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During July 1994 the comet Shoemaker-Levy 9 smashed into Jupiter in a spectacular fashion. The comet actually consisted of 21 distinct pieces, the largest of which had a mass of approximately \(4.0 \times 10^{12} \mathrm{~kg}\) and a speed of \(6.0 \times 10^{4} \mathrm{~m} / \mathrm{s}\). Jupiter, the largest planet in the solar system, has a mass of \(1.9 \times 10^{27} \mathrm{~kg}\) and an orbital speed of \(1.3 \times 10^{4} \mathrm{~m} / \mathrm{s} .\) If this piece of the comet had hit Jupiter head-on, what would have been the change (magnitude only) in Jupiter's orbital speed (not its final speed)?

Short Answer

Expert verified
The change in Jupiter's orbital speed is approximately 0 m/s.

Step by step solution

01

Understanding the Collision

We are looking at an inelastic collision where a comet fragment collides head-on with Jupiter. In such collisions, the linear momentum is conserved.
02

Setting up the Equation for Momentum Conservation

The conservation of momentum for the system, before and after the collision, is given by:\[ m_c v_{ci} + m_j v_{ji} = (m_c + m_j) v_{jf} \]where:- \( m_c \) is the mass of the comet, \( 4.0 \times 10^{12} \text{ kg} \)- \( v_{ci} \) is the initial speed of the comet, \( -6.0 \times 10^4 \text{ m/s} \) (negative because it's head-on)- \( m_j \) is the mass of Jupiter, \( 1.9 \times 10^{27} \text{ kg} \)- \( v_{ji} \) is the initial speed of Jupiter, \( 1.3 \times 10^4 \text{ m/s} \)- \( v_{jf} \) is the final speed of Jupiter.
03

Simplifying the Equation

Rearrange the momentum equation to solve for \( v_{jf} \), the final velocity of Jupiter after the collision:\[ v_{jf} = \frac{m_c v_{ci} + m_j v_{ji}}{m_c + m_j} \]
04

Calculating Initial Momentum Terms

Compute \( m_c v_{ci} \):\[ m_c v_{ci} = 4.0 \times 10^{12} \text{ kg} \times (-6.0 \times 10^4 \text{ m/s}) = -2.4 \times 10^{17} \text{ kg m/s} \]Calculate \( m_j v_{ji} \):\[ m_j v_{ji} = 1.9 \times 10^{27} \text{ kg} \times 1.3 \times 10^4 \text{ m/s} = 2.47 \times 10^{31} \text{ kg m/s} \]
05

Substitute and Solve for Final Velocity

Substitute the momentum terms into the equation:\[ v_{jf} = \frac{-2.4 \times 10^{17} + 2.47 \times 10^{31}}{4.0 \times 10^{12} + 1.9 \times 10^{27}} \]Simplifying:\[ v_{jf} \approx \frac{2.47 \times 10^{31}}{1.9 \times 10^{27}} \approx 1.3 \times 10^4 \, \text{m/s} \]
06

Calculate Change in Jupiter's Orbital Speed

Compute the change in speed:\[ \Delta v = |v_{jf} - v_{ji}| \]Since \(v_{jf} \approx 1.3 \times 10^4\, \text{m/s}\), the change is insignificant at this scale:\[ \Delta v \approx 0 \text{ m/s} \]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Conservation of Momentum
In physics, the principle of conservation of momentum is fundamental, especially when analyzing collisions. Momentum, defined as the product of an object's mass and velocity, remains constant in a closed system where no external forces act. This means that the total momentum before a collision is equal to the total momentum after it.

In the case of the comet Shoemaker-Levy 9 colliding with Jupiter, this concept is crucial. The system, consisting of the comet and Jupiter, conserves momentum throughout the impact. It's essentially a large-scale demonstration of how momentum conservation works in nature. By applying the equation \[ m_c v_{ci} + m_j v_{ji} = (m_c + m_j) v_{jf} \]we calculate the change in velocities post-collision, maintaining the total momentum of the system. This principle helps us predict outcomes when celestial bodies interact in space, like this dramatic event.
Comet Impact
A comet impact is a striking event in the cosmos, and the Shoemaker-Levy 9 collision with Jupiter was one of the most significant examples witnessed. When the comet, made up of 21 pieces, hit Jupiter, it was traveling at an astonishing velocity of \(6.0 \times 10^4 \text{ m/s}\).

This high-speed impact meant that the comet's kinetic energy was transferred to Jupiter, although its massive size made the change in its own motion negligible. The principles governing such impacts include energy transfer and momentum conservation, providing insights into the aftermath of the collision, like shock waves and potentially changes in orbits.

Understanding comet impacts on planets offers critical data on planetary defense and how these events can affect planetary atmospheres and surfaces. This collision with Jupiter did not only offer a chance to study theoretical physics but also real-world applications of these principles on a grand scale.
Jupiter's Orbital Speed
Jupiter's orbital speed is a measure of its velocity as it travels along its path around the Sun, \(1.3 \times 10^4 \text{ m/s}\).This speed is determined by the gravitational forces acting on Jupiter, primarily from the Sun, and is necessary for maintaining its elliptical orbit.

The impact of the comet on Jupiter provided an opportunity to observe any potential changes in this speed. However, due to Jupiter's massive size compared to the comet, the change was negligible. The formula applied in the conservation of momentum problem of the Shoemaker-Levy 9 comet impact correctly predicted this outcome, reinforcing the stability of Jupiter's motion in its giant orbit.

Such calculations are foundational in understanding planetary dynamics and motion within our solar system, offering deeper insights into celestial mechanics and how minor perturbations like comet impacts might affect planetary trajectories.
Physics Problem Solving
Physics problem solving often involves applying fundamental principles to real-world scenarios, like the comet impact. This process begins with identifying relevant concepts, such as momentum conservation, and setting up applicable equations.

In the Shoemaker-Levy 9 problem, physicists outlined the momentum equation to model the scenario. Breaking down the problem step by step allowed them to isolate variables and solve for changes in Jupiter's speed.

Key techniques include:
  • Identifying known quantities such as masses and velocities.
  • Using fundamental equations like the conservation of momentum.
  • Simplifying complex equations for clarity and calculation.
These steps are typical in physics problem-solving, highlighting the systematic approach to understanding and predicting physical interactions in the universe, thereby transforming intriguing celestial events, like the comet collision, into comprehensible phenomena.

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Most popular questions from this chapter

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