Physics - Heat & Thermo Question with Solution | TestHub

Hydrogen ions of mass $1.67\times 10^{-27}$ kg strike a stationary, thermally insulated target at $3\times 10^7$ m $s^{-1}$, $2\times 10^{15}$ ions per second. The target has mass 400 g and specific heat $0.11$ cal $g^{-1}$°$C^{-1}$. Find the time in seconds for its temperature to rise by $50^{\circ }$C if all the ion energy becomes heat (one decimal, 1 cal = $4.18$ J).