The Russian satellite Sputnik 1, launched in 1957, was observed to take about 96 minutes to take a full revolution around the Earth. Its
average
distance from the center of Earth was calculated to be
approximately 7000 km, and can be considered to have moved in a
circular orbit. Calculate the orbital velocity of Sputnik

Auniform electric field exists in the region between two oppositely charged plane parallel plates separated by a distance of 1.60 cm . a proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval of 3.20×10-6 s. 1-find the magnitude of the electric field. use 1.60×10-19c for the magnitude of the charge on an electron and 1.67×10-27kg for the mass of a proton 2-find the speed of the proton when it strikes the negatively charged plate