Two blocks are connected by a very light string passing over a massless and frictionless pulley (Fig. E6.7). Travelling at constant speed, the 20.0-N block moves 72.0 cm to the right and the 12.0-N block moves 72.0 cm downward. How much work is done:  a. On the 12.0-N block by Gravity The tension in the string b. How much work is done on the 20.0-N block by  Gravity The tension in the string Friction The normal force c. Find the total work done on each block

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Chapter1: Units, Trigonometry. And Vectors
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Two blocks are connected by a very light string passing over a massless and frictionless pulley (Fig. E6.7). Travelling at constant speed, the 20.0-N block moves 72.0 cm to the right and the 12.0-N block moves 72.0 cm downward. How much work is done: 

a. On the 12.0-N block by

  1. Gravity
  2. The tension in the string

b. How much work is done on the 20.0-N block by 

  1. Gravity
  2. The tension in the string
  3. Friction
  4. The normal force

c. Find the total work done on each block

6.7 · Two blocks are con- Figure E6.7
nected by a very light string
passing over a massless and
frictionless pulley (Fig. E6.7).
Traveling at constant speed,
the 20.0-N block moves 72.0 cm
20.0
N
120
to the right and the 12.0-N
block moves 72.0 cm down-
ward. How much work is done
(a) on the 12.0-N block by (i) gravity and (ii) the tension in the
string? (b) How much work is done on the 20.0-N block by
O gravity, (ii) the tension in the string, (iii) friction, and (iv) the
normal force? (c) Find the total work done on each block.
Transcribed Image Text:6.7 · Two blocks are con- Figure E6.7 nected by a very light string passing over a massless and frictionless pulley (Fig. E6.7). Traveling at constant speed, the 20.0-N block moves 72.0 cm 20.0 N 120 to the right and the 12.0-N block moves 72.0 cm down- ward. How much work is done (a) on the 12.0-N block by (i) gravity and (ii) the tension in the string? (b) How much work is done on the 20.0-N block by O gravity, (ii) the tension in the string, (iii) friction, and (iv) the normal force? (c) Find the total work done on each block.
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