Rwo identical negatively charged spheres. A and B. having charges of the same nagnitude, are placed 0,5 m apart in vacuum. The magnitude of the electrostatic force
hat one sphere exerts on the other is 1,44 x 10'N
0.5 m
$100
B.
А
State Coulomb's law in words.
2.1
2.2
Calculate the:
2.2.1
O
Magnitude of the charge on each sphere
Excess number of electrons on sphere B
2.2.2​

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

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

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?