A single star in the process of forming starts by spinning slowly (while it is quite large and relatively cool.) As the star collapses under the pull of its own gravity, its size decreases. As a result, its rate of spinning:_____.

Answers

Answer 1

Answer:

Answer:

Explanation:

According to the conservation of momentum, when the external torque is not applied on the system, then the angular momentum of the system is conserved.

I x ω = constant

$I_(1)\omega _(1)=I_(2)\omega _(2)$

where, I is the moment if inertia and ω is the angular velocity

As the star is collapsed, the radius decreases and hence the moment of inertia also decreases.

According to the law, the angular velocity increases, thus the rate of spinning increases.

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Two waves are superposed. One wave has an amplitude of 3 cm, and the other has an amplitude of 4 cm. What is the resultant amplitude?

Answers

The sum (or difference) of two solutions of the wave equation is again a solution of the wave equation(superposition principle)

therefore the amplitude of resultant wave is 3+4= 7cm

Answer:

7 cm

Explanation:

When the waves are super-posed their amplitudes are added algebraically to get the resultant amplitude.

resultant amplitude = 3+4 = 7cm

What is the difference between binary fission and multiple fission??

Answers

During binary fission mitosis occcure so resultant individuals are identical to parents and to each other. It is asexual reproduction. The nucleus of the unicellular parent organism divides into two.
During multiple fussion amitosis occure so there are many divisions of nucleus of unicellular parent organism.

The apparent change of frequency of a source of sound due to it me relative motion between the sound and a listener is called the

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That's the "Doppler effect". It's also the operating principle
behind police speed radar.

When an object is translated, its image is the same size as the pre-image.a. True
b. False

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This is true. Unlike the answer above, I disagree. A translation is simply sliding the shape across a graph. It doesn't change the size, shape, or orientation- the coordinates are the only thing that change. A dilation changes the size of a shape, not a translation.

False, Because there is some cases where enlarged image needed.

A 1.0 kg book is lifted 0.5 m above the table , but the table is 1.0 m above the floor , what would be the P.E of the book if the reference level where the floor ?

Answers

The height of the book from the ground = 1.0 m + 0.5 m = 1.5 m

The mass of the book = 1 kg

We know that =

$P.E.=m*g*h$

Taking 'g' as 9.8 m/s² and putting the values in the formula we get -

$P.E.=1*9.8*1.5$

$P.E.=14.7$ $Joules$

A car with a mass of 1500 kg is traveling at a speed of 30 m/s. Calculate its kinetic energy.step by step pls

Answers

Explanation:

KE = 1/2 mv²,

where KE is the kinetic energy,

m is the mass,

and v is the velocity.

Given m = 1500 kg and v = 30 m/s:

KE = 1/2 (1500 kg) (30 m/s)²

KE = 675,000 J

KE = 675 kJ

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