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V125BC [204]
3 years ago
14

A uniform rod of mass M and length L is free to swing back and forth by pivoting a distance x from its center. It undergoes harm

onic oscillations by swinging back and forth under the influence of gravity. Randomized Variables M=2.2 kg x= 0.49 m 33% Part (a) In terms of M, L, and x, what is the rod' s moment of inertia / about the pivot point?
Physics
1 answer:
Alisiya [41]3 years ago
5 0

Answer:

The moment of inertia is 0.7500 kg-m².

Explanation:

Given that,

Mass = 2.2 kg

Distance = 0.49 m

If the length is 1.1 m

We need to calculate the moment of inertia

Using formula of moment of inertia

I=\dfrac{1}{12}ml^2+mx^2

Where, m = mass of rod

l = length of rod

x = distance from its center

Put the value into the formula

I=\dfrac{1}{12}\times2.2\times(1.1)^2+2.2\times(0.49)^2

I=0.7500\ kg-m^2

Hence, The moment of inertia is 0.7500 kg-m².

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The charge entering the positive terminal of an element is q = 5 sin 4πt mC while the voltage across the element (plus to minus)
Artemon [7]

Answer:

(a). The power delivered to the element is 187.68 mW

(b). The energy delivered to the element is 57.52 mJ.

Explanation:

Given that,

Charge q=5\sin4\pi t\ mC

Voltage v=3\cos4\pi t\ V

Time t = 0.3 sec

We need to calculate the current

Using formula of current

i(t)=\dfrac{dq}{dt}

Put the value of charge

i(t)=\dfrac{d}{dt}(5\sin4\pi t)

i(t)=5\times4\pi\cos4\pi t

i(t)=20\pi\cos4\pi t

(a).We need to calculate the power delivered to the element

Using formula of power

p(t)=v(t)\times i(t)

Put the value into the formula

p(t)=3\cos4\pi t\times20\pi\cos4\pi t

p(t)=60\pi\times10^{-3}\cos^2(4\pi t)

p(t)=60\pi\times10^{-3}(\dfrac{1+\cos8\pi t}{2})

Put the value of t

p(t)=60\pi\times10^{-3}(\dfrac{1+\cos8\pi\times0.3}{2})

p(t)=30\pi\times10^{-3}(1+\cos8\pi \times0.3)

p(t)=187.68\ mW

(b). We need to calculate the energy delivered to the element between 0 and 0.6 s

Using formula of energy

E(t)=\int_{0}^{t}{p(t)dt}

Put the value into the formula

E(t)=\int_{0}^{0.6}{30\pi\times10^{-3}(1+\cos8\pi \times t)}

E(t)=30\pi\times10^{-3}\int_{0}^{0.6}{1+\cos8\pi \times t}

E(t)=30\pi\times10^{-3}(t+\dfrac{\sin8\pi t}{8\pi})_{0}^{0.6}

E(t)=30\pi\times10^{-3}(0.6+\dfrac{\sin8\pi\times0.6}{8\pi}-0-0)

E(t)=57.52\ mJ

Hence, (a). The power delivered to the element is 187.68 mW

(b). The energy delivered to the element is 57.52 mJ.

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II Force on a tennis ball. The record speed for a tennis ball that is served is 73.14 m/s. During a serve, the ball typically st
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Answer:

F=248.5W N

Explanation:

Newton's 2nd Law tells us that F=ma. We will use their averages always. The average acceleration the tennis ball experimented is, by definition:

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