A mass slides from rest down a 45 degree incline that has a coefficient of kinetic friction equal to 0.2. What is the speed of the mass after it has slid for a total of 2 meters?

The speed of the mass after it has slid for a total of 2 meters is 4.71 m/s.

Explanation:

The speed of the mass can be found using Newton second law:

Where Pₓ is the weight force in the horizontal direction and is the friction force.  

Now, we can find the speed of the mass using the following kinematic equation:

Therefore, the speed of the mass after it has slid for a total of 2 meters is 4.71 m/s.

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  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

total distance/total time

(85 + 82)/(5+3)

167/8

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