1. A baseball pitcher throws a fastball at a speed of 50.0 m/s. The acceleration occurs as the pitcher holds the ball in his hand and moves it through an almost straight-line distance of 4.2 m. Calculate the acceleration,
assuming it is uniform. Compare this acceleration to the acceleration due to gravity, 9.8 m/s?

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.

By definition a socially healthy person has access to clean water in adequate living space and makes an effort to recycle

An 800 kg car is moving at 32 m/s. what magnitude force is needed to bring that car to a stop in 30 seconds?