Once your rocket reaches space, the captain adjusts the speed. your captain goes from 24,000 km/hr to 17,000 km/hr over 90 seconds. what is your acceleration?

-21.6 m/s^2

Explanation:

First of all, we need to convert the initial and final velocities into m/s:

is the initial velocity

is the final velocity

The acceleration is given by

where

t = 90 s is the time elapsed

Substituting the numbers, we find

and the negative sign means the rocket is decelerating.

a coal burning power plant

  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