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27 Nov 2019

Sound exits a diffraction horn loudspeaker through a rectangularopening. The loudspeaker is mounted outside on a pole. In winter,when the temp is 273K, the
diffraction angle is 15.0 degrees. What is the diffraction anglewhent he temp is 311K? I am just unsure what equation to use.

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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Hello,

I am just looking for a step my step way to solve for thisproblem Do I just use the magnetic flux equation if so I am only concerned with the 45 degree anglebecause it has a direct correlation to the B field ?

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If a virtual image is formed 9.0 cm along the principal axis from aconvex mirror of focal length –15.0 cm, how far is the object fromthe mirror?

2. A woman looking in a makeup mirror sees her face at twice itsactual size and right-side up. If she is 26.0 cm from the mirror,what is its focal length?

3. Which of the following best describes the image of a concavemirror when the object is at a distance greater than twice thefocal point distance from the mirror?
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d. real, inverted and magnification greater than one

4. A convex mirror with focal length of ?18 cm forms an image 12 cmbehind the surface. Where is the object located as measured fromthe surface?

5. A convex mirror with a focal length of ?18 cm forms an image 15cm behind the surface. If the object height is 1.2 cm what is theimage height?

6. An object placed 14 cm from a concave mirror produces a realimage 8.0 cm from the mirror. If the object is now moved to a newposition 18.0 cm from the mirror, where is the new image located asmeasured from the mirror?

7. When the reflection of an object is seen in a concave mirror theimage will:

8. A candle is 40.0 cm in front of a convex spherical mirror ofradius of curvature 70.0 cm. What are the image distance and themagnification, respectively?

9. An object is 16.0 cm from the surface of a spherical Christmastree ornament that is 8.00 cm in diameter. What is themagnification of the image?

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15. A contact lens is made of plastic with an index of refraction1.50. The lens has an outer radius of curvature of +2.0 cm and aninner radius of curvature of +2.5 cm. What is its focallength?

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17. A Young’s double-slit apparatus is set up so that a screen ispositioned 1.9 m from the double slits, and the spacing between thetwo slits is 0.040 mm. What is the distance between alternatingbright fringes on the screen if the light source has a wavelengthof 630 nm? (1 nm = 10?9 m)

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Figure 28-50 shows a wood cylinder of mass m = 0.211 kg and lengthL = 0.0772 m, with N = 15.0 turns of wire wrapped around itlongitudinally, so that the plane of the wire coil contains thelong central axis of the cylinder. The cylinder is released on aplane inclined at an angle ? to the horizontal, with the plane ofthe coil parallel to the incline plane. If there is a verticaluniform magnetic field of magnitude 0.627 T, what is the leastcurrent i (in A) through the coil that keeps the cylinder fromrolling down the plane?

its chapter 28 problem 53 in the fundamentals of physics 8ebook.

i'm just not getting how they found A=2rL and not 2prL.. everythingelse i get.

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