Answer:
true
Explanation:
Area = πr²
Differentiating in respect to r
we get,
dA/dr = 2πr
using chain rule,

since r = 4feet
so ,
2π(4) = 8π
When an earthquake strikes usually seismic waves carry the energy outward (a.) With the greatest power at the focus and as the seismic waves travel outward they become more and more weak until they disappear.<span />
To solve this problem we will use the concepts related to energy conservation. Both potential energy, such as rotational and linear kinetic energy, must be conserved, and the gain in kinetic energy must be proportional to the loss in potential energy and vice versa. This is mathematically


Where,
m = mass
v = Tangential Velocity
= Angular velocity
I = Moment of Inertia
g = Gravity
Replacing the value of Inertia in a Disk and rearranging to find h, we have



Replacing,


Therefore the height of the inclined plane is 5.6m
By using a tangent line.
I need a bit more info to be sure but that's not wrong.
Answer:
The acceleration of car is 6.67 m/s².
Explanation:
Given that,
Initial velocity = 30 m/s
Distance = 15 m
Final velocity = 10 m/s
Time = 3 sec
We need to calculate the acceleration
Using formula of acceleration




Negative sign shows the car is slowing down.
Hence, The acceleration of car is 6.67 m/s².