Paul Hewitt says that the new concepts that we about to learn in electricity are similar to which concepts that we have already studied before?

Electrostatic

Explanation: the concept in electricity is very similar to that of Electrostatic.

Electrostatic means static electricity. They both have concepts of charges. ( like charges and unlike charges)

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle