Question

Approximate the work required to lift a 2.5-kg object to a height of 6.0 meters. A student applies a force to a cart to pull it up an inclined plane at a constant speed during a physics lab. A force of 20.8 N is applied parallel to the incline to lift a 3.00-kg loaded cart to a height of 0.450 m along an incline which is 0.636-m long. Determine the work done upon the cart and the subsequent potential energy change of the cart. Eddy, whose mass is 65-kg, climbs up the 1.6-meter high stairs in 1.2 s. Approximate Eddy's power rating.

Answer 1

Answer:

Explanation:

(a)mass $m= 2.5 kg$

height $h=6 m$

work required to raise

$W=mgh$

$W=2.5\times 9.8\times 6=147 J$

(b)Force $F=20.8 N$

mass of cart $m=3 kg$

length of track $s=0.636 m$

$Work\ done=F\cdot s$

Work done$=20.8\cdot 0.636=13.22 J$

(c)mass of eddy $m_e=65 kg$

height climbed $h=1.6 m$

time $t=1.2 s$

Energy required $E=mgh=65\times 9.8\times 1.6=1019.2 J$

$power=\frac{E}{t}=\frac{1019.2}{1.2}=849.33 W$