A 5.0 kg penguin sits on a 10 kg sled, as shown in FigureP4.54. A horizontal for

Question

A 5.0 kg penguin sits on a 10 kg sled, as shown in FigureP4.54. A horizontal force of 45 N is applied to the sled, butthe penguin attempts to impede the motion by holding onto a cordattached to a wall. The coefficient of kinetic frictionbetween the sled and the snow, as well as that between the sled andthe penguin, is 0.20.

a) Determine the tension in the cord.
b) Find the acceleration of the sled.

A 5.0 kg penguin sits on a 10 kg sled, as shown in FigureP4.54. A horizontal force of 45 N is applied to the sled, butthe penguin attempts to impede the motion by holding onto a cordattached to a wall. The coefficient of kinetic frictionbetween the sled and the snow, as well as that between the sled andthe penguin, is 0.20.

a) Determine the tension in the cord.
b) Find the acceleration of the sled.

Explanation / Answer

(a) the tension in the cord T=0.2*5*g=9.8 N (b) the acceleration of the sled a=[45-1-15*g*0.2]/15=0.973m/s2

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