eyPLUS Halliday, Fundamentals of Open Assignmment your answer is partially corre
ID: 1773629 • Letter: E
Question
eyPLUS Halliday, Fundamentals of Open Assignmment your answer is partially correct, try again. A cord is used to vertically lower an initially stationary block of massM-1.6 kg at a constant downward acceleration of g/7. When the block has fallen a distance d-4.8m, find (a) the work done by the cord's force on the block, (b) the work done by the gravitational force on the block, (c) the kinetic energy of the block, and (d) the speed of (Note : Take the downward direction positive) (o) Numbal Units (b) Num (d) Number SHOW HINT LINK TO TEXT TO SAMPLE PROB LEM By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructorExplanation / Answer
From the given question,
mass of block(M)=1.6 kg
downward acceleration(a)= g/7
distance travelled by block(d)=4.8 m
initial velocity(u)=0 m/s
Mg - T = Ma
T= M(g-a)
T=M(g-7/7)
=1.6 *6*9.8/7
=13.44 N
a) work done by cords force on the block = 13.44 * 4.8
=64.5 J
b) work done by gravitational force on block= Mg*d
=1.6*9.8*4.8
=75.3 N
c) v2=u2+2as
v=[02 + 2*(9.8/7)*4.8]1/2
v=3.67 m/s
kinetic energy= (1/2)mv2
=10.8 J
d) speed of block= 3.67 m/s ( calculated in part c)
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