You have a long piece of aluminum wire, 10 m long and 1.0mm in diameter. the table below gives some characteristics of aluminum that may be useful for this problem; you may also wish to refer to the data tables. temperature coefficient of resistivity: 0.0039/"c density . molar mass: 2.7x10' kg/m 205 w/m/k 2.2x10- 9001/(kg k) 27.0 g/mol thermal conductivity: . magnetic susceptibility: .specific heat: (5 points) if the wire is at a normal room temperature of about 70'f, find the average thermal energy per atom and the ms speed of the atoms a. b. (4 points) find the current in the wire if it is connected across a 1.5 v ideal battery. (4 points) assuming that each aluminum atom has 3 free electrons, find the number density of free electrons (n) in the wire. c. (4 points) find the drift speed of the electrons when the wire is carrying the current found in part (b). how does this compare to the thermal speed from part (a)? you d.

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

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

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter