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viktelen [127]
2 years ago
7

How to find the magnitude and direction of a resultant velocity?

Physics
1 answer:
mixas84 [53]2 years ago
5 0
Find the horizontal components vcos30 ...one goes right and one goes left so they cancel each other.
Find vertical components vsin30.....there are two of them.... so 2vcos30....hey presto... resultant velocity = 2vCos30
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The third floor of a house is 8m above street level. How much work is needed to move a 136kg refrigerator to the third floor?
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m = Mass of the refrigerator to be moved to third floor = 136 kg

g = Acceleration due to gravity by earth on the refrigerator being moved = 9.8 m/s²

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Work done in lifting the object is same as the gravitational potential energy gained by the refrigerator. hence

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W = m g h

inserting the values

W = (136) (9.8) (8)

W = 10662.4 J



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