Stress is
A)
the strain per unit length.
B)
the same as force.
C)
the ratio of the change in length to the original length.
D)
applied force per cross-sectional area.
E)
the ratio of elastic modulus to strain.
D
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The distance to the sun is about 150 million km. Expressed in powers of ten, this is
A) 1.5 × 106 km. B) 1.5 × 108 km. C) 1.5 × 10-8 km. D) 1.5 × 10-6 km. E) None of the above.
A car originally traveling at 30 m/s manages to brake for 5.0 seconds while traveling 125 m downhill. At that point the brakes fail. After an additional 5.0 seconds it travels an additional 150 m down the hill. What was the acceleration of the car after the brakes failed?
A heat engine with an efficiency of 30% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?
A) 7100 J B) 8300 J C) 750 J D) 5800 J E) 1400 J
The top of the thermosphere is called the
a. stratopause. b. tropopause. c. mesopause. d. thermopause.