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GuDViN [60]
3 years ago
14

A bicycle wheel of radius 14 cm is mounted at the middle of an axle 96 cm long. The tire and rim weigh 23 N. The wheel is spun a

t 12 rev/s, and the axle is then placed in a horizonal position with one end resting on a pivot
a. What is the magnitude of the angular momentum due to the spinning of the wheel? (Treat the wheel as a hoop.)
b. What is the angular speed of precession? rad/s How long does it take for the axle to swing through 360 degree around the pivot?
c. What is the magnitude of the angular momentum associated with the motion of the center of mass, that is, due to the d. precession? In what direction is this angular momentum? up up or down, depending on the direction of in part (a) down
Physics
1 answer:
ollegr [7]3 years ago
8 0

Answer:

a. L =3.465 J.s

b. 3.186 rad/s

c. T =  1.972 s

d. Lp = 0.022 J.s; up or down, depending on the direction of L

Explanation:

(a)We have the formula for angular momentum as

L = I*w where I = moment of inertia = M*R^2

L = (23/9.81) * 0.14^2* (24*pi) J.s = 3.465 J.s

(b) ω = M*g*D/L

where D = L/2 = 0.96/2 = 0.48m

ω = (23* 0.48/3.465) rad/s = 3.186 rad/s

(c) T = 2π/ω

T = 2*π/3.186 s = 1.972 s

(d) Lp = M*D^(2*w)

Solving with mass M, D and angular velocity ω

Lp = 0.022 J.s; up or down, depending on the direction of L

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vazorg [7]

As per angular momentum conservation we can say

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3 years ago
Use the definition of scalar product, a with arrow · b with arrow = ab cos θ, and the fact that a with arrow · b with arrow = ax
Zolol [24]

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3 years ago
The greatest number of thunderstorms occur in the _____.
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3 years ago
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At a beach the light is generallypartially polarized owing to reflections off sand and water. At a particular beach on a particu
Ne4ueva [31]

Answer:

a) 0.159

b) 0.84

Explanation:

The Horizontal component is 2.3 times the vertical component

Let the horizontal electric field component = E_{h}

Let the vertical electric field component = E_{v}

The formula for light intensity is given by:

I = \frac{E_{m} ^{2} }{2c \mu}..............................(1)

E_{m} is the resolution of the vertical and horizontal components, E_{h} and    E_{v}

E_{m} ^{2} = E_{h} ^{2} + E_{v} ^{2}..................(2)

Light intensity before the glasses were put on:

I_{1}  = \frac{E_{m} ^{2} }{2c \mu_{1} }.............................(3)

Put equation (2) into equation (3)

I_{1}  = \frac{E_{h} ^{2} + E_{v} ^{2}}{2c \mu_{1} }.............................(4)

After the glasses were put on the horizontal component vanishes, i.e. E_{h} = 0

I_{2}  = \frac{ E_{v} ^{2}}{2c \mu_{2} }...................................(5)

Divide equation (5) by equation (4)

\frac{I_{2} }{I_{1} } = \frac{E_{v} ^{2} }{E_{h} ^{2} + E_{v} ^{2}}...............................(6)

But E_{h} = 2.3E_{v}......................(7)

Insert equation (7) into (6)

\frac{I_{2} }{I_{1} } = \frac{E_{v}^{2}  }{(2.3E_{v})^{2}   + E_{v} ^{2}   } \\\frac{I_{2} }{I_{1} } =  \frac{E_{v}^{2}  }{5.29E_{v}^{2}   + E_{v} ^{2}   }\\\frac{I_{2} }{I_{1} } =  \frac{E_{v}^{2}  }{6.29E_{v}^{2}  }\\\frac{I_{2} }{I_{1} } =\frac{1}{6.29} \\

\frac{I_{2} }{I_{1} }= 0.159

b) When the sunbather lies on his side, the vertical component vanishes, i.e E_{v} = 0

\frac{I_{2} }{I_{1} } = \frac{E_{h} ^{2} }{E_{h} ^{2} + E_{v} ^{2}}

\frac{I_{2} }{I_{1} } = \frac{(2.3E_{v} )^{2}  }{E_{v} ^{2} +(2.3E_{v} )^{2}}

\frac{I_{2} }{I_{1} } = \frac{5.29E_{v}^{2}  }{E_{v} ^{2} +5.29E_{v}^{2} }

\frac{I_{2} }{I_{1} } = \frac{5.29E_{v}^{2}  }{6.29E_{v}^{2} }\\\frac{I_{2} }{I_{1} } = \frac{5.29}{6.29} \\\frac{I_{2} }{I_{1} } = 0.84

8 0
3 years ago
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