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2 years ago

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What is meant by a quantity ? Mention any three system of unit that you know to measure a

1 answer:

d1i1m1o1n [39]2 years ago

4 0

<em> </em>

<em> the quantity which can be measured is called </em>

<em> the quantity which can be measured is called quantity for example length and mass time temperature </em>

<em> the quantity which can be measured is called quantity for example length and mass time temperature please brainlist </em>

<em> the quantity which can be measured is called quantity for example length and mass time temperature please brainlist </em>

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As Aubrey watches this merry-go-round for a total of 2 minutes, she notices the black horse pass by 15 times. What is the period

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2 min = 120 sec

120/15 = 8

The black horse represents 8 seconds.

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2 years ago

A motor keep a Ferris wheel (with moment of inertia 6.97 × 107 kg · m2 ) rotating at 8.5 rev/hr. When the motor is turned off, t

Talja [164]

Answer:

$P = 133.13 Watt$

Explanation:

Initial angular speed of the ferris wheel is given as

$\omega_i = 2\pi f$

$\omega_i = 2\pi(8.5/3600)$

$\omega_i = 0.015 rad/s$

final angular speed after friction is given as

$\omega_f = 2\pi f$

$\omega_f = 2\pi(7.5/3600)$

$\omega_f = 0.013 rad/s$

now angular acceleration is given as

$\alpha = \frac{\omega_f - \omega_i}{\Delta t}$

$\alpha = \frac{0.015 - 0.013}{15}$

$\alpha = 1.27 \times 10^{-4} rad/s^2$

now torque due to friction on the wheel is given as

$\tau = I \alpha$

$\tau = (6.97 \times 10^7)(1.27 \times 10^{-4})$

$\tau = 8875.3 N m$

Now the power required to rotate it with initial given speed is

$P = \tau \omega$

$P = 8875.3 \times 0.015$

$P = 133.13 Watt$

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2 years ago