Block A is connected to Block B by a massless rope over a frictionless pulley. The surface of the incline has a coefficient of static friction, pls = 0.62, and a coefficient of kinetic friction, uk= 0.43. The angle of the incline 0 = 42°, the mass of A is 3.3 kg, and the mass of B is 5.4 kg.

(a) Draw the F. B.D. for every block. Use ruler
(b) Choose the positive x axis for every block
(c) Calculate the acceleration of the system
(d) Calculate the tension in the cords
(e) Calculate the value of the force of friction.
(f) What is the acceleration of the system?

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An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame