..but as he drove his lance-point into the sail the wind whirled it round with such force that it shivered the lance to pieces,
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Answer:
The size of the sample needed = 67.65
Explanation:
Given that :
The margin of error = 10% = 0.10
The confidence level = 90% = 0.90
Level of significance = 1 - 0.90 = 0.10
At ∝ = 0.10
Since the proportion of people that supported him/her is not given, we assumed p = 0.50
The margin of error formula can be expressed as:
Squaring both sides; we have:
n = 67.65
Therefore, the required sample size = 67.65
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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