# 1 - A man pushes a lawn mower on a level lawn with a force of 193 N. If 31% of
ID: 2096637 • Letter: #
Question
# 1 - A man pushes a lawn mower on a level lawn with a force of 193 N. If 31% of this force is directed downward, and 62 W of power is expended in pushing the mower 5.1 m, how much time is spent in pushing the mower this distance?
# 2 - A reflecting, spherical Christmas tree ornament has a diameter of 9.0 cm. A child looks at the ornament from a distance of 24 cm.Describe the image she sees. Where is the image located
#3 A spherical concave lens has a focal length of 40 cm, and an object is placed 20 cm from the lens. Draw a ray diagram. (Submit a file with a maximum size of 1 MB.)
Estimate the image distance?
#4 Sketch a ray diagram for a spherical convex lens with an object at Do = 2f. (Submit a file with a maximum size of 1 MB.)
Explanation / Answer
Power = Work/time
Here
Horizontal Component of Force = 193*(100-31)/100
= 133.17 N
Thereforte
Work Done = Force in Horizontal Direction*Displ;acement
Therefore
Worlk Done = 133.17*5.1
= 679.167 J
Therefore
Power = 62 = 679.167/t
t = 10.954 sec
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