Disk brakes, such as those in your car, operate by using pressurized oil to push outward on a piston. The piston, in turn, presses brake pads against a spinning rotor or wheel, as seen in Figure 3. Consider a 16 kg industrial grinding wheel, 26 cm in diameter, spinning at 900 rpm. The brake pads are actuated by 2.1-cm-diameter pistons, and they contact the wheel at an average distance of 11 cm from the axis. If the coefficient of kinetic friction between the brake pad and the wheel is 0.59, what oil pressure is needed to stop the wheel in 4.8 s?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Disk brakes, such as those in your car, operate by using pressurized oil to push outward on a piston. The piston, in turn, presses brake pads against a spinning rotor or wheel, as seen in Figure 3. Consider a 16 kg industrial grinding wheel, 26 cm in diameter, spinning at 900 rpm. The brake pads are actuated by 2.1-cm-diameter pistons, and they contact the wheel at an average distance of 11 cm from the axis. If the coefficient of kinetic friction between the brake pad and the wheel is 0.59, what oil pressure is needed to stop the wheel in 4.8 s?

10 kg floating piston
4.0 сm
Rotating
disk
Brake pad
Oil
Oil
100 cm
20 cm
2.0 m
Piston
Oil
Oil
60 cm
B
Fig.1
Fig.2
Transcribed Image Text:10 kg floating piston 4.0 сm Rotating disk Brake pad Oil Oil 100 cm 20 cm 2.0 m Piston Oil Oil 60 cm B Fig.1 Fig.2
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