Part A

A $160-lb$ block is pulled up by a constant force $P$ through a cable to move up

the inclined surface with a constant acceleration of $a=3f\frac{t}{s^2}.$ The coefficient

of kinetic friction between the block and the inclined surface is ${}_K=0\mathrm{.}25.$

The angle between the cable and inclined surface as shown is $=42.$

Neglect size of the block,$($Figure $1)$

Determine the magnitude of the force $P$ applied on the cable.

Express your answer to three significant figures and include the appropriate units.

$P=$

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Part B

Determine the normal force $N$ exerted on the block from the inclined surface.

Express your answer to three significant figures and include the appropriate units.

$N=$