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2 years ago

How do I find time?

Physics

1 answer:

kari74 [83]2 years ago

6 0

Answer: 3

H = 45 m ,

time required for the stone

S = u.t+(1/2) g.t²

45 = (1/2) 9.81. t² since u( initial velocity) = 0 ; S =H.

t² = 9.17 s

t = 3.02 s

therefore answer is 3 m/s

if you satisfy with explanation, please give brainiest ;

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2 years ago

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To solve the problem, it is necessary to apply the concepts related to the kinematic equations of the description of angular movement.

The angular velocity can be described as

$\omega_f = \omega_0 + \alpha t$

Where,

$\omega_f =$ Final Angular Velocity

$\omega_0 =$ Initial Angular velocity

$\alpha =$ Angular acceleration

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$a = \alpha r$

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PART A ) Using our values and replacing at the previous equation we have that

$\omega_f = (94rpm)(\frac{2\pi rad}{60s})= 9.8436rad/s$

$\omega_0 = 63rpm(\frac{2\pi rad}{60s})= 6.5973rad/s$

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Replacing the previous equation with our values we have,

$\omega_f = \omega_0 + \alpha t$

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$\alpha = \frac{9.8436- 6.5973}{11}$

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$a = \alpha r$

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$\omega_f^2=\omega_0^2+2\alpha\theta$

Replacing with our values and re-arrange to find $\theta,$

$\theta = \frac{\omega_f^2-\omega_0^2}{2\alpha}$

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That is equal in revolution to

$\theta = 90.461rad(\frac{1rev}{2\pi rad}) = 14.397rev$

The linear displacement of the system is,

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