Calculating Speed of Lead Bullet on Steel Sheet

In summary, the conversation discusses the scenario of a lead bullet hitting a sheet of steel at 320K and completely melting due to the release of its kinetic energy. The specific heat capacity of lead and the specific latent heat of fusion are given to help calculate the speed at which the bullet hits the steel sheet. The suggested approach is to first calculate the energy needed to melt the bullet and then use that to determine the speed of the bullet.
  • #1
joyana32
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Homework Statement


A lead bullet at 320K is stopped by a sheet of steel so that it reaches its melting point of 600K and completely melts If 80% of the k.e of the bullet is converted into internal energy calculate the speed with which the bullet hits the stee sheet.


Homework Equations


Specific heat capacity of lead = 0.12kJ/kg K
Specific latent heat of fusion is 21kJ/kg


The Attempt at a Solution


i have just started this class so i am a newbie to all of this i tired EK=1/2mv^2 but I am having trouble with it
 
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  • #2


This doesn't belong in the Advanced Physics forum--the Introductory forum would be more appropriate.

Having said that, a good start would be to calculate how much energy it would take to melt the bullet. It doesn't tell you the bullet's mass, so just call it 'm' for now, and try to calculate the value in terms of that.
 

1. How is the speed of a lead bullet calculated on a steel sheet?

The speed of a lead bullet on a steel sheet can be calculated using the formula: speed = distance/time. The distance traveled by the bullet can be measured by the length of the bullet's path on the steel sheet. The time taken can be measured by the time it takes for the bullet to travel the distance on the steel sheet.

2. Do I need any specific equipment to calculate the speed of a lead bullet on a steel sheet?

Yes, you will need a measuring tool to measure the distance traveled by the bullet on the steel sheet, such as a ruler or measuring tape. You will also need a timer to measure the time taken by the bullet to travel the distance on the steel sheet.

3. How does the thickness of the steel sheet affect the speed of the bullet?

The thickness of the steel sheet can affect the speed of the bullet in two ways. Firstly, a thicker steel sheet will offer more resistance to the bullet, slowing it down and reducing its speed. Secondly, a thicker steel sheet will also result in a shorter distance traveled by the bullet, as it is more likely to get lodged in the sheet instead of passing through it.

4. Are there any safety precautions to consider when conducting this experiment?

Yes, it is important to wear appropriate safety gear, such as gloves and safety glasses, when handling bullets and using equipment for this experiment. Make sure to conduct the experiment in a controlled environment with proper ventilation. It is also recommended to have an experienced supervisor present during the experiment.

5. How can the speed of the bullet on the steel sheet be used in real-world applications?

The speed of a bullet on a steel sheet can be used to determine the impact force of the bullet on the target. This information can be useful in forensic investigations, ballistics testing, and designing bulletproof materials. It can also help in understanding the effects of different velocities on the bullet's performance and accuracy.

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