Recent content by jiayingsim123

Hi there! Intensity just means the number of photons contained in the light beam. So the higher the intensity, the more photons are contained. I know clearly that if frequency is kept constant, an increase in intensity will increase the photoelectric current because current is the rate of flow...

Homework Statement Radiation of wavelength 240nm gives rise to a maximum photoelectric current, I. The intensity of the incident radiation is maintained constant and the wavelength is now reduced. State and explain the effect of this change on (i) The maximum kinetic energy of the...

Homework Statement A gas cylinder contains 4.00 × 10^4cm^3 of hydrogen at a pressure of 2.50 × 10^7Pa and a temperature of 290K. The cylinder is to be used to fill balloons. Each balloon, when filled, contains 7.24 × 10^3cm^3 of hydrogen at a pressure of 1.85 × 10^5Pa and a temperature of...

Hi I'm so sorry, yes I do mean at A. What do you mean by that last statement? Doesn't the frictional force act perpendicularly to the line connecting O to C?

Hi there, thanks for replying. So what you're trying to say is that at B, there is frictional force acting both downwards and upwards (upwards on the rod to prevent it from sliding down and downwards on the sphere presumably?). And there is a reaction force acting on the rod because the rod is...

Homework Statement A uniform sphere rests on a horizontal plane. The sphere has centre O, radius 0.6m and weight 36N. A uniform rod AB, of weight 14N and length 1 m, rests with A in contact with the plane and B in contact with the sphere at the end of a horizontal diameter. The point of...

Homework Statement A uniform ladder AC weight 400N & length 3.5 m is held horizontally by 2 people. One person supports at A and the other at B, a distance 1m away from C. 1. Calculate the supporting force provided by the person at A. (I managed to do this one and the answer is 120N) 2. The...

Homework Statement A particle A, of mass 3kg, is connected by light, inextensible strings to particles B and C, of masses 5kg and 1kg respectively. They lie at rest on a smooth horizontal plane, with the strings just taut and angle BAC=theta. A then receives and impulse directed away from B...

I am trying to find the three roots from x=0 to x=2∏ for this equation: x*Sin[x] + 1.5 x - 3. I want to divide the graph into intervals of say from x=1.0 to x=2.0 as one interval and so on and so forth. How do I go about inserting that code into my existing codes? I am using the bisection method...

Hi there tiny-tim, But I thought the distance between the two particles will increase? From a to 2a? Distance a is the initial distance (which is when the string is still not taut) and distance 2a is the final distance (which is when the string is already taut and impulse is already created...

http://img571.imageshack.us/img571/5838/img1246xk.jpg Hi there tiny-tim, here is my illustration of how I interpreted the question. I find it a tad strange that both the particles have different final speeds, I'm given the knowledge that if the string is already taut, both particles will...

Okay thanks for clearing that up, tiny-tim! You're really awesome! :)

Homework Statement Particles A and B, each of mass m, are connected together by means of a light, inextensible string of length 2a. They are at rest a distance, a apart on a smooth horizontal plane. A is then projected with speed u along the plane at right angles to AB. Find the velocities of...

Hi tiny-tim, thanks for helping out again! But I thought the mass m drops onto the scale pan, meaning both of it will move downwards as a single entity and therefore the total mass is 2m? So isn't it a mass of 2m colliding with a stationary mass of 3m?

Thanks so much tiny-tim, you've been so kind! :) I posted another question on impulsive tension, just can't seem to grasp the topic well! :(