Recent content by hemetite

Newton's first law & 2nd law

Homework Statement A line of wavelength 1093 nm is observed in the hydrogen spectrum. Identify the transition that leads to this line. Homework Equations where n refers to the upper state and n' to the lower state. 1/lamda = R (1/n' - 1/n) -----1 Ei - Ef = hc/lamda ------2...

Homework Statement An aluminium sleeve of internal diameter 4.000cm at 10 degrees Celsius is heated and slipped over a steel rod of diameter 4.040cm (at 10 degrees Celsius. When the aluminium sleeve and steel rod return to room temp they are impossible to separate. Assume that the...

thanks..here is my attempt... from answer of first part q=8.22 x 10^-3.. there at drop the number of electrons lost = (8.22 x 10 ^ -3) / (1.6021765 x 10 ^ -19) = 5.13 x 10 ^ 16 i have strong feeling that this is the answer...since when it is falling...the charge of the drop is strong enough...

Homework Statement A charged water droplet of radius 0.02 mm remains stationary in air. If the electric field of the Earth is 100 N/C downward,what is the charge on the water droplet? By comparison with its neutral state, how many electrons must the water droplet have gained or lost? [...

coincidentally i am doing this question too... so i got the angle as... tan teta = V^2/ R therefore the angle = 26.69 degrees for it to be stable again. the frictional force = centripetal force... the centripetal force => F(Normal) x sin0 = m(v^2/r) how to find the fricitonal...

Homework Statement A bicyclist of mass 65kg (including the bicycle) can coast down a 6 degree hill at steady speed of 6km/h because of air resistance. How much force must be applied to climb the hill at the same speed and same air resistance? The Attempt at a Solution since it is at...

here what i get... these are the formulas... for fundamental frequency...n=1 so, f= V/2L --------- 1 lamba = 2L ------- 2 v= lambda * f -----3 v= sqrt (T/ (m/L) ------4 --------------------------------------- using 3 ... v= (2L) 400Hz so if we wire of 1/2 as long...

k...let me struggle..abit...i seems to smell something already...hopefully it is not burnt... :) physic is just so challenging... what a rush...!

Homework Statement A stretched wire vibrates in its fundamental mode at a frequency of 400Hz. What would be the fundamental frequency if the wire were half as long, with twice the diameter and with four times the tension? Homework Equations fn = nV / 2L where n is the harmonics...

thaank...u... :)

Any kind soul to help me with this questions...i am stuck qn. The amplitude of vibration of a certain sound wave is increase by 50%. What is the corresponding increase in the decibel level of the sound? My attempt.. beta= 10 log ( I/Io) lets just take I = 2.0 x 10^-7 let just take...

Homework Statement What is the highest harmonic of this string that is within the typical human's audible range (up to 20000 Hz) String length of 16m u = liner density = 0.015 g/cm = 0.0015 kg/m stretched tension of the string = 557N Homework Equations v= sqrt ( F/ u) v= lamba...

this is for damped oscillation subject. not sure...look like a concept problem..but dun think it is so simple...maybe need to derive mathematically... anyway..here is my answer that i thought it over yesterday..what do you think? i) displacement amplitude at low frequencies x= F/wZ...

i got these question which i do not know how to do... Qn. In a forced mechanical oscillator, show that the following are frequency independent. i) the mechanical amplitude at low frequencies. ii) the velocity amplitude at velocity resonance. iii) the acceleration amplitude at high...