ElectricPavlov

The volume of the stack is the sum of its parts

5 x 4 x 7     +      12 x 14 x 11       +       24 x 18 x24     = 12356 in^3    = 7.15 ft^3

Volume of each pyramid is given by    a^2 h/3     a = 5  h = 7

Volume = 25 * 7/3 = 58 1/3 cm^3    for EACH      total volume would be = 2 x 58.33 = 116 2/3 cm^3

To use as a timer , you would likely only use the  58  1/3 cm^3 volume so the sand could trickle out of one and into the other pyramid.

2^18    or   7^6*3    3^15*5     10^8*7       from question heading....I guess

2 2/3  x  1 1/8  x  1 1/5   ft^3

8/3  x 9/8  x 6/5   = 432/120 = 18/5 = 3 3/5 ft^3

Exactly in the middle  between the two of them is  1/4.

Tan  = sin / cos    at 180 degrees =  0 /(-1) = 0

5 x 10^-4       Move the decimal point 4 places LEFT to get     =  .0005

Realize the table is PERCENTAGES of 200.....you probably found 13%    13% of 200 = 26

Acceleration is change in velocity over time.  In this example it will be a NEGATIVE acceleration as the car slows.

(Vf-Vo ) /  time   =  (45 - 85 m/s) / 4.5 s =  - 8.89 m/s^2

3 hours x 65 miles/hour = 195 miles

195 miles/60mph = 3.25 hours

Originally 3 hours  now 3.25 hours       .25 hours longer with stop    .25 hr = 15 minutes.