Cotton has a higher tendency to attract electrons than human skin. when kevin pulls his cotton shirt off his body, the electrons get transferred from the to the . so, the shirt becomes charged and kevin's body becomes charged.

When kelvin pulls cotton shirt off his body, the electrons get transferred from the shirt in the form of static charges that means electrons to the body. So, the shirt becomes positively charged and his body becomes negatively charged.  

So, the transfer of charge from shirt to the body will takes place. And also we can hear a crackling sound. We can hear it and observe it as a sparkle.

Therefore the cotton has higher tendency to attract the electrons than human skin.  

trig 15.3 cos

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards