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The-system-is-initially-at-origin-and-is-moving-with-a-velocity-3-m-s-k-A-force-120t-newton-i-acts-on-mass-m-2-where-t-is-time-in-seconds-The-man-throws-a-light-ball-at-the-instant-when

Question Number 22574 by Tinkutara last updated on 20/Oct/17 $$\mathrm{The}\:\mathrm{system}\:\mathrm{is}\:\mathrm{initially}\:\mathrm{at}\:\mathrm{origin}\:\mathrm{and}\:\mathrm{is} \\ $$$$\mathrm{moving}\:\mathrm{with}\:\mathrm{a}\:\mathrm{velocity}\:\left(\mathrm{3}\:\mathrm{m}/\mathrm{s}\right)\:\overset{\wedge} {{k}}.\:\mathrm{A} \\ $$$$\mathrm{force}\:\left(\mathrm{120}{t}\:\mathrm{newton}\right)\:\overset{\wedge} {{i}}\:\mathrm{acts}\:\mathrm{on}\:\mathrm{mass}\:{m}_{\mathrm{2}} , \\ $$$$\mathrm{where}\:{t}\:\mathrm{is}\:\mathrm{time}\:\mathrm{in}\:\mathrm{seconds}. \\ $$$$\mathrm{The}\:\mathrm{man}\:\mathrm{throws}\:\mathrm{a}\:\mathrm{light}\:\mathrm{ball},\:\mathrm{at}\:\mathrm{the} \\ $$$$\mathrm{instant}\:\mathrm{when}\:{m}_{\mathrm{1}} \:\mathrm{starts}\:\mathrm{slipping}\:\mathrm{on}\:{m}_{\mathrm{2}} ,…

A-cylinder-of-weight-200-N-is-supported-on-a-smooth-horizontal-plane-by-a-light-cord-AC-and-pulled-with-force-of-400-N-The-normal-reaction-at-B-is-equal-to-

Question Number 22499 by Tinkutara last updated on 19/Oct/17 $$\mathrm{A}\:\mathrm{cylinder}\:\mathrm{of}\:\mathrm{weight}\:\mathrm{200}\:\mathrm{N}\:\mathrm{is}\:\mathrm{supported} \\ $$$$\mathrm{on}\:\mathrm{a}\:\mathrm{smooth}\:\mathrm{horizontal}\:\mathrm{plane}\:\mathrm{by}\:\mathrm{a}\:\mathrm{light} \\ $$$$\mathrm{cord}\:{AC}\:\mathrm{and}\:\mathrm{pulled}\:\mathrm{with}\:\mathrm{force}\:\mathrm{of}\:\mathrm{400}\:\mathrm{N}. \\ $$$$\mathrm{The}\:\mathrm{normal}\:\mathrm{reaction}\:\mathrm{at}\:{B}\:\mathrm{is}\:\mathrm{equal}\:\mathrm{to} \\ $$ Commented by Tinkutara last updated on 19/Oct/17…

A-ball-of-mass-400-g-travels-horizontally-along-the-ground-and-collides-with-a-wall-The-velocity-time-graph-below-represents-the-motion-of-the-ball-for-the-first-1-2-seconds-The-magnitude-of-average

Question Number 22492 by Tinkutara last updated on 19/Oct/17 $$\mathrm{A}\:\mathrm{ball}\:\mathrm{of}\:\mathrm{mass}\:\mathrm{400}\:\mathrm{g}\:\mathrm{travels}\:\mathrm{horizontally} \\ $$$$\mathrm{along}\:\mathrm{the}\:\mathrm{ground}\:\mathrm{and}\:\mathrm{collides}\:\mathrm{with}\:\mathrm{a} \\ $$$$\mathrm{wall}.\:\mathrm{The}\:\mathrm{velocity}-\mathrm{time}\:\mathrm{graph}\:\mathrm{below} \\ $$$$\mathrm{represents}\:\mathrm{the}\:\mathrm{motion}\:\mathrm{of}\:\mathrm{the}\:\mathrm{ball}\:\mathrm{for}\:\mathrm{the} \\ $$$$\mathrm{first}\:\mathrm{1}.\mathrm{2}\:\mathrm{seconds}. \\ $$$$\mathrm{The}\:\mathrm{magnitude}\:\mathrm{of}\:\mathrm{average}\:\mathrm{force}\:\mathrm{between} \\ $$$$\mathrm{the}\:\mathrm{ball}\:\mathrm{and}\:\mathrm{the}\:\mathrm{wall}\:\mathrm{is} \\ $$ Commented…

A-ladder-of-mass-m-is-leaning-against-a-wall-It-is-in-static-equilibrium-making-an-angle-with-the-horizontal-floor-The-coefficient-of-friction-between-the-wall-and-the-ladder-is-1-and-that-betw

Question Number 22479 by Tinkutara last updated on 19/Oct/17 $$\mathrm{A}\:\mathrm{ladder}\:\mathrm{of}\:\mathrm{mass}\:{m}\:\mathrm{is}\:\mathrm{leaning}\:\mathrm{against}\:\mathrm{a} \\ $$$$\mathrm{wall}.\:\mathrm{It}\:\mathrm{is}\:\mathrm{in}\:\mathrm{static}\:\mathrm{equilibrium}\:\mathrm{making} \\ $$$$\mathrm{an}\:\mathrm{angle}\:\theta\:\mathrm{with}\:\mathrm{the}\:\mathrm{horizontal}\:\mathrm{floor}. \\ $$$$\mathrm{The}\:\mathrm{coefficient}\:\mathrm{of}\:\mathrm{friction}\:\mathrm{between}\:\mathrm{the} \\ $$$$\mathrm{wall}\:\mathrm{and}\:\mathrm{the}\:\mathrm{ladder}\:\mathrm{is}\:\mu_{\mathrm{1}} \:\mathrm{and}\:\mathrm{that} \\ $$$$\mathrm{between}\:\mathrm{the}\:\mathrm{floor}\:\mathrm{and}\:\mathrm{the}\:\mathrm{ladder}\:\mathrm{is}\:\mu_{\mathrm{2}} . \\ $$$$\mathrm{The}\:\mathrm{normal}\:\mathrm{reaction}\:\mathrm{of}\:\mathrm{the}\:\mathrm{wall}\:\mathrm{on}\:\mathrm{the} \\…

A-long-plank-begins-to-move-at-t-0-and-accelerates-along-a-straight-track-with-a-speed-given-by-v-2t-2-for-0-t-2-After-2-s-the-plank-continues-to-move-at-the-constant-speed-acquired-A-smal

Question Number 22456 by Tinkutara last updated on 18/Oct/17 $$\mathrm{A}\:\mathrm{long}\:\mathrm{plank}\:\mathrm{begins}\:\mathrm{to}\:\mathrm{move}\:\mathrm{at}\:{t}\:=\:\mathrm{0} \\ $$$$\mathrm{and}\:\mathrm{accelerates}\:\mathrm{along}\:\mathrm{a}\:\mathrm{straight}\:\mathrm{track} \\ $$$$\mathrm{with}\:\mathrm{a}\:\mathrm{speed}\:\mathrm{given}\:\mathrm{by}\:{v}\:=\:\mathrm{2}{t}^{\mathrm{2}} \:\mathrm{for}\:\mathrm{0}\:\leqslant\:{t} \\ $$$$\leqslant\:\mathrm{2}.\:\mathrm{After}\:\mathrm{2}\:\mathrm{s},\:\mathrm{the}\:\mathrm{plank}\:\mathrm{continues}\:\mathrm{to} \\ $$$$\mathrm{move}\:\mathrm{at}\:\mathrm{the}\:\mathrm{constant}\:\mathrm{speed}\:\mathrm{acquired}. \\ $$$$\mathrm{A}\:\mathrm{small}\:\mathrm{block}\:\mathrm{initially}\:\mathrm{at}\:\mathrm{rest}\:\mathrm{on}\:\mathrm{the} \\ $$$$\mathrm{plank}\:\mathrm{begins}\:\mathrm{to}\:\mathrm{slip}\:\mathrm{at}\:{t}\:=\:\mathrm{1}\:\mathrm{s}\:\mathrm{and}\:\mathrm{stops} \\ $$$$\mathrm{sliding}\:\mathrm{at}\:{t}\:=\:\mathrm{3}\:\mathrm{s}.\:\mathrm{Find}\:\mathrm{the}\:\mathrm{coefficient}\:\mathrm{of}…

The-standard-heats-of-formation-of-at-298-K-for-CCl-4-g-H-2-O-g-CO-2-g-and-HCl-g-are-25-5-57-8-94-1-and-22-1-kcal-mol-1-respectively-Calculate-r-H-for-the-reaction-CCl-4-g-

Question Number 22447 by Tinkutara last updated on 18/Oct/17 $$\mathrm{The}\:\mathrm{standard}\:\mathrm{heats}\:\mathrm{of}\:\mathrm{formation}\:\mathrm{of}\:\mathrm{at} \\ $$$$\mathrm{298}\:\mathrm{K}\:\mathrm{for}\:\mathrm{CCl}_{\mathrm{4}} \left(\mathrm{g}\right),\:\mathrm{H}_{\mathrm{2}} \mathrm{O}\left(\mathrm{g}\right),\:\mathrm{CO}_{\mathrm{2}} \left(\mathrm{g}\right)\:\mathrm{and} \\ $$$$\mathrm{HCl}\left(\mathrm{g}\right)\:\mathrm{are}\:−\mathrm{25}.\mathrm{5},\:−\mathrm{57}.\mathrm{8},\:−\mathrm{94}.\mathrm{1}\:\mathrm{and} \\ $$$$−\mathrm{22}.\mathrm{1}\:\mathrm{kcal}\:\mathrm{mol}^{−\mathrm{1}} \:\mathrm{respectively}.\:\mathrm{Calculate} \\ $$$$\Delta_{\mathrm{r}} \mathrm{H}^{\circleddash} \:\mathrm{for}\:\mathrm{the}\:\mathrm{reaction} \\…