An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 1000-m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?
a. 0.25
b. 0.50
c. 1.00
d. 2.00
e. 4.00
d
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If a neutral metal object has been charged by friction to a charge of one pC, what has happened to it electrically?
a. 
electrons have been added to it
b. 
protons have been added to it
c. 
electrons have been removed from it
d. 
protons have been removed from it
e. 
An iron rod becomes magnetic when
A) opposite ions accumulate at each end. B) its atoms are aligned. C) the net spins of many internal electrons are aligned. D) its electrons stop moving and point in the same direction.
A 2 000-kg sailboat experiences an eastward force of 4 500 N by the ocean tide and a wind force against its sails with magnitude of 1 500 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
a. 27° N of W b. 58° N of W c. 27° N of E d. 17° N of W e. 17° N of E
The flow of electrons in an electric circuit move by
A) bumping other electrons. B) colliding with molecules. C) interacting with an established electric field. D) none of the above