Answer:
v ≈ 8.5 km/h
Step-by-step explanation:
Since the diameter of the wheel is 3 m the radius will be r = 1.5 m.
Use the radius of the water wheel to find it's circumference C:
[set r = 1.5 m]
⇒ 
⇒ 
m
One revolution of the water wheel corresponds to 
meters so the angular velocity 15 rmp (revolutions per minute) corresponds to:
= 
/min
Using this result, the speed of the river in kilometers per hour will be:
× 
× 
⇒ 
⇒ 
≈ 
km/h
Answer:
1/9^15
Step-by-step explanation:
Answer:
21y^2+11.2
Step-by-step explanation:
4-3y(-7y)+7.2
combine like terms
-3y (-7y) = 21y^2
add 4 to 7.2
11.2
21y^2 + 11.2
On evaluating the solution is 32
Step-by-step explanation:
- Step 1: Use the PEMDAS principle to solve the expression.
⇒ 12 (3 + 2²)/2 - 10 = 12 (3 + 4)/2 - 10
= 12 × 7/2 - 10
= 84/2 - 10
= 42 - 10 = 32
