Which of the following is an example of a pure substance?
A. a sample of oxygen gas
B. a solution of sugar water
c. a mixture of pasta and sauce
D. an alloy of iron and carbon

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?