Induction: Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state
A. spheres #1 and #2 are still uncharged.
B. sphere #1 carries positive charge and #2 carries negative charge.
C. sphere #1 carries negative charge and #2 carries positive charge.
D. spheres #1 and #2 both carry positive charge.
E. spheres #1 and #2 both carry negative charge.
Answer: B
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A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block
a. 4.2 N b. 3.0 N c. 3.4 N d. 3.8 N e. 2.3 N
A stone is thrown straight up. What is its acceleration on the way down?
What will be an ideal response?
Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
a. each body exerts an equal and opposite force on the other during the collision. b. the forces act during equal time intervals. c. the law of conservation of momentum for an isolated system is a vector equation. d. of all of the above. e. of only (a) and (b) above.
Conversion of Units: If you are 5'10'' tall, what is your height in meters? (2.54 cm = 1.00 in.)
A. 1.5 m B. 1.6 m C. 1.7 m D. 1.8 m