A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 turns through 2.4 revolutions during a 2.0-s time interval. What is the angular velocity at the end of this time interval?
A. 9.5 rad/s
B. 9.7 rad/s
C. 9.3 rad/s
D. 9.1 rad/s
E. 8.8 rad/s
Answer: A
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Ideal Gas Law: A certain automobile tire has a volume of 0.0185 m3. If the absolute (or total) pressure in the tire is 500 kPa and the temperature is 298 K, how many molecules are there inside the tire? (R = 8.31 J/mol ? K, NA = 6.022 × 1023 molecules/mol)
A. 2.25 × 1023 molecules B. 2.25 × 1024 molecules C. 3.25 × 1023 molecules D. 3.25 × 1024 molecules E. 3.25 × 1025 molecules
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The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 ?T. How far is point P from the wire? (?0 = 4? × 10-7 T ? m/A)
A) 10 cm B) 2.0 cm C) 5.0 cm D) 2.5 cm E) 4.0 cm