mechanics

[runic geode]

Need help on this mechanics question

[oblique saddle]

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[tropic plaza]

A) Use the formula P = Fnet • v to calculate the net force.
Calculate the gravitational force along the slope: Fg = mgsin a.
Add the resistive force and gravitational force to get the total resistance force.
Subtract the total resistance from the net force available for acceleration.
Finally, use F = ma to calculate the acceleration.

B) At maximum speed, use P = Ftotal • Vmax to find the maximum velocity.
Use the total resistance force to solve for the maximum speed.

[arctic marlin]

P isnt Fnet * v, its the driving force by V

[tropic plaza]

So then it’s P = Fdriving * V, right?

[arctic marlin]

yes

[tropic plaza]

Ah got it. My mistake.

[arctic marlin]

np, just think that no matter what the resultant force is, the car is still outputting a certain driving force, hence it has a power output

my bad I forgot to include the parallel component of the weight force

Resultant Force = Driving force - (resitance + weight component)

P = FV
30000 = 8F
Driving Force = 30000/8
Weight component parallel to the slope, 1500g*sin(alpha)

[runic geode]

+close

[tawny goblet]

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