Mastering Physics: HW-CH6 Google Chrome secure https://session.masteringphysics.
ID: 1559355 • Letter: M
Question
Mastering Physics: HW-CH6 Google Chrome secure https://session.masteringphysics.com/myct/itemview?offset next&assignmentProblemIDa75879293; Spring 2017 PHYS191 20997 LO4 HNALCH6 Item 2 Item 2. Part A Two blocks are connected by a very light string passing During this process, how much work is done on the 12.0-N block by gravity? over a massless and frictionless pulley (the figure (Eigure Traveling 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. Figure 1 of 1 Submit My Answers Give Up Part B During this process, how much work is done on the 12.0-N block by the tension in the string? 20.0 O 12.0 Submit My Answers Give Up Part C During this process, how much work is done on the 20.0-N block by gravity?Explanation / Answer
ma= mg - T---------for vertical falling block
T = mg ( as block is moving with costant velocity)
ma= T - f (where f is the force f friction)
T = f
a) work done by gravity = mgh = 12 (0.72)=8.64 J
b)ma= mg - T
as a= 0,
T = mg = 12(0.72) = 8.64 J
c) 0 J
d)W = 20(0.72) =14.4 J
e)-14.4 J
f)0 J