Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
a. it is passing car A.
b. it has the same linear (tangential) acceleration as car A.
c. it has the same centripetal acceleration as car A.
d. it has the same total acceleration as car A.
e. it has traveled farther than car A since starting.
c
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Intensity of Sound: What is the ratio of the intensities of two sounds with intensity levels of 70 dB and 40 dB?
A. 10:1 B. 100:1 C. 1000:1 D. 10,000:1
A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0. The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
A. 0.25 m/s2 B. 0.50 m/s2 C. 0.14 m/s2 D. 0.34 m/s2 E. 0.20 m/s2
If the Earth rotated more slowly so that the length of a day was longer, the radius of a communications satellite in synchronous orbit would be ________.
Fill in the blank(s) with the appropriate word(s).
A proton is an example of
A) a lepton. B) a meson. C) a baryon. D) a gauge boson. E) none of the above.