As a circular metal disc is being heated, its diameter changes at a rate of 0. 01cm/min when the diameter is 5cm at what rate is the area of one side changing.

d.7.5cm is your answer

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

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.