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koban [17]
4 years ago
7

A Ferris wheel is a vertical, circular amusement ride with radius 9.5 m. Riders sit on seats that swivel to remain horizontal. T

he Ferris wheel rotates at a constant rate, going around once in 7.6 s. Consider a rider whose mass is 57 kg.
At the bottom of the ride, what is the rate of change of the rider's momentum?
Physics
1 answer:
Kruka [31]4 years ago
4 0

Answer:

928.34 N

Explanation:

Radius=r=9.5 m

Time period of revolution=T=7.6 s

Mass of rider=m=57 kg

We have to find the rate of change of the rider's momentum at the bottom of the ride

According to Newton's second law of motion

F_{net}=ma_c

N-mg=mr\omega^2

N=mg+mr(\frac{2\pi}{T})^2

Where \pi=3.14,g=9.8 m/s^2

Using the formula

N=57\times 9.8+57\times 9.5(\frac{2\times 3.14}{7.6})^2

N=928.34 N

Hence, the rate of change of the rider's momentum=928.34 N

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mina [271]

Answer:

The speed of the sled is 9.2 m/s

The speed of the boulder is 0.82 m/s

Solution:

As per the question:

Mass of the boulder, m_{B} = 1000\ kg

Mass of the sled, m_{S} = 2.50\ kg

Mass of the boy, m_{b} = 40\ kg

Initial Velocity, v = 10.0 m/s

Now,

To calculate the speed of both the sled and the boulder after the occurrence of the collision:

m = m_{b} + m_{S} = 40 + 2.50 = 42.50\ kg

Initial velocity of the boulder, v_{B} = 0\ m/s

Since, the collision is elastic, both the energy and momentum rem,ain conserved.

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Using the conservation of momentum:

mv + m_{B}v_{B} = mv' + m_{B}v'_{B}

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v' = final velocity of the the system of boy and sled

v'_{B} = final velocity of the boulder

42.50\times 10 + m_{B}.0 = 42.50v' + 1000v'_{B}

42.50v' + 1000v'_{B} = 425            (1)

Now,

Using conservation of energy:

\frac{1}{2}mv^{2} + \frac{1}{2}m_{B}v_{B}^{2} = \frac{1}{2}mv'^{2} + \frac{1}{2}m_{B}v'_{B}^{2}

42.50\times 10^{2} + m_{B}.0 = 42.50v'^{2} + 1000v'_{B}^{2}

42.50v'^{2} + 1000v'_{B}^{2} = 4250         (2)

Now, from  eqn (1) and (2):

v' = \frac{m - m_{B}}{m + m_{B}}\times v

v' = \frac{42.50 - 1000}{42.5 + 1000}\times 10 = - 9.2\ m/s

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v'_{B} = \frac{2m}{m + m_{B}}\times v

v'_{B} = \frac{2\times 42.50}{42.5 + 1000}\times 10 = 0.82\ m/s

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3 years ago
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umka2103 [35]

Answer:

The phase difference between these two waves is 141.1⁰

Explanation:

The displacement of the wave is given as;

Y = y_xSin(Kx - \omega t)+y_xSin(Kx- \omega t + \phi)\\\\Y = 2y_xCos(\frac{1}{2} \phi)Sine(Kx- \omega t + \frac{1}{2} \phi)

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Why do we need to have an understanding about impulse and momentum ?
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Formula p=f t
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Formula p=m v
P=momentum
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