box and slides down a $27\mathrm{.}0\backslash$deg slope under its own weight. The coefficient of kinetic friction between the

C

E$1\mathrm{.}22($m$)/($s$^(2))$

A $60\mathrm{.}0-$kg man stands at one end of a $20\mathrm{.}0-$kg uniform $10\mathrm{.}0-$m long board. How far from the man is the

center of mass of the man$-$board system?

B$24\mathrm{.}5$ra$($d$)/($s$)$

B$3\mathrm{.}70$ra$($d$)/($s$)$

C$7\mathrm{.}23$ra$($d$)/($s$)$

D$16\mathrm{.}8$ra$($d$)/($s$)$

E$17\mathrm{.}2$ra$($d$)/($s$)$

An acorn falls from a tree. Compare its kinetic energy K $,$ to its potential energy U $.$

AK increases and U decreases,

BK decreases and U increases.

CK increases and U increases.

DK decreases and U decreases.

E$(1)/(\backslash$sqrt$(3))$ of its original value.

E$12\mathrm{.}5$ra$($d$)/($s$)$ and a constant angular acceleration of

$3\mathrm{.}41$ra$($d$)/($s$^(2)).$ Through what angle does the pulley turn in $5\mathrm{.}26$ s $?$

A$900-$kg car traveling east at $15\mathrm{.}0($m$)/($s$)$ collides with a $750-$kg car traveling north at $20\mathrm{.}0($m$)/($s$).$ The cars

stick together. What is the speed of the wreckage just after the collision?

A$25\mathrm{.}0($m$)/($s$)$

B$6\mathrm{.}10($m$)/($s$)$

C$17\mathrm{.}3($m$)/($s$)$

D$12\mathrm{.}2($m$)/($s$)$

E$35\mathrm{.}0($m$)/($s$)$

An assault rifle fires an eight$-$shot burst in $0\mathrm{.}40$ s $.$ Each bullet has a mass of $7\mathrm{.}5$ g and a speed of $300$

as it leaves the gun. What is the average recoil force on the gun during that burst?

A