Answer:
90 feet
Explanation:
The farmer wants the second side of the garden to be 30 feet longer than the back of his house.
If the back of his house=x ft
The second side=(x+30) ft
Note that the farmer does not fence the side on the back of the house.
Area of the garden = 400 square feet
Area of a Rectangle= Length X Width
400 = x(x+30)
x+40=0 or x-10=0
x=-40 or x=10
Since length cannot be negative, x=10 ft
The Length of the Fencing the farmer will buy will be the perimeter of the three sides.
Perimeter of the three sides = x+(x+30)+(x+30)
=3x+60
=3(10)+60=90 ft
The farmer needs to buy a fencing of length 90 feet.
The answer is D i took the test but got it wrong but i got to see the answers
There are mistakes in the question.The correct question is here
A 2.0 kg, 20-cm-diameter turntable rotates at 100 rpm on frictionless bearings. Two 500 g blocks fall from above, hit the turntable simultaneously at opposite ends of a diameter, and stick. What is the turntable’s angular velocity, in rpm, just after this event?
Answer:
w=50 rpm
Explanation:
Given data
The mass turntable M=2kg
Diameter of the turntable d=20 cm=0.2 m
Angular velocity ω=100 rpm= 100×(2π/60) =10.47 rad/s
Two blocks Mass m=500 g=0.5 kg
To find
Turntable angular velocity
Solution
We can find the angular velocity of the turntable as follow
Lets consider turntable to be disk shape and the blocks to be small as compared to turntable
where I is moment of inertia
The density is about 3.88. You just have to divide the mass and the volume. You can check this on a calculator, too. Hope this helped
