Renee is on spring break and pulling her 21-kg suitcase through the airport at a constant speed of 0.47 m/s. she pulls on the strap with 120 n of force at an angle of 38° above the horizontal. determine the normal force and the total resistance force (friction and air resistance) experienced by the suitcase.

This problem can be directly solved by drawing the free body diagram (see attached photo)

The normal force = 131.92N and the total resistance force = 94.56N because the suitcase is not accelerating (acceleration = 0) so the total forces must balance, hence we can say that the resistance force is equal to the horizontal component of her pulling force.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂