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.

Physics & Space Science

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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.

Physics & Space Science

Two identical sound producers will sound twice as loud as just one

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science