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January 28, 2015

January 28, 2015

Posted by **sarsi** on Thursday, September 19, 2013 at 3:11am.

- physics -
**Graham**, Thursday, September 19, 2013 at 3:32amPower is rate of work.

Work is force times displacement.

Force is weight of each brick under gravity. Measure weight in [kgf] (kilogram-force: the weight of 1[kg] in normal gravity).

The conversion rate to metric horsepower is: 1[hp] = 75 [kgf·m/s]

Use: P = Ws/t

Where:

(1/t) = 12[/min] = 0.2[/s]

s = 3.3[m]

W = 3.75[kgf]

- physics -
**Devron**, Thursday, September 19, 2013 at 3:39am12 bricks/min*(1min/60s)=0.2bricks/s

m=(3.75kg/brick)

F=mg=(3.75kg/brick)*9.8m/s^2=36.75N/brick

d=3.3m

Since Power=Work/t(s)=F*d/t

Power=(36.75N/brick)*(0.2bricks/s)*(3.3m)=24.3 W

***Bricks cancel leaving (N*m)/s

24.3 W*(1hp/745.70 W)=0.0325 hp

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