A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?
a. 9.9 s
b. 7.8 s
c. 8.5 s
d. 9.2 s
e. 6.4 s
C
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A grandfather clock keeps time using a pendulum whose length is finely adjustable. If you have a grandfather clock that is running fast, should you shorten or lengthen the pendulum?
A. Shorten it B. Lengthen it C. You should reduce its mass D. You should add mass to it
When current reverses direction in a wire, the surrounding magnetic field
A) also reverses direction. B) becomes momentarily stronger. C) contracts. D) expands.
The COBE satellite was designed to image the microwave cosmological background radiation and thus study the earliest stages of the universe
Indicate whether the statement is true or false
The strong force depends upon the electric charge of the particles involved
a. True b. False Indicate whether the statement is true or false