# Fishing Line Physics: Finding Time and Velocity

• moondawg
In summary, the question involves finding the time it takes for a fishing line, cast at 27 m/s at an angle of 33 degrees above the horizontal from a 15m tall bridge, to hit the water below and its velocity at impact. Using the equations x=xo+vot+1/2at^2 and v=vo+at, the time is found to be 3.74 seconds and the velocity is found to be 22.69 m/s. The use of two parts to find the time is not necessary as projectiles are only affected by the force of gravity.
moondawg
1. A fishing line is cast at 27 m/s at an angle of 33 degrees above the horizontal from the top of a 15m tall bridge. Find the time until the line hits the water below and find its velocity when it hits.

x=xo+vot+1/2at2
v=vo+at

## The Attempt at a Solution

I first found my component velocities and then the time by using the x=... equation above. I broke it up into 2 parts: the time it took to leave the bridge to the time it was level with the bridge on its downfall and i got 2.94s. Then i found the time it took to go from the point level with the bridge to the water and got .8s. I then added 2.94+.8=3.74s*.
To find the velocity i plugged my numbers into v=... equation above and got 22.69m/s*.

Someone please check and see if I did this correctly! I'm not sure if I was supposed to break it into 2 parts to find the time!

A tip, when you preview the first post it puts the template in again, it helps to edit that out.

As for breaking it into two parts...my high school teacher described it as the tricycle method. There's a simpler way to do this.

However, why does your X component have acceleration in it? Remember projectiles are only affected by the force of gravity.

## 1. What is the relationship between fishing line length and time?

The length of the fishing line determines the amount of time it will take for the line to reach the desired velocity. The longer the line, the longer it will take for the line to reach its target velocity.

## 2. How does the weight of the fishing lure affect the velocity of the line?

The weight of the lure affects the velocity of the line by increasing the amount of force needed to pull the line through the water. This results in a slower velocity for the line.

## 3. Can you calculate the velocity of the fishing line based on its length and weight?

Yes, the velocity of the fishing line can be calculated using the equation: velocity = length/weight. However, this equation is only an estimate and may not account for other factors such as friction and resistance in the water.

## 4. How does the thickness of the fishing line impact its velocity?

The thickness of the fishing line affects its velocity by increasing the surface area and creating more resistance in the water. Thicker lines will have a slower velocity compared to thinner lines.

## 5. Is there a way to increase the velocity of the fishing line?

Yes, there are a few ways to increase the velocity of the fishing line. One way is to use a thinner and lighter fishing line, as this will reduce resistance in the water. Another way is to use a more aerodynamic lure, which will also reduce resistance and increase the velocity of the line.

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