9-A dentist Drill turns a 0.75 mm diameter bit at 5 x 10 rev/min. What is the linear speed of the cutting edge? When the drill is first turned on, it takes about 1/4 of a second to come to full speed. What is the average angular acceleration of the bit?

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9-A dentist Drill turns a 0.75 mm diameter bit at 5 x 10 rev/min. What is the linear speed of the
cutting edge? When the drill is first turned on, it takes about 1/4 of a second to come to full speed.
What is the average angular acceleration of the bit?
10-The blades of a fan running at low speed tumn at 250 rpm. When the fan is switched to high
speed, the rotation increases to 350 rpm in 5.75 seconds. What is the magnitude of the angular
acceleration of the blades? [low many revolutions do the blades go through while the fan is
accelerating?
0.508 rad/s²
1.34 revolutions
- - กระจัด มม
Martãos (rad)
( - ความเร็วเข็ง ม
C
- - ความเร็ว เ
urso
(rad/s)
(Gad (82)
to
=
6
36
to 19
- ho
hay
250 rpm
2.
5.75
3 50 r
rpm
Transcribed Image Text:9-A dentist Drill turns a 0.75 mm diameter bit at 5 x 10 rev/min. What is the linear speed of the cutting edge? When the drill is first turned on, it takes about 1/4 of a second to come to full speed. What is the average angular acceleration of the bit? 10-The blades of a fan running at low speed tumn at 250 rpm. When the fan is switched to high speed, the rotation increases to 350 rpm in 5.75 seconds. What is the magnitude of the angular acceleration of the blades? [low many revolutions do the blades go through while the fan is accelerating? 0.508 rad/s² 1.34 revolutions - - กระจัด มม Martãos (rad) ( - ความเร็วเข็ง ม C - - ความเร็ว เ urso (rad/s) (Gad (82) to = 6 36 to 19 - ho hay 250 rpm 2. 5.75 3 50 r rpm
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