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anonymous
 one year ago
A man uses a lever jack to lift a 2.00 * 10^3 kg car to change a tire. Each stroke of the jack lift the car a distance of 5.00 * 10^3 m. The vertical displacement of the handle is 0.75 m for each stroke. How much total force does he use with each stroke of the jack?
A. 3.0 * 10^5 N
B. 2.9 * 10^6 N
C. 131 N
D. 19, 600 N
anonymous
 one year ago
A man uses a lever jack to lift a 2.00 * 10^3 kg car to change a tire. Each stroke of the jack lift the car a distance of 5.00 * 10^3 m. The vertical displacement of the handle is 0.75 m for each stroke. How much total force does he use with each stroke of the jack? A. 3.0 * 10^5 N B. 2.9 * 10^6 N C. 131 N D. 19, 600 N

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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1here we have to apply the virtual work principle, namely the motor work has to be equal to the resistive work. So we can write: \[F \cdot 5 \times {10^{  3}} = 2 \times {10^3} \times 0.75\] what is F?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1oops.. I have made a typo, here is the right formula: \[\Large F \cdot 5 \times {10^{  3}} = 2 \times {10^3} \times 9.81 \times 0.75\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1since we know the mass of our car, which is 2,000 Kg

anonymous
 one year ago
Best ResponseYou've already chosen the best response.02943000 ? so our solution is choice B?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1yes! That's right!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yay!! thank you!! :D
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