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3 years ago

5

g A CD is spinning on a CD player. You open the CD player to change out the disk and notice that the CD comes to rest after 15 r

evolutions with a constant deceleration of 120 r a d s 2 . What was the initial angular speed of the CD

1 answer:

Umnica [9.8K]3 years ago

7 0

Answer:

$\omega_1=150rads/sec$

Explanation:

From the question we are told that:

Number of Revolution $N=15=30\pi$

Deceleration $d= -120 rads/2$

Generally the equation for initial angular speed $\omega_1$ is mathematically given by

$\omega_2^2=\omega_1^2 +2(d)(N)$

$0=\omega_1^2 +2(-120)(20 \pi)$

$\omega_1^2=7200 \pi$

$\omega_1=150rads/sec$

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3 years ago

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Tamiku [17]

<em>F</em> = 153 N

$\theta = 11.3°$

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Let us define first our directional convention. Anything pointing up or to the right is considered positive and anything pointing down or to the left is considered negative. Now let's look at the components $F_{x}$ and $F_{y}$ :

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3 years ago

Which objects will likely have the greatest gravitational force between them?

Mariulka [41]

Answer:

d. Two soccer balls that are touching each other

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As the mass of a soccer ball is more than the mass of a tennis ball, so

$m_2 > m_1$

Let $d_1$ be the distance between the centers of both the balls near each other and $d_2$ be the distance between the centers of both the balls touching each other.

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The gravitational force, F, between the two objects having masses M and m and separated by distance d is

$F=\frac{GMm}{d^2}$

Where G is the universal gravitational constant.

As, the gravitational force is directly proportional to the product of both the masses and inversely proportional to the square of the distance between them, so selecting the larger mass ( $m_2$ , soccer ball) separated by a lesser distance ( $d_2$ , touching) to get more gravitational force.

Therefore, there will be a larger gravitational force between them when two soccer balls touching each other.

Hence, option (d) is correct.

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