A ball is pushed downhill with an initial velocity of 3.0 m/s. The ball rolls down a hill with a constant acceleration of 1.6 m/s2 . The ball reaches the bottom of the hill in 6.0 s. What is the ball's velocity at the bottom of the hill?
a. 10 m/s b. 13 m/s
c. 16 m/s d. 17 m/s
b
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What conditions are necessary for an annular solar eclipse?
A) New Moon on equator at perigee B) Full Moon on ecliptic at perihelion C) New Moon on ecliptic at perigee D) New Moon on equator at apogee E) New Moon on ecliptic at apogee
Which of the following statements about electrical charge is true?
A) Two negative charges will attract each other. B) Two positive charges will attract each other. C) A positive charge and a negative charge will repel each other. D) A positive charge and a negative charge will attract each other.
Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0 . What is the distance to Proxima Centauri in units of pc?
a. 0.1 b. 10^0.1 c. 10^–0.1 d. None of the other choices are correct.
An equipotential surface must be
A) parallel to the electric field at any point. B) perpendicular to the electric field at any point. C) randomly oriented with respect to the electric field. D) equal to the electric field at any point.