Answer:
The speed of the roll is 1239.52 revolutions per minut (1239.52 rpm).
Step-by-step explanation:
In this problem we want to know the angular speed of the roll, knowing its tangencial speed (1220 yards/hour).
The relation between the angular speed and the tangencial speed is
In this case we have a diameter of 3 cm and a velocity of 1220 yards/hour. So we can write
So the speed of the roll is 1239.52 revolutions per minut (1239.52 rpm).
Width of rectangle is 8.4 cm
Step-by-step explanation:
Length of rectangle = x+4
Width of rectangle = 12x
Perimeter = 26 cm
We need to find width of rectangle.
The formula used is:
Putting values and finding x first:
So, value of x is 0.7
Now width= 12x = 12(0.7)
=8.4 cm
So, width of rectangle is 8.4 cm.
Keywords: Perimeter of Rectangle
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Answer:
Step-by-step explanation:
First, we need to find the common denominator
The easiest way to do this is by multiplying the two given denominators, which are 2 and 5.
2 × 5 = 10
So, our common denominator is 10. Then, multiply the numerators of the two fractions by 2 and 5. Here's why:
=
We multiplied the top and bottom by 2 to make sure our new fraction stays equivalent to the original fraction.
Do the same thing for the other one:
=
Finally, subtract the two fractions to find the difference between the two times:
=
The reason we used the common denominator is because we can only add or subtract fractions if they have the same denominator.