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charle [14.2K]
3 years ago
10

an object starts at rest and accelerates until it is moving at 247 km/h. if it takes 1.7minutes for this change to occur what is

the average acceleration in m/s
Physics
1 answer:
d1i1m1o1n [39]3 years ago
5 0

The average acceleration in 0.67 m/s^2.

The average acceleration is calculated as change in velocity/time

a=(247*5/18)/(1.7*60)

=68.61/102=0.67 m/s^2

Therefor the average acceleration of the object is 0.67 m/s^2

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Answer:

c. Sound travels slower than light.

Explanation:

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A uniform disk of mass 3.25 kg has a radius of 0.100 m and spins with a frequency of 0.550 rev/s. What is its angular momentum?
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L=I\cdot\omega

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Angular momentum is mass time the square of the radius of the object. Moment of inertia for a uniform disk is given as,

I=\frac{1}{2}m\cdot r^2

Here, m is the mass of the disk and r is the radius of the disk.

Replacing:

L=\frac{1}{2}m\cdot r^2\cdot\omega

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We replace each data to calculate the angular momentum:

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Answer:

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I attached an image of the forces diagram below.

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\Sigma F_y=T_1sin\theta+T_2sin\theta-W=0\\\\T_1=T_2=T\\\\\Sigma F_y=2Tsin\theta=W\\\\T=\frac{W}{2sin\theta}

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