On a Saturday afternoon, you decide to pay a neighborhood kid to mow your lawn. The kid usesa manual push lawn mower with a mass of m=12 kg. The handle of the lawnmower is tiltedθ=53 degrees with respect to the vertical and the coefficient of kinetic friction between thelawnmower and the ground is μk=0.16. Assume that the kid is pushing parallel to the handle. A.Find an expression for much power the kid supplies to the lawnmower (Pkid) if thelawnmower is moving at a constant speed of vo=1.5 m/s. B.Find the numerical value for Pkid

Answer with Explanation:

We are given that

A.Mass,m=12 kg

Speed,v=1.5m/s

Net force in x direction must be zero

Net force in y direction

Power,P=Fv

Where

B.Substitute the values

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and ur welcm

: )

96.77 amp

explanation:

rl = 250/100 = 2.5 ohms.

egl = 250 + (100 × 0.1) + 2 = 262 v.

at 700 r.p.m., eg2 = 262 × 700/1000 = 183.4 v.

if ia is the new current, then eg2 - 2 - (ia × 0.1) = 2.5 ia

which means this will give ia = 96.77 amp.