If the normal force exerted on an object increases, the coefficient of sliding friction will also increase. true false

FALSE

Explanation:

As we know that the friction force between two sliding surfaces is given by the formula

here

= coefficient of friction

it depends on the the inter molecular force between the molecules of the two surfaces which slide over each other

now if we will increase the normal force then it will increase the force of friction

but if will not change the value of coefficient of friction between two surface as it is property of the surface only

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

i believe the answer would be:

d. violin, clarinet, french horn, and tuba