Which of the following lies halfway between the celestial poles?
A) The celestial north point
B) The celestial zenith
C) The celestial equator
D) The celestial south point
C
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A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s2 over a 5.0-s interval. What is the tangential component of acceleration for a point on the outer edge of the tire during the 5.0-s interval?
a. 33 m/s2 b. 6.7 m/s2 c. 0.60 m/s2 d. 0.30 m/s2
A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of
A) 0 m/s. B) 3 m/s. C) 4 m/s. D) 6 m/s.
A driver in a car traveling at slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
A) 26 m B) 21 m C) 33 m D) 24 m
A hydrogen atom consists of an electron (with negative charge) orbiting a proton (with positive charge). With the conventional definition of the reference position for electrostatic potential energy, the electrostatic potential energy for this system
A. is positive. B. is zero. C. is negative. D. depends on how fast the electron is moving.