Asteel ball with mass 0.347 kg falls onto a hard floor and bounces. its speed just before hitting the floor is 23.6 m/s and its speed just after bouncing is 12.7 m/s.
(a) what is the magnitude of the impulse of the ball?
(b) if the ball is in contact with the floor for 0.0139s, what is the magnitude of the average force exerted onthe ball by the floor?

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.

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.

Debris produced by mining is called