Answer:
<em>The input power is 200 W</em>
Explanation:
<u>Motor Efficiency</u>
The efficiency of a motor can be calculated as follows:
Where:
β = efficiency
Po = Output power
Pi = Input power
Solving for Pi:
The efficiency is β=0.75 and the output power is Po=150 W, thus the input power is:
The input power is 200 W
At some time during her drive she backed up with a substantial negative. ( backwards) acceleration. Since the pocket book is not physically connected to the seat it is free to move. Upon rapid negative acceleration the pocket book remains in its position while the car accelerates backwards away from it. this demonstrates Newtons 1st law of motion. The first law is the law of inertia. Which states, an object at rest. ( pocketbook) will remain at rest and an object in motion will continue in motion at constant velocity, unless acted upon by some outside force to change its motion.
Any force of 29.4 Newtons or greater can do it.
To obtain an acceleration northward is necessary than the west component of the first cable and the east component of the second cable be equal, otherwise the barge will head northwest or northeast.
So for the first cable the component to west is:
Fw = F1 * cos (30Âş) = 80*cos(30Âş)
And for the second cable the component to east is:
Fe = F2 * cos (20Âş) = F2*cos(20Âş)
Then to get a movement northward we need than Fw = Fe, so:
80*cos(30Âş) = F2*cos(20Âş)
F2 = 80*cos(30Âş)/cos(20Âş)
F2 = 73.73 N So the magnitude of the east cable should be 73.73 Newtons
Soup cans is the correct answer
