A car parked on level pavement exerts a force of 10,000 newtons on the ground. What force does the pavement exert back on the car? (F = ma, g = 9.81 m/s2)
A.2,500 newtons
B.10,000 newtons
C.10,000 kilograms
D.0 newtons

B.

Explanation:

When equal forces are exerted onto eachother, they are exerting equal pressure since they are stationary.

the body's situation won't change the forces are equal opposit and on the same body

  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