A person runs up 40 stairs and then come down 10 steps
So total stairs upwards is given as

now here we will have total height reached


Now total energy used or mechanical work done is


Now the mechanical power is given as


Answer:
do you mean how? if so
Explanation:people used newspapersand still kinda do back then they had posters up as they still do and newspapers
Answer:
The moment of inertia is 
Explanation:
The moment of inertia is equal:

If r is 
and 


Seafloor<span> spreading is when the </span>sea floor<span> spreads apart. This occurs at Divergent</span>Boundaries<span>. At which type of </span>boundary is seafloor destroyed<span>? The </span>seafloor<span> is</span>destroyed<span> at a COnvergent </span>Boundary<span>.</span>
Answer: y(t)= 1/π^2 sin(6*π^2*t)
Explanation: In order to solve this problem we have to consider the general expression for a harmonic movement given by:
y(t)= A*sin (ω*t +φo) where ω is the angular frequency. A is the amplitude.
The data are: ν= 3π; y(t=0)=0 and y'(0)=6.
Firstly we know that 2πν=ω then ω=6*π^2
Then, we have y(0)=0=A*sin (6*π^2*0+φo)= A sin (φo)=0 then φo=0
Besides y'(t)=6*π^2*A*cos (6*π^2*t)
y'(0)=6=6*π^2*A*cos (6*π^2*0)
6=6*π^2*A then A= 1/π^2
Finally the equation is:
y(t)= 1/π^2 sin(6*π^2*t)