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posted by  Linh on 10/1/2007 4:48:43 PM  |  status: Live  

Cutnell Physics 7th edition. Ch. 7 #14

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A dump truck is being filled with sand. The sand falls straight downward from rest from a height of 2.00 m above the truck bed, and the mass of sand that hits the truck per second is 55.0 kg/s. The truck is parked on the platform of a weight scale. By how much does the scale reading exceed the weight of the truck and sand?
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posted by Gorilla :) on 10/3/2007 12:22:52 AM  |  status: Live
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Linh's comment:
"What is the asnwer? 344.3 N or 433.3N"
Response Details:
Vf = the square root of 2*g*Hf            g=9.8   Hf=2.00m
Vf=the square root of 2*9.8*2
Vf=6.26m/s
F=M(v1-Vo)/ change in time
F=55kg*(6.26-0)
F=344.3N
The scale exceeds the weight of the truck and sand 433.3N
rate well please!!!!
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