When you drop a ball it accelerates downward at 9.8 m/s2. if you instead throw it downward, then its acceleration immediately after leaving your hand, assuming no air resistance, is
a. 9.8 m/s2.
b. more than 9.8 m/s2.
c. less than 9.8 m/s2.
d. cannot say, unless the speed of throw is given.

Acar is traveling at 53.0 mi/h on a horizontal highway. (a) if the coefficient of static friction between road and tires on a rainy day is 0.104, what is the minimum distance in which the car will stop?

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.

An object has a weight of 500 on earth what is the mass of this object