Answer:
$41.47
Step-by-step explanation:
Answer:
Step-by-step explanation:7/10 is the answer
First step is to convert feet to kilometers. 2 kilometers is approximately equal to 6,560 ft.
Keeping that number in mind, we need to find the circumference of the circle. We need this number because that is the exact distance the wheel will travel in a single revolution. We can use the equation c=pi(d) to get it, or use the more commonly cited formula c=2pi(r), with a few added steps. Since we're given the diameter, not the radius, the first formula makes more sense.
The circumference is roughly equal to 6.28. That means the bike travels 6.28 feet for every complete revolution. Since that's 6.28 feet for every SINGLE revolution, we can simply divide the total distance the bike traveled (6560 ft) by the distance which it travels per revolution (6.28).
6560 ft divided by 6.28 ft/1 revolution = 1044.59 revolutions.
Answer:
It will take 0.72s for the football to hits the ground.
Step-by-step explanation:
We have that the equaation for the height of the football is
The football will hit the ground when .
Multiplying by -1
To solve this equation, we need the bhaskara formula:
Given a second order polynomial expressed by the following equation:
.
This polynomial has roots such that , given by the following formulas:
In this problem, we have that:
So
It cannot take negative seconds for the ball to hit the ground.
So it will take 0.72s for the football to hits the ground.