A 2.0 kg ball is dropped from a height of 20 m onto a soft surface and rebounds to a height of 5.0 m . What is the magnitude of the impulse exerted on the ball by the floor? A: 10 NS
B: 20 NS
C: 40 NS
D: 60NS
E: 100 NS

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

In 1980, alfa romeo introduced the first system to smooth a rough idle caused by ignition and camshaft timing changes.

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.