What is 1 + -1 and the area of my mom
1 answer:
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The volume of a fluid that flows past a point per unit time through an area is known as the flow rate, Q
The depth of water in the pan after one hour is <u>0.72 meters</u>
Reason:
The given parameters are;
The volume occupied by one rain drop = 1 cm³
The area of the square base of the pan = 1 meter by 1 meter
Duration of the rain, t = 1 hour
Rate at which rain falls = 2 raindrops per second
Region where the rain falls = 10 cm by 10 cm
Depth of water in the pan after 1 hour = Required
Solution:
The number of seconds in 1 hour = 3,600 seconds
Number of raindrops in a 10 cm by 10 cm region, <em>n</em>, is given as follows;
n = 10 drops × 10 drops = 100 drops
Number of raindrops in 1 hour = 2 × 100 drops/s × 3,600 s = 720,000 drops
Volume of water in the rain, V = 720,000 drops × 1 cm³/drop = 720,000 cm³
Area of the pan = 1 m × 1 m = 100 cm × 100 cm = 10,000 cm²
Cross sectional area of the pan = 10,000 cm²
Therefore;
- The depth of water in the pan after one hour, d = 72 cm = 0.72 m
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<h3>Answer:</h3>
60 days
<h3>Explanation:</h3>Half-life is the amount of time it takes half of a substance to decay away.
Guess and Check
One method for solving half-life problems like this is to guess and check. To do this, we can continue to divide 475mg by 2 until we get to 30mg.
- 475 ÷ 2 = 237.5
- 237.5 ÷ 2 = 118.75
- 118.75 ÷ 2 = 59.375
- 59.375 ÷ 2 = 29.6875
As seen here, it takes approximately 4 half-lives for this sample of Ra-225 to decay to 30mg. Now, we can multiply 4 by the length of the half-life, 15 days.
- 4 * 15 = 60 days.
Fractions
Another way to solve this is to use fractions.
- 30 is about 1/16 of 475
- 16 is equivalent to
.
This means that it takes 4 half-lives for 475mg to decay to 30mg. Using the same method above, we can tell that 4 half-lives are 60 days.
Important Note
In this question, I rounded occasionally. So, not all of the values are exact, but they are all very close.