Read the text about a person in motion. Percy was riding his bike along a flat road. When he saw a hill ahead, he began
pedaling faster. To start climbing the hill, he switched his bike into a lower gear.
The ride was difficult, so he stopped to catch his breath at the top of the hill.
When was the most gravitational potential energy stored between Percy and Earth? Assume
that Percy's mass did not change.
when he saw the hill and started pedaling faster
when he switched into a lower gear so he could climb
the hill
when he stopped to catch his breath

If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance. what is its vertical displacement (in m) after 6 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.

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?