Recent content by lemon

Hi: Would somebody kindly check I have approached this problem correctly, please? Thank you. Homework Statement A 0.2kg mass is suspended from a light spring, producing an extension of 5.0cm. a) Calculate the force constant of the spring. The mass is now pulled down a further 2.0cm and...

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Hi: Would somebody please check to see if I am on the right track with this problem. Many thanks Homework Statement An 80kg man on a step-exercise machine climbs a staircase 3.0m high in 8.5s. If he works at the same rate to drive a pedal-operated generator with an efficiency of 75%, how...

Please continue. However, your argument among yourselves about 'how' I should consider this problem is taking up more valuable revision time than I can afford, with exams quickly approaching. While I do appreciate all offers of assistance, I am best to take advise about 'how' to solve this...

Please guys/girls - take it to another thread or argue it privately. This thread is closed. Thank you.

Hmm! Who'd have thought this question would have sparked such a fiery joust. I am studying a pre-university foundation course and feel that there is enough information in these posts for me to take and use correctly. I shall use my own judgement on this part. The purpose of this study is...

There are only 2 forces acting on the ball The centripetal force of Tension acting toward the centre and the weight acting downward. I just read that the tension provides component forces to balance the weight of the mass and provide centripetal force. It said 'forces'. So do I need to break...

Homework Statement A mass of 0.30kg is attached to one end of a string of length 0.50m is whirled in a horizontal circle with gradually increasing speed. a) Determine the maximum linear speed reached if the string breaks when the tension reaches a value of 25N. b) What is the...

Thanks Doc

ahh of course: silly boy! (1/2x0.7x4.0^2) + (1/2x0.8x3.5^2) = 10.5 J

Hi - Would someone check my method here please? Thank you Homework Statement Two trolleys A and B, of mass 0.70kg and 0.80kg respectively, are on a horizontal track and held together by a compressed spring. When the spring is released the trolleys separate freely and A moves to the left...

Homework Statement A wire of diameter 5.0 mm supports a 2.8kg load. (a) Determine the tension in the wire (b) The original length of the wire was 2.0m Calculate its extension when supporting the load. Homework Equations Young's modulus for the material of the wire = 2.0 x 10^7N...

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Homework Statement \[ \[ \begin{array}{l} {\rm{A quantity Y is given by:}} \\ Y = \frac{{4a^3 b}}{{\left( {5c^2 \sqrt {\rm{d}} } \right)}} \\ {\rm{Find the error in Y given the following errors in a, b, c, and d:}} \\ a \pm 1\% ,{\rm{ }}b \pm 0.5\% ,{\rm{ }}c \pm 2\% ,\,{\rm{ }}d \pm...

cool.. Thank you