# Recent content by parwana

1. ### Probability and Statistics, very basic stuff

Homework Statement Suppose that a dietitian has 3 groups of foods, having 5 items in the first group, 7 items in the second group and 2 items in the third group. 1. How many meals are possible containing one food from each food group? 2. How many meals are possible containing 3 foods from...
2. ### Spring and Oscillation

how do I set it up though .5kx^2= .5mv^2?
3. ### Spring and Oscillation

I checked the thread and it wasnt much of a help I tried to use conservation of momentum for this but it doesnt work
4. ### Spring and Oscillation

A 5.00 g bullet moving with an initial speed of v0 = 405 m/s is fired into and passes through a 1.00 kg block, as in Figure P13.58. The block, initially at rest on a frictionless horizontal surface, is connected to a spring with a spring constant of 950 N/m. Figure P13.58 (a) If the block...
5. ### Among Simple harmonic oscillation, simple pendulum and physical pendulum

can someone answer this please does the period have any m dependence in the simple pendulum? No right since its a masless rod. Also under what condition does the theoretical formula hold for the simple pendulum, would it be only for larger angles and amplitudes? Also there is a mass dependence...
6. ### Among Simple harmonic oscillation, simple pendulum and physical pendulum

thanks alot, also does the period have any m dependence in the simple pendulum? No right since its a masless rod. Also under what condition does the theoretical formula hold for the simple pendulum, would it be only for larger angles and amplitudes? Also there is a mass dependence in the...
7. ### Among Simple harmonic oscillation, simple pendulum and physical pendulum

What is the similarity between Simple Harmonic Oscillation(SHO), simple pendulum and a physical pendulum? I never understood it. Like whats the physical significance of SHO, or the energy and momentum change in oscillating motion?
8. ### Gases and Pressure

hmm I really dont know what I am doing wrong, this is so frustrating
9. ### Gases and Pressure

^ I have it written on top but if u want it again ((1.013X10^5 Pascals)(.004m^3))/20 Celsius= (((1.013X10^5 Pascals + 2X10^3N/m X height)/0.0100 meters^2)(.004m^3 + 0.0100meters^2 X height))/all over 230 Celsius
10. ### Gases and Pressure

^ I have it there in Celsius
11. ### Gases and Pressure

can someone help me and try it and see what I am doing wrong and the answer they get?
12. ### Thermal Concrete Physics

L= 270 change in L/270= 12 X 10^-6 (21)= 0.06804 270+0.06804= 270.06804 270/2= 135 270.06804/2= 135.03402 now according to u I should do pythagorean theorum, which I did and got 190.9 thats not right I got it though finally, when I do L/2, which is 270/2= 135, take the change in L, which is...
13. ### Thermal Concrete Physics

^ the height should be around 3.0, I am not getting that number
14. ### Thermal Concrete Physics

anyone care to help?
15. ### Gases and Pressure

I dont know whats wrong, its not getting the right answer