You get a haircut that costs $23. You want to tip the barber 10%. How much tip will you leave him?
2 answers:
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Answer:
2) 162°, 72°, 108°
3) 144°, 54°, 126°
Step-by-step explanation:
1) Multiply the equation by 2sin(θ) to get an equation that looks like ...
sin(θ) = <some numerical expression>
Use your knowledge of the sines of special angles to find two angles that have this sine value. (The attached table along with the relations discussed below will get you there.)
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2, 3) You need to review the meaning of "supplement".
It is true that ...
sin(θ) = sin(θ+360°),
but it is also true that ...
sin(θ) = sin(180°-θ) . . . . the supplement of the angle
This latter relation is the one applicable to this question.
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Similarly, it is true that ...
cos(θ) = -cos(θ+180°),
but it is also true that ...
cos(θ) = -cos(180°-θ) . . . . the supplement of the angle
As above, it is this latter relation that applies to problems 2 and 3.
Answer:r'=0.327 m
Step-by-step explanation:
Given
angular velocity
mass of objects
distance of objects from stool
Combined moment of inertia of stool and student
Now student pull off his hands so as to increase its speed to 3.60 rev/s
Initial moment of inertia of two masses
After Pulling off hands so that r' is the distance of masses from stool
Conserving angular momentum