ysics For scientists An x a Amazon.com: Baions se wi Chapter 7. Energy of as x S

Question

ysics For scientists An x a Amazon.com: Baions se wi Chapter 7. Energy of as x Secure l https://www.webassign.net/web/Student/Assignment-Responses/ast?depa15675358 29 Tips To Get Rid of Things Didn't know f K O Going to make 10 points serPSE9 7 P002 w A raindrop of mass 33 x 10 s kg falls vertically at constant speed under the influence of gravity and air resistance. Model the drop as a particle. (a) As it falls 95 m, what is the work done on the rain by the gravitational force? drop b) What is the work done on the rain by air resistance? drop Need Help? Read Lweteh a Show My Work toe onal E9 P 005 A block of mass m 40 kg is pushed a distance d 2.20 m along a frictionless, horizontal table by a constant applied force of magnitude F N c 20 o below the horizontal as shown in the figure below.

Explanation / Answer

as it is falling at constant speed, force due to gravity=force of air resistance

==>mass*g=force due to air resistance

==>force due to air resistance=3.33*10^(-5)*9.8=3.2634*10^(-4) N

part a:

gravitational force is along the same direction as displacement.

hence angle =theta=0 degrees

then work done=force*distance*cos(angle)

=3.2634*10^(-4)*95*cos(0)=31*10^(-3) J

part B:

as air resistance is opposite direction to that of displacement, angle=180 degrees

work done=3.2634*10^(-4)*95*cos(180)=-31*10^(-3) J

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