Ascience teacher tells her class that their final project requires students to measure a specific variable and determine the velocity of a car with no more than 2.5% error. jennifer and johnny work hard and decide the velocity of the car is 34.87 m/s. the teacher informs them that the actual velocity is 34.15 m/s. will jennifer and johnny pass their final project?

Yes

Explanation:

The velocity measured by Jennifer and Johnny is

The actual velocity is

We can calculate the % error of the students measurement as follows:

Which is lower than the 2.5% maximum error required, so the two students will pass the test.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

  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