El resorte en una máquina de Pinball tiene una constante de resorte (constante de resorte = k) de 120 [N/m]. La masa del pinball es 0.010 [kg]. La bola sale del émbolo con una
velocidad de 0.3 (m/s). Suponga que la energía se conserva totalmente, calcule la
compresión, x, del resorte.
EPER
KE = 1.my
= 1.kox?
Given:
KE = 4 • my
Formula:

Modify the equation fδt=δ (mv) to find the force of friction.

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.