes 15.0 s to ride half way around a circular track of radius 10.0 m (Figure 3.4). (a) What is the girl’s average speed? (b) What is the magnitude of her average velocity?
What will be an ideal response?
The slope of a distance vs. time graph is the
a. distance. b. velocity. c. acceleration. d. none of the above.
The ________-type seismic waves can travel through liquids and solids. The ________-type seismic waves can travel through solids only.
A. P; S B. S; S C. S; P D. P; P