Aperson travels by car from one city to another with different constant speeds between pairs of cities. she drives for 25.0 min at 95.0 km/h, 16.0 min at 100.0 km/h, and 50.0 min at 40.0 km/h and spends 30.0 min eating lunch and buying gas. determine the average speed for the trip.

49.8 km/h

Explanation:

We can determine the average speed by calculating the total distance covered and the time taken,

- First part of the trip:

v1 = 95.0 km/h = 26.4 m/s

t1 = 25.0 min = 1500 s

Distance covered:

- Second part of the trip:

v2 = 100.0 km/h = 27.8 m/s

t2 = 16.0 min = 960 s

Distance covered:

- Third part of the trip:

v3 = 40.0 km/h = 11.1 m/s

t3 = 50.0 min = 3000 s

Distance covered:

The person also spend 30.0 min without moving:

t4 = 30.0 min = 1800 s

Total distance covered:

Total time taken:

So, the average speed is

  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

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer