Question Number 51637 by Necxx last updated on 29/Dec/18 $${An}\:{object}\:\mathrm{60}{cm}\:{tall}\:{is}\:{placed}\:{on} \\ $$$${the}\:{principal}\:{axis}\:{of}\:{a}\:{convex}\:{lens} \\ $$$${and}\:{its}\:\mathrm{30}{cm}\:{tall}\:{image}\:{is}\:{formed} \\ $$$${on}\:{the}\:{screen}\:{placed}\:{at}\:{a}\:{distance} \\ $$$${of}\:\mathrm{40}{cm}\:{from}\:{the}\:{object}.{What}\:{is} \\ $$$${the}\:{focal}\:{length}\:{of}\:{the}\:{lens}? \\ $$ Answered by aseerimad…
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Question Number 175059 by mr W last updated on 17/Aug/22 Commented by mr W last updated on 17/Aug/22 $${a}\:{solid}\:{hemisphere}\:{with}\:{mass}\:{M}\:{and} \\ $$$${radius}\:{R}\:{is}\:{connected}\:{with}\:{a}\:{thin}\:{rod}\: \\ $$$${with}\:{mass}\:{m}\:{and}\:{length}\:{L}\:{at}\:{the}\: \\ $$$${center}.…
Question Number 109470 by pticantor last updated on 24/Aug/20 Commented by pticantor last updated on 24/Aug/20 $$\boldsymbol{{please}}\:\boldsymbol{{help}}\:\boldsymbol{{me}}\:\boldsymbol{{to}}\:\boldsymbol{{show}}\:\boldsymbol{{the}} \\ $$$$\boldsymbol{{differential}}\:\boldsymbol{{equation}}\:\boldsymbol{{of}} \\ $$$$\boldsymbol{{that}}\:\boldsymbol{{systeme}}\:\boldsymbol{{please}} \\ $$ Terms of…
Question Number 41964 by Necxx last updated on 16/Aug/18 $${Prof}\:{Kintush}\:{has}\:{a}\:{near}\:{point}\:{of} \\ $$$$\mathrm{45}{cm}\:{and}\:{his}\:{far}\:{point}\:{is}\:{infinity}. \\ $$$${What}\:{type}\:{of}\:{lens}\:{and}\:{focal}\:{length} \\ $$$${should}\:{be}\:{recommended}\:{for}\:{his} \\ $$$${normal}\:{reading}? \\ $$ Commented by tanmay.chaudhury50@gmail.com last updated…
Question Number 41962 by Necxx last updated on 16/Aug/18 $${A}\:{student}\:{holding}\:{a}\:\mathrm{324}{Hz}\:{tuning} \\ $$$${fork}\:{approaches}\:{a}\:{wall}\:{at}\:{a}\:{speed} \\ $$$${of}\:\mathrm{6}{ms}^{−\mathrm{1}} .{The}\:{speed}\:{of}\:{sound}\:{in}\:{air} \\ $$$${is}\:\mathrm{336}{ms}^{−\mathrm{1}} .{What}\:{frequency}\:{will} \\ $$$${the}\:{student}\:{detect}\:{from}\:{waves} \\ $$$${omitted}\:{from}\:{the}\:{fork}\:{and}\:{waves} \\ $$$${coming}\:{from}\:{the}\:{wall}? \\…
Question Number 40499 by Necxx last updated on 23/Jul/18 $${A}\:{particle}\:{of}\:{mass}\:\mathrm{2}×\mathrm{10}^{−\mathrm{27}} {kg}\:{moves} \\ $$$${according}\:{to}\:{the}\:{following} \\ $$$${y}=\mathrm{5}{cos}\left(\frac{\pi{t}}{\mathrm{3}}+\frac{\pi}{\mathrm{4}}\right) \\ $$$${find}\:{the}\:{maximum}\:{kinetic}\:{energy} \\ $$ Answered by tanmay.chaudhury50@gmail.com last updated on…
Question Number 38924 by NECx last updated on 01/Jul/18 $${A}\:{wave}\:{has}\:{a}\:{wavelength}\:{of}\:\mathrm{1}.\mathrm{5}{m}, \\ $$$${calculate}\:{the}\:{phase}\:{angle}\:{between} \\ $$$${a}\:{point}\:\mathrm{0}.\mathrm{25}{m}\:{from}\:{the}\:{peak}\:{of}\:{the} \\ $$$${wave}\:{and}\:{another}\:{point}\:\mathrm{1}{m}\:{further} \\ $$$${along}\:{the}\:{same}\:{peak}. \\ $$ Answered by tanmay.chaudhury50@gmail.com last updated…
Question Number 38822 by NECx last updated on 30/Jun/18 $${The}\:{incident}\:{wave}\:{set}\:{up}\:{on}\:{a}\:{string} \\ $$$${of}\:{length}\:{fixed}\:{at}\:{each}\:{end}\:{is}\:{given} \\ $$$${by}:\:\:\:{y}_{\mathrm{1}} ={Asin}\left({kx}−{wt}\right) \\ $$$$\left.{i}\right){what}\:{is}\:{the}\:{equation}\:{of}\:{motion} \\ $$$${of}\:{the}\:{reflected}\:{wave},{y}_{\mathrm{2}} . \\ $$$$\left.{ii}\right){obtain}\:{the}\:{resultant},{y}={y}_{\mathrm{1}} +{y}_{\mathrm{2}} \\ $$$${of}\:{the}\:{two}\:{waves}.…
Question Number 38816 by NECx last updated on 30/Jun/18 $${Two}\:{waves}\:{are}\:{represented}\:{by} \\ $$$${y}_{\mathrm{1}} ={Asin}\omega{t}\:{and}\:{y}_{\mathrm{2}} ={Asin}\left(\omega{t}−\delta\right). \\ $$$${What}\:{is}\:{the}\:{resultant}\:{of}\:{the}\:{two} \\ $$$${waves}? \\ $$$$\left.{ii}\right){determine}\:{the}\:{amplitude}\:{of}\:{the} \\ $$$${resultant}\:{wave}\:{and}\:{under}\:{which} \\ $$$${condition}\:{will}\:{it}\:{be}\:{constructive}\:{or} \\…