HW2.1

Homework 2 Problem 1

=Part A=

//Main Focus: The main point of this problem is to make you learn how to use Reynold's formula for momentum in an unsteady situation.//

Use the Reynolds formula that solves for the sum of forces. Note that this problem is unsteady since the velocity is a function of time. Adding a coordinate system can help solve this problem.

∑Fx = d/dt∫∫p(Vo-kt)•da•dx +∫p(Vo-kt)^2•da

Answer: F=pA[(Vo-kt)^2-lk]

=Part B=

//Main Focus: Can you plug numbers in correctly.//

Note: The Vo-kt, term is the instantaneous velocity. Therefore you need to plug in 6m/s for that in the formula.

Answer: F= +405 N