A 3.0-kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37° above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?
A. ?34 J
B. ?64 J
C. ?30 J
D. ?94 J
E. +64 J
Answer: A
You might also like to view...
Why is light variability a critical issue with the sizes of active nuclei?
What will be an ideal response?
A fission reaction in which more neutrons are given off than are needed to initiate the reaction is called
A) a critical reaction. B) a chain reaction. C) a fusion reaction. D) a neutron catastrophe. E) a chemical reaction.
Tuning forks #1, #2, and #3 each have slightly different frequencies.When #1 and #2 are sounded together, a beat frequency of 3 Hz results. When #2 and #3 are sounded together, a beat frequency of 5 Hz results. If the frequency of #1 is 100 Hz, which of the following cannot be the frequency of #3?
a. 92 Hz b. 95 Hz c. 98 Hz d. 102 Hz e. 108 Hz
An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of -10 µC carefully placed at the center of the sphere through a hole in the latter's surface. With the charge in place, what charge is now present on the outside surface of the sphere?
a. zero c. +4000 µC b. -10 µC d. +10 µC