Recent content by 01010011

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Homework Statement A metre rule is balanced at the 50 cm mark. If a mass of 5kg is placed 40 cm from the pivot at one end, what mass must be placed 30 cm from the pivot on the other end to balance the rule? Homework Equations M1 * G * D1 = M2 * G * D2 The Attempt at a Solution...

Homework Statement Two balls roll towards each other. Ball A moves to the right with velocity 5 m/s and ball B moves to the left with velocity 3m/s. If both balls have the same mass, m=50kg, determine the final velocity of them if they move off together after collision. In which direction will...

Let me see... weight is acting vertically downwards, while force and displacement are acting horizontally. Therefore the weight had no influence on the force and displacement? Thanks very much, you made it clearer

Homework Statement A box of weight 100N is pushed a distance or displacement of 2m with a force of 40N. What is the work done on the box by i) the weight and ii) by the 40N force?Homework Equations Work = force * distance The Attempt at a Solution i) The work done on the box by weight = 0 (if...

I'm I on the right track here? Homework Statement Determine the resultant force and acceleration for a box of mass 15kg being pushed with a force of 9N and a force of friction 6N acting to oppose.Homework Equations Force = Mass * Acceleration The Attempt at a Solution Force = 9N Resultant...

Hi, Can you tell me if I am on the right track with this problem. Thanks in advance. Homework Statement Evaluate the integral using integration by parts Homework Equations ln(2x + 1)dx The Attempt at a Solution ln(2x + 1)dx = ln(2x + 1) * 1dx Let U = ln(2x + 1)...

Ok, I think I finally get it now, thanks

@Mark44, On second thought, I was looking at the following question in the book: Homework Statement Evaluate \int\stackrel{2}{1}\frac{dx}{(3-5x)^{2}} and they gave the answer as \frac{1}{14} My question is, isn't this the same situation where some number would make this also...

Ok, anytime I have a quotient like that, I'll check for this, thanks.

Yes this is the correct problem I have to work out. Ok, correct me if I am wrong but once there is a possibility of getting an undefined answer (because of the possibility of dividing by 0) then I can easily say that the difinite integral does not exist because it can't be defined if x = 1.5...

Hi, I'm I on the right track here? Homework Statement Evaluate the definite integral, if it exists Homework Equations \int^{2}_{0}\stackrel{dx/}{(2x-3)^2} The Attempt at a Solution Let u = 2x-3 du = 2dx 1/2du = dx 1/2\int^{2}_{0}\stackrel{du/}{u^2} going back to our...

Still trying to figure out what you mean by t = u^2. Up to where was I right?

Thanks for your reply Count Iblis. How does x come in this?

Hi, For this integration by substitution problem, I am not sure whether I should: 1. simplify the problem first, then select U, find the derivative of U, then integrate or 2. use the product rule first (on the upper part of the equation), then select U, then find the derivative of U...