The problem involves a 17 g bullet being accelerated in a rifle barrel that is 103 cm long, reaching a speed of 392 m/s. Participants are tasked with using the work-energy theorem to find the average force exerted on the bullet during its acceleration.
The discussion is ongoing, with participants exploring the application of the work-energy theorem and clarifying the relationship between work, force, and distance. Some guidance has been provided regarding the initial and final velocities, as well as the definition of work.
Participants express confusion about which values to use in their calculations and the definitions involved in the work-energy theorem. There is an emphasis on understanding the concepts rather than moving directly to calculations.
Why not start with the work-energy theorem?xlogit3k said:No idea how to start this problem
collinsmark said:Why not start with the work-energy theorem?
Well, you know the initial velocity is 0 and the final velocity is 392 m/s.xlogit3k said:Wnet= 1/2mv^2(final)-1/2mv^2(initial)
i don't know what numbers to put in
collinsmark said:Well, you know the initial velocity is 0 and the final velocity is 392 m/s.
But there is also something else you'll need. What is the very definition of work? (Hint: it's a function of force and displacement).
That's right! (Well, technically it's the dot product of force and displacement). Now you should have enough to solve the problem.xlogit3k said:force x distance