Carl knows that water moves through different kinds of soil at different rates. how easily water moves through a soil is known as permeability. carl decides to compare the permeabilities of different soil types.

to do this, carl takes five identical flower pots with holes in the bottom and fills each one with different soil:
rocky, gravely dirt from the side of the road
potting soil from the store
clay soil from a nearby creek
sand from a store
dirt from his own backyard
carl pours one liter of water into each pot and measures how much water flows out of the bottom in one minute.

which of the following variables should be kept constant during this experiment?

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.

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.