a 182 kg refrigerator is loaded onto a moving van by pushing it up a 6.0 m ramp inclined at an angle of 12?
Marcus S
a 182 kg refrigerator is loaded onto a moving van by pushing it up a 6.0 m ramp inclined at an angle of 12 degrees. how much work was done?
a 182 kg refrigerator is loaded onto a moving van by pushing it up a 6.0 m ramp inclined at an angle of 12 degrees. how much work was done?
a. 227 joules
b. 1068 joules
c. 2225 joules
d. 10,500 joules
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No mention is made of friction. Therefore, the work done is due to changing the gravitational potential energy of the fridge, where
PE = m*g*h, where
PE = potential energy in Joules
m = mass in kg
g = earth gravitational acceleration, 9.81m/s^2
h = height in meters
The height of the ramp can be determined from trig. Since sine = opp/hyp, and the opposite side = height,
opp = height = hyp*sine = 5.0m*sine(12) = 1.247m.
PE = m*g*h = 182kg * 9.81m/s^2 * 1.247m = 2225J (c)
As in your other problem, work = potential energy
W = 182 (9.8) (6 * sin 12)
W = 2225 joules (option c)