A pyrotechnical expert needs to fire a 15 kg projectile from a launching device that has a barrel length of 2 meters. The projectile will need to be launched horizontally 1 km in 5 seconds. Calculate the force needed to launch the projectile.

The force needed to launch the projectile is 150000 N.

Explanation:  

We can find the force using the following equation:

Where:

m: is the mass = 15 kg

a: is the acceleration

First, we need to find the acceleration of the projectile:

Where:

: is the final speed

: is the initial speed = 0

x: is the distance = 2 m

The final speed is:

Then, the acceleration is:

Finally, the force is:

Therefore, the force needed to launch the projectile is 150000 N.

I hope it helps you!  

answer: what are you talking about?

explanation:

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.