A picture of height 25mm is to be enlarged to a height of 1m by projecting it onto a screen which is 5m away from the projecting lens. Calculate, (I) the distance of the picture from the lens.
(II) the focal length of the lens

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented.b)scientists had not completely finalized their results, which took 30 years.c)cigarettes were cheaply available and media channels were very inefficient.d)cigarette manufacturers were trying hard to bring an alternative into the market

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.