# Search results

1. ### The second derivative

Where did you get this formula from? How did you wind up to this product rule? I got u'(x) = (2/3) x^(-1/3) u''(x) = (-2/9) x^(-4/3) v'(x) = -(1/3) < (6-x)^(-2/3) > v''(x) = -(2/9) < (6-x)^(-5/3) > using your formula it's difficult to simplify after this step < (-2/9) (x^(-4/3))...
2. ### The second derivative

Homework Statement Find the second derivative of the function: f(x)= x^(2/3) (6-x)^(1/3) Homework Equations The chain, product and quotient rules The Attempt at a Solution I have found the first derivative and checked my solution: ′()= 4− / ^(1/3) (6−)^(2/3) The final...
3. ### The second derivative

How do I find the second derivative of the function: f(x)= x^(2/3) (6-x)^(1/3) I have found the first derivative and checked my solution: ′()= 4− / ^(1/3) (6−)^(2/3) The final solution is supposed to be: ''()= -8 / ^(4/3) (6−)^(5/3) I know almost all the steps but I couldn't...
4. ### Fluid Mechanics, Drag Coefficient of a Cylinder

Homework Statement Calculate the pressure drag cofficient for a cylinder using the trapezoidal and simpson's rule (assume the flow is the same on both sides of the cylinder). Angle (deg) Cp 0 1 30 0.274 60 -1.565 90...
5. ### Fluids Engineering Question!

Homework Statement Use Buckingham's Pi Theorem to describe waves amplitude. The Attempt at a Solution Waves amplitude depends on: Geometric variables: L,A Kinematic variables: g,c (c = waves speed) Dynamic variables: roh (density), sigma (surface tension) Using MLT: L = L, A =...
6. ### Soil Mechanics Question

Homework Statement A horizontal layer of soil in a tube 100 x 100 mm in cross-section. water is supplied to maintain a constant head difference of 300 mm across the sample. the coefficient of permeability of the soils in the direction of flow through them are as follows: Soil A = 10^-2...
7. ### Heat Transfer Question

So for the first question, do I ignore what it says about radiation & convection? For the second it's a flat plate... I've just asked my instructor via e-mail & he said that Reynold's number has to be above 10^5 to expect turbulet flow. I appreciate your help, thank you!
8. ### Heat Transfer Question

The equation comes from Fourir's law for convection. K is the thermal conductivity (kW/mK) r2 is the outer radius (m) & r1 is the inner radius (m)... Sorry for the typing mistake: Q = 2 Pai K L (T1 - T2) / ln (r2 / r1) The second equation is Reynold's Number.
9. ### Vibration Question

Thank you so much! :)
10. ### Dynamics Question

Homework Statement :[/B] Rod BP (20 degrees from horizontal) attached at slider P on rod AD (60 degrees from horizontal), distance between 2 rods = 300 mm, wA = 10 rad/s (I) Find angular velocity of rod attached at B (II) Find relative velocity of slider P with respect to the rod on which...
11. ### Vibration Question

Homework Statement :[/B] BoB released from rest, L = 102 cm, theta = +-5 degrees, g = 9.81 m/s2 assume a SHM (I) Determine the angle theta after 1.6 s (II) Determine the magnitudes of velocity & acceleration of the BoB at 1.6 s Homework Equations theta = A sin (w t + phai) The...
12. ### Heat Transfer Question

1. The problem statement: (a)Concider a stainless steel hollow pipe containing a saturated steam and has length L, cooled by convection & radiation. Find formula for T2. (b) Another question "Not related to the previous one": How would I know if a gas has gone turbulent? Homework...
13. ### Vibration Question

1. Homework Statement : BoB released from rest, L = 102 cm, theta = +-5 degrees, g = 9.81 m/s2 assume a SHM (I) Determine the angle theta after 1.6 s (II) Determine the magnitudes of velocity & acceleration of the BoB at 1.6 s Homework Equations theta = A sin (w t + phai) The...
14. ### Dynamics Question # 2

1. Homework Statement : Rod BP (20 degrees from horizontal) attached at slider P on rod AD (60 degrees from horizontal), distance between 2 rods = 300 mm, wA = 10 rad/s (I) Find angular velocity of rod attached at B (II) Find relative velocity of slider P with respect to the rod on which ot...
15. ### Heat Transfer Question

1. The problem statement: (a)Concider a stainless steel hollow pipe containing a saturated steam and has length L, cooled by convection & radiation. Find formula for T2. (b) Another question "Not related to the previous one": How would I know if a gas has gone turbulent? 2. Homework...
16. ### Dynamics Question

KE = 1/2 I w2? Do I get the distance b (the distance from point C to the center G of the rod) using PE? And thank you for the hint...
17. ### Dynamics Question

1. The problem statement Hey everyone, I'm a new member here... I'd be grateful if you attempt to solve my following question: A slender rod of length l is pivoted about a point C located at a distance b from its center G. It's released from rest in a horizontal position and swings freely...