What is the sum of 2.67 + 1.976 + 2.1 expressed to the correct number of significant figures?
A) 6.7
B) 6.75
C) 6.746
D) 6.7460
A
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A bullet is fired into a wall and comes to rest. Considering only the bullet as the system we can say that
A. neither total kinetic energy nor momentum is conserved. B. both total kinetic energy and momentum are conserved. C. the momentum is conserved. D. the total kinetic energy is conserved.
Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. The tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 N. What is the tension in wire A?
A) 87.5 N B) 245 N C) 280 N D) 333 N E) 517 N
A student uses a plumb bob to verify that the doorjamb in a car is vertical. As the car pulls away from a stop, the student observes that the string now makes an angle ? with the doorjamb. What is the acceleration of the car?
A) g sin ? B) g cos ? C) g tan ? D) g ? E) ?
Which one of the following experiments is the justification for the wave theory of light?
A) Frank-Hertz experiment B) Newton's rings experiment C) Huygens' experiment D) Young's double slit experiment E) none of the above