Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
Explanation:
Since electromagnetic waves do not require a medium to pass through, they are faster in matter that has fewer particles. ... ~ Sound cannot travel in a vacuum because mechanical waves, such as sound waves, require a medium to propagate through.
DE which is the differential equation represents the LRC series circuit where L d²q/dt² + Rdq/dt +I/Cq = E(t) = 150V. Initial condition is q(t) = 0 and i(0) =0. To find the charge q(t) by using Laplace transformation by Substituting known values for DE L×d²q/dt² +20 ×dq/dt + 1/0.005× q = 150 d²q/dt² +20dq/dt + 200q =150
The ball is rolling down with a negative velocity, but the velocity is slowing down. therefore the velocity must increase in order for the ball to slow down.
For example let the ball's initial velocity be -15 m/s. and it is slowing down to let's say -13 m/s. Well this means that it's velocity has increase by 2 m/s. So, its acceleration is positive.
