A 200-? resistor is rated at 1/4 W. What is the maximum voltage that can safely be connected across it?
A) 0.71 V
B) 7.1 V
C) 50 V
D) 0.25 V
B
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Water is flowing through a pipe with a constriction. The area of the narrow section is one-half the area of the wide section. If the velocity of the incompressible fluid is 3.2 m/s in the wide section, then what is the velocity of the fluid in the narrow section?
A. 6.4 m/s B. 5.9 m/s C. 5.0 m/s D. 4.7 m/s E. 4.2 m/s
The density of aluminum is 2.7 × 103 kg/m3. The speed of longitudinal waves in an aluminum rod is measured to be 5.1 × 103 m/s. What is the value of Young's modulus for aluminum?
A) 7.0 × 1010 N/m2 B) 7.0 × 107 N/m2 C) 2.2 × 1011 N/m2 D) 2.2 × 109 N/m2 E) 1.4 × 107 N/m2
The Big Bang theory can explain
A. the relative abundance of helium in the Universe B. the expansion of the Universe C. the cosmic microwave background radiation D. All of these choices are correct.
A uniform rod is 3.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 27° above the horizontal. What is the angular speed of the rod as it passes through the horizontal position?
a. 3.0 rad/s b. 2.8 rad/s c. 2.1 rad/s d. 2.5 rad/s e. 3.4 rad/s