Question Number 105037 by Dwaipayan Shikari last updated on 25/Jul/20 $${A}\:{heavy}\:{man}\:,\:{slips}\:\:{from}\:{a}\:{roof}\:{of}\:{a}\:{high}\:{building}\:{of} \\ $$$${height}\:'{H}'.\:{When}\:{he}\:{was}\:{at}\:{a}\:{height}\:{of}\:'{h}'\:\:{he}\:{realised}\:{that}\:{the} \\ $$$${ground}\:{beneath}\:{him}\:{was}\:{pretty}\:{hard}.\:{To}\:{avoid}\:{injury},\:{he}\:{thrown} \\ $$$${away}\:{his}\:{suitcase}\:{of}\:{mass}\:'{m}'.\:{After}\:{doing}\:{this},{he}\:{prevented}\:{his} \\ $$$${falling}\:{on}\:{the}\:{hard}\:{ground}\:{and}\:{fell}\:{on}\:{a}\:{pond}.\:{The}\:{mass}\:{of}\:{the} \\ $$$${man}\:{was}\:'{M}'.\:{The}\:{distance}\:{of}\:{the}\:{pond}\:{from}\:{the}\:{hard}\:{ground}\:{was}\: \\ $$$$'{x}'.{And}\:{he}\:{just}\:{avoided}\:{from}\:{falling}\:{on}\:{the}\:{hard}\:{ground}. \\ $$$$…
Question Number 170546 by libaolin last updated on 26/May/22 $${Solve}:{quadratic}\:{equation}\:{about}\:{t}: \\ $$$$\mathrm{1}.\mathrm{h}=\mathrm{v}_{\mathrm{0}} \mathrm{t}+\frac{\mathrm{1}}{\mathrm{2}}\mathrm{gt}^{\mathrm{2}} ,\mathrm{2}.\mathrm{x}=\mathrm{v}_{\mathrm{0}} \mathrm{t}+\frac{\mathrm{1}}{\mathrm{2}}\mathrm{at}^{\mathrm{2}} \\ $$$$\mathrm{solve}\:\mathrm{v}:{v}^{\mathrm{2}} −{v}_{\mathrm{0}} ^{\mathrm{2}} =\mathrm{2}{ax} \\ $$ Answered by Rasheed.Sindhi…
Question Number 104987 by mr W last updated on 25/Jul/20 Commented by mr W last updated on 25/Jul/20 $${a}\:{block}\:{with}\:{mass}\:{m}_{\mathrm{1}} \:{and}\:{velocity}\:{v}_{\mathrm{1}} \\ $$$${collides}\:{with}\:{an}\:{other}\:{block}\:{with} \\ $$$${mass}\:{m}_{\mathrm{2}} \:{in}\:{rest}.\:{after}\:{the}\:{collision}…
Question Number 170284 by sciencestudent last updated on 19/May/22 Commented by sciencestudent last updated on 19/May/22 $${A}\:{football}\:{player}\:{weighing}\:\mathrm{200}{Lb}\:{flies} \\ $$$${up}\:{to}\:\mathrm{7}{miles}\:{in}\:{a}\:{plane}\:{according}\:{to} \\ $$$${the}\:{figure}\:{above},\:{so}\:{how}\:{much}\:{weight} \\ $$$${does}\:{a}\:{football}\:{player}\:{lose}? \\ $$…
Question Number 170120 by mr W last updated on 16/May/22 Commented by mr W last updated on 17/May/22 $${A}\:{truck}\:{with}\:{mass}\:\boldsymbol{{M}}\:{is}\:{moving}\:{on} \\ $$$${a}\:{horizontal}\:{and}\:{straight}\:{road}\:{with} \\ $$$${speed}\:\boldsymbol{{v}}.\:{A}\:{small}\:{box}\:{with}\:{mass}\:\boldsymbol{{m}}\:{lies} \\ $$$${at}\:{the}\:{end}\:{of}\:{the}\:{luggage}\:{compartment}…
Question Number 170028 by Best1 last updated on 14/May/22 $${verify}\:{that}\:\:\langle{p}_{{x}} \mid\hat {{x}}\mid\Psi\rangle={ih}\frac{{d}}{{dp}_{{x}} }<{p}_{{x}} \mid\Psi> \\ $$ Commented by Best1 last updated on 14/May/22 $${please}\:{help}\:{me} \\…
Question Number 170015 by Best1 last updated on 14/May/22 $${verify}\:{that}\:{the}\:{force}\: \\ $$$$\:{F}={xyi}+{xyj}+{yzk}\:{is} \\ $$$$\:{conservative} \\ $$ Answered by ajfour last updated on 14/May/22 $${dW}={xydx}+{xydy}+{yzdz} \\…
Question Number 170005 by ajfour last updated on 13/May/22 Commented by ajfour last updated on 14/May/22 $${A}\:{moves}\:{in}\:{circle}\:{with}\: \\ $$$${speed}\:{u},\:{while}\:{B}\:{down}\:{the} \\ $$$${vertical}\:{diameter}\:{with}\:{speed} \\ $$$${u}\mathrm{cos}\:\theta,\:{where}\:\theta\:{is}\:{shown}, \\ $$$${what}\:{to}\:{mean}.\:{Given}\:{initial}…
Question Number 104299 by aurpeyz last updated on 20/Jul/20 $$\mathrm{an}\:\mathrm{astraonaut}\:\mathrm{weighs}\:\mathrm{3200N}\:\mathrm{on}\:\mathrm{a}\:\mathrm{planet}\:\mathrm{whose}\:\mathrm{mass}\:\mathrm{is}\:\mathrm{the}\:\mathrm{same}\:\mathrm{as}\:\mathrm{that}\:\mathrm{of}\:\mathrm{the}\:\mathrm{earth}\:\mathrm{but}\:\mathrm{whose}\:\mathrm{radius}\:\mathrm{is}\:\mathrm{half}\:\mathrm{that}\:\mathrm{of}\:\mathrm{the}\:\mathrm{earth}.\:\mathrm{the}\:\mathrm{astronsut}\:\mathrm{weight}\:\mathrm{on}\:\mathrm{the}\:\mathrm{earth}\:\mathrm{is}\:\mathrm{what}? \\ $$ Answered by OlafThorendsen last updated on 20/Jul/20 $${g}_{\mathrm{planet}} \:=\:\frac{\mathrm{M}_{\mathrm{planet}} \mathrm{G}}{\mathrm{R}_{\mathrm{planet}} ^{\mathrm{2}} } \\…
Question Number 104301 by aurpeyz last updated on 20/Jul/20 $$\mathrm{a}\:\mathrm{girl}\:\mathrm{weighs}\:\mathrm{569}.\mathrm{37N}\:\mathrm{on}\:\mathrm{the}\:\mathrm{earth}\:\mathrm{surfsce}\:\left(\mathrm{a}\right)\:\mathrm{what}\:\mathrm{would}\:\mathrm{she}\:\mathrm{weigh}\:\mathrm{at}\:\mathrm{a}\:\mathrm{height}\:\mathrm{above}\:\mathrm{the}\:\mathrm{earth}\:\mathrm{surface}\:\mathrm{of}\:\mathrm{one}\:\mathrm{earth}\:\mathrm{radius}?\:\mathrm{what}\:\mathrm{would}\:\mathrm{her}\:\mathrm{mass}\:\mathrm{be}? \\ $$ Commented by mr W last updated on 20/Jul/20 $${what}\:{if}\:{you}\:{don}'{t}\:{write}\:{the}\:{whole} \\ $$$${post}\:{in}\:{a}\:{single}\:{line}?\:{thanks}! \\ $$…