Both sections of rod ABC are circular and solid with diameters d 100 mm AB = and d 50 mm BC = . Determine the maximum shear stre
ss in the member and the angle of twist from A to C. Take the shear modulus of the material comprising the bar as G 32 GPa. = Torques are applied at the at the tail ends of the arrows.
1 answer:
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Answer:
9.43 m/s
Explanation:
First of all, we calculate the final kinetic energy of the car.
According to the work-energy theorem, the work done on the car is equal to its change in kinetic energy:
where
W = -36.733 J is the work done on the car (negative because the car is slowing down, so the work is done in the direction opposite to the motion of the car)
is the final kinetic energy
is the initial kinetic energy
Solving,
Now we can find the final speed of the car by using the formula for kinetic energy
where
m = 661 kg is the mass of the car
v is its final speed
Solving for v, we find
The runner has initial velocity vector
and acceleration vector
so that her velocity at time is
She runs directly east when the vertical component of is 0:
It's not clear what you're supposed to find at this particular time... possibly her position vector? In that case, assuming she starts at the origin, her position at time would be
so that after 10.4 s, her position would be
which is 19.9 m away from her starting position.