Answer:vs=5mph , vk=7+vs=12mph
Explanation: kinematics with constant speed
(shaun) xs = 0 + vs*t
(keegan) xk= 68 - vk*t
they meet after t= 4hours (xs=xk):
vs*t= 68-vk*t
but we know that vk=7+vs ( keegan faster) replacing:
vs*4= 68-(7+vs)*4
solving vs=5mph , vk=7+vs=12mph
<span>A wave with a large amplitude has a lot of a.vibration b.speed <u> c.energy</u></span>
<span>The reason that the balloon will stick to the wall is because the negative charges in the balloon will make the electrons in the wall move to the other side of their atoms and this leaves the surface of the wall positively charged.</span>
Answer:
Explanation:
Take at look to the picture I attached you, using Kirchhoff's current law we get:
This is a separable first order differential equation, let's solve it step by step:
Express the equation this way:
integrate both sides, the left side will be integrated from an initial voltage v to a final voltage V, and the right side from an initial time 0 to a final time t:
Evaluating the integrals:
natural logarithm to both sides in order to isolate V:
Where the term RC is called time constant and is given by: