An automobile accelerates from zero to 30 m/s in 6.0 s. The wheels have a diameter of 1.0 m. What is the average angular acceleration of each wheel?
a. 5.0 rad/s2
c. 25 rad/s2
b. 10 rad/s2
d. 40 rad/s2
B
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A 50-N object falling in air experiences 50 N of air resistance. The amount of net force on the falling object is?
A. 0 N B. 25 N C. 50 N D. 100 N
Springs: An ornament of mass 40.0 g is attached to a vertical ideal spring with a force constant (spring constant) of 20.0 N/m. The ornament is then lowered very slowly until the spring stops stretching. How much does the spring stretch?
A. 0.00200 m B. 0.0196 m C. 0.0816 m D. 0.800 m E. 0.200 m
A certain factory whistle can be heard up to a distance of 2.5 km. Assuming that the acoustic output of the whistle is uniform in all directions, how much acoustic power is emitted by the whistle? The threshold of human hearing is 1.0 × 10-12 W/m2
A) 0.079 mW B) 0.26 mW C) 0.026 mW D) 2.6 mW E) 0.79 mW
A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. If the magnitude of the magnetic field is 0.285 mT at a point 4.0 mm from the axis of the wire and 0.200 mT at a point 10 mm from the axis, what is the radius of the wire?
a. 4.6 mm b. 7.1 mm c. 5.3 mm d. 12 mm e. 10 mm