Processes in which one type of quark is converted into another type of quark involve which force?
a. electromagnetic b. strong force
c. weak force d. gravitational
c
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A convex lens has focal length f. An object is placed at 2f on the axis. The image formed is located
A) between 2f and infinity. B) at 2f. C) between f and 2f. D) at f.
Equilibrium: If an object remains at rest, then the sum of both the external torques and the external forces on the object must be zero.
A. True B. False
The type of EM radiation that has wavelength just a bit shorter than that of visible light is
a. ultraviolet b. infrared c. x ray d. microwave e. gamma ray
Which of the following steps is NOT involved in drownproofing?
A. Swim 10 meters closer to the shore and then relax. B. Straighten the legs, press arms down, and then inhale. C. Every 5 to 10 seconds, raise arms, separate legs to lift the mouth above the water, and exhale." D. Relax in the rest position.