9. A 50 kg physics i student trudges from the 1st floor to the 3rd floor, going up a total height of 13 m.
1 answer:
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Answer:
0.231 N
Explanation:
To get from rest to angular speed of 6.37 rad/s within 9.87s, the angular acceleration of the rod must be
If the rod is rotating about a perpendicular axis at one of its end, then it's momentum inertia must be:
According to Newton 2nd law, the torque required to exert on this rod to achieve such angular acceleration is
So the force acting on the other end to generate this torque mush be:
Answer:
0.0545 m/s2
Explanation:
19.2 cm = 0.192 m
We can convert rpm (revolution per minute) to angular velocity rad/s knowing that each revolution is 2π rad and each minute is 60 seconds.
57 rpm = 57 * 2π / 60 = 6 rad/s
86 rpm = 86 * 2π / 60 = 9 rad/s
The angular acceleration of the sprocket is the change in angular velocity per unit of time
The tangential acceleration of the pedal is the product of its angular acceleration and the radius of rotation, aka the pedal arm length L = 0.192 m