Recent content by tambourine

interference in thin films: A transparent oil (n=1.29) spills onto the surface of water (n=1.33), producing a maximum of reflection with normally incident orange light, with a wavelength of 6.00 x 10^-7 m in air. Assuming the maximum occurs in the first order, determine the thickness of the...

Homework Statement A diffraction grating produces a third-order maximum, at an angle of 22 degrees, for red light (694.3 nm). Determine the spacing of the lines. Homework Equations for maxima: sin θm = mλ/d where m is the order of the maxima, λ is the wavelength in nm, and d is...

if a block in motion hits one at rest, Ek1i = Ek1f + Ek2f could i also use V1i + V1f = V2i + V2f?

Homework Statement A standard scale (shown below) has an internal spring and a dial which shows the force exerted on the pan by this spring. The instrument has a mass of about 1 kg and weight 10 N. Ignore the weight of the light pan. To conserve space, the new metric commissioner stacks a...

ohhh so then for part b it would be: F = ma = kx - mg 70a = 117.9 (19) - 70(9.81) a = 22.2

Homework Statement A 70 kg bungee jumper leaps off a bridge. She is tied to a 12 m long bungee cord and falls a total of 31 m. Calculate: a) the spring constant of the bungee b) the maximum acceleration experience by the jumper Homework Equations F = kx Eg = Ee where g is...

great! thanks i will probably be back though. :shy:

solving A: -15.846 + 0.3Fa = 0 0.3mg = 15.846 9.81m = 52.82 m = 5.4 for the normal force: F = 0 Fn = Fa + Fb + Fs + Fe Fn = 52.82 + 19.62 + 19.62 + 58.86 Fn = 150.9 the normal force only has a vertical component, right?

Tb - Ts - Te + Ta = 0 0.15(19.62) - 0.4(19.62)sin20 - 0.8(58.86)sin20 + 0.3Fa = 0 before i go any further, are these the correct positive/negative signs?

thanks jay. here's what I've got: i changed the pivot to the bottom of the support (right above B)--(easier to calculate angles and r) Fs = mg = 2(9.81) = 19.62 Fe = 6(9.81) = 58.86 Fb = 2(9.81) = 19.62 normal is n T = rFsinθ where r is the distance from the pivot to where...

Homework Statement To make larger pictures, an enlarger can be moved to the edge of a table so that the image is projected onto the floor, as shown. mass of bass = 2.0 kg mass of support = 2.0 kg mass of enlarger = 6.0 kg a) What is the minimum mass that needs to be added on the...

oh, i can't see numbers straight anymore. meant 3.5. thank you alphysicist :D

3mg - mg = ma so 2mg = ma ?

so.. the rope pulls up at her, equal and simultaneous- Fnet = ma if down is positive: Fg - Ft = ma 3mg - Ft = ma ?

thanks for the responses! tiale11, i don't quite understand what you did. how did you solve using the kinetic energy formula if mass wasn't given? i got t=1.87 by plugging d=60 m, V1=0, and a=34.3 into d=V1t + 1/2at^2 alphysicist, this is the concept I'm having trouble with. would the...