*no mass was given*
2.
suppose two ball bearings are initially a horizontal distance 20 m apart while 400 m above the surface
of moon. by how much does the separation between them decrease as they fall 400 m to the surface?
(this decrease would be attributed, classically, to a “fictitious force” that pushes the particles together.
a fictitious force is often called a “tidal force” in the context of motion in a gravitational field.) if you
could measure separations to an accuracy of 1 mm during the fall, or if your experiment requires that
the change of separation remains < 1 mm, is such a freely-falling frame inertial?

The mass of a muon is 207 times the electron mass; the average lifetime of muons at rest is 2.21 μs. in a certain experiment, muons moving through a laboratory are measured to have an average lifetime of 7.04 μs. for the moving muons, what are (a) β (b) k, and (c) p? the rest energy of the electron is 0.511 mev.

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.

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.