Motion in a circle at constant speed is motion with
a. constant acceleration. b. constant velocity.
c. both of the above d. none of the above
d
RATIONALE: Both v and a are continuously changing direction and therefore not constant.
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Magnetic fields are produced by
A. constant electric currents. B. electric currents that vary sinusoidally with time. C. time-varying electric fields. D. all of the above. E. only (a) and (b) above.
Two identical sound producers will sound twice as loud as just one
a. True b. False Indicate whether the statement is true or false
Which would you expect to have a higher melting point: sodium chloride, NaCl, or aluminum oxide, Image?
A) The aluminum oxide has a higher melting point because it is a larger molecule and has a greater number of molecular interactions. B) NaCl has a higher melting point because it is a solid at room temperature. C) The aluminum oxide has a higher melting point because of the greater charges of the ions, and hence the greater force of attractions between them. D) The aluminum oxide has a higher melting point because of the covalent bonds within the molecule.
A convex lens has focal length f. If an object is located at "infinity" (very far away), the image formed is located at a distance from the lens
A) of 2f. B) between f and 2f. C) of f. D) between the lens and f. E) of infinity.