Arunning relay team ran a 400 meter race in a record-setting time of 36 seconds. what was their average speed to the nearest tenth of a meter per second?
a 0.09 meters per second
b 0.36 meters per second
c 9.0 meters per second
d 11.1 meters per second

Option D.

Step-by-step explanation:

we know that

To find the average speed divide the total distance by the total time

so

Answer-

Concentration of hydronium ion of apple juice is stronger than that of the water. And it is times stronger.

Solution-

Given in the question,

pH of the apple juice = 2.9

pH of water = 7

Formula for pH is,

Where,

= Hydronium ion concentration

Putting the values in the formula,

As, , so the apple juice has a higher concentration of hydronium ions.

Therefore, concentration of hydronium ion of apple juice is stronger than that of the water.