The mechanical advantage of a wheel and axle is the radius of the wheel divided by radius of the wheel divided by the radius of the axle a, the wheel and axle are very close in size. on wheel b the radius of the wheel is much greater then the radius of the axle. which wheel and axle has the greater mechanical advantage?

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i