Longitudinal seismic body waves are known by the letter ______________
a. P
b. S
c. T
d. B
a
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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.
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.
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.