Longitudinal seismic body waves are known by the letter ______________
a. P
b. S
c. T
d. B
a
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What fundamental fact underlies the operation of essentially all electric motors?
A) Iron is the only element that is magnetic. B) A current-carrying conductor placed perpendicular to a magnetic field will experience a force. C) Opposite electric charges attract and like charges repel. D) A magnetic North pole carries a positive electric charge, and a magnetic South pole carries a negative electric charge. E) Alternating current and direct current are both capable of doing work.
What is necessary for convection to occur in a substance?
A) The substance must be subjected to a strong magnetic field. B) Dense material must be added to the substance. C) The substance is strongly shaken or disturbed by a strong wind. D) The substance is strongly cooled from underneath. E) The substance is strongly heated from underneath.
A car and driver have a total mass of 945 kg. While rounding a curve on a flat road at a speed of 29 m/s, the net force acting on the car and driver is determined to be 56,767.5 N. The radius of the curve is__________
Fill in the blank(s) with correct word
The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor. b. dragged by a force parallel to the floor. c. pulled by a force directed at an angle ? above the floor. d. pushed by a force directed at an angle ? into the floor. e. turned on its side and pushed by a force parallel to the floor.