Physics for Scientists and Engineers, Vol. 1
Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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Question
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Chapter 8, Problem 71P

(a)

To determine

The direction of impact with the meteorite.

(a)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The meteorites are rock-like shapes that move in the space together with earth and the other planets. These meteorites are large in shapes, have a rigid structure that does not follow any desired path. This meteorite is a solid shaped body that originated from a comet or an asteroid.

The striking of the meteorites with the earth is exactly in the opposite direction to the orbital velocity with which the earth is travelling.

Conclusion:

The direction of striking meteorite is exactly opposite to the direction of the orbital velocity of the earth.

(b)

To determine

The maximum percentage change in earth’s orbital speed as a result of collision.

(b)

Expert Solution
Check Mark

Answer to Problem 71P

The maximum percentage change in earth’s orbital speed as a result of collision is 2.71×1015% .

Explanation of Solution

Given:

The mass of the meteorite is mm=2.72×105tonnes .

The speed of the meteorite is vm=17.9km/s .

The earth’s orbital speed is about ve=30km/s .

Formula used:

The expression for conservation of momentum is given as,

  ΔP=PfPi

Here, Pf is the final momentum of the body and Pi is the initial momentum of the body.

The expression for the momentum is given as,

  P=m×v

The expression for the percentage change in earth’s orbital speed is given as,

  |Δvve|=|vevfve|

Here, vf is the final velocity of the system after collision.

Calculation:

Applying the linear conservation of momentum into the system as,

  ΔP=0PfPi=0

As after the collision the meteorite and earth moves horizontally. Therefore,

  Pf,xPi,x=0(me+mm)vf(mevemmvm)=0vf=( m e v e m m v m )( m e + m m )=meve( m e + m m )mmvm( m e + m m )

On further solving as,

  vf=ve(1+ m m m e )mmmevm(1+ m m m e )

Since the mass of earth is very large as compared to the mass of the meteorite.

  mm<<me

Therefore, The term mmme is neglected.

Thus, the final velocity is expressed as,

  vf=ve m m m e vm( 1+ m m m e )=ve( m m m e vm)(1+ m m m e )1=ve( m m m e vm)(1 m m m e )=ve( m m m e vm)

The expression for the percentage change in earth’s orbital speed is given as,

  |Δv v e|=| v e v f v e|=|1 v f v e|

The percentage can be calculated as,

  |Δv v e|=|1 v f v e|=|1 v e( m m m e v m ) v e|=|( m m m e v m ) v e|=|( 2.72× 10 5 tonne( 10 3 kg tonne ) 5.98× 10 24 kg ×( 17.9 km/s ))30 km/s|

On further solving as,

  |Δv v e|=2.71×1017=2.71×1015%

Conclusion:

Therefore, the maximum percentage change in earth’s orbital speed as a result of collision is 2.71×1015% .

(c)

To determine

The mass of an asteroid to change the earth’s orbital speed by 1% .

(c)

Expert Solution
Check Mark

Answer to Problem 71P

The mass of an asteroid to change the earth’s orbital speed by 1% is 1×1023kg .

Explanation of Solution

Given:

The weight of the meteorite is mm=2.72×105tonnes .

The speed of the meteorite is vm=17.9km/s .

The earth’s orbital speed is about ve=30km/s .

The percentage change in the earth’s orbital speed is |Δvve|=1% .

Formula used:

The expression for percentage change in earth’s orbital speed is given as,

  |Δvve|=|( m m m e v m)ve|

Calculation:

The mass of the meteorite can be calculated as,

  |Δv v e|=|( m m m e v m ) v e|1100=( m m m e v m )vemm=veme100×vm=30km/s×( 5.98× 10 24 kg)100×( 17.9 km/s )

On further solving as,

  mm=1×1023kg

Conclusion:

Therefore,the mass of an asteroid to change the earth’s orbital speed by 1% is 1×1023kg .

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Chapter 8 Solutions

Physics for Scientists and Engineers, Vol. 1

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