A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is ? = 0.25 . If the car maintains a constant speed of 40 m/s, it will
a. attempt to dig into the road surface.
b. tend to veer toward the center of the semicircle.
c. arrive safely at the end of the semicircle.
d. tend to veer toward the outside of the circle.
e. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.
d
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Beats: Two strings both vibrate at exactly 819 Hz. The tension in one of them is then increased slightly. As a result, six beats per second are heard when both strings vibrate. What is the new frequency of the string that was tightened?
A. 825 Hz B. 813 Hz C. 822 Hz D. 816 Hz
Electrical forces between charges are strongest when the charges are
a. far apart b. close together c. the electrical force is constant everywhere
If a vector's components are all negative, then the magnitude of the vector is negative
A) True B) False
The universe is made mostly of
A) dark energy. B) dark matter. C) neutrinos. D) pizza. E) ordinary matter.