This man is using a block and tackle to lift a heavy bale of cotton. the block and tackle contains which simple machine?

Calculate the frequency (in Hertz) of light with a wavelength of 420 nm. What color is the light?

Explain why the penguins of this species are considered carnivores

Consider the process where nA mol of gas A initially at 1 bar pressure mix with nB mol of gas B also at 1 bar form 1 mol of a uniform mixture of A and B at a final total pressure of 1 bar, and all at constant temperature T.

Which statement correctly describes the phosphate ion, PO 3/4

Which of the following is a reasonable ground-state electron configuration? 1s^21p^62s^22p^63s^2 1s^22s^22p^63s^23p^64s^24d^8 1s^22s^22p^63p^6 1s^22s^22p^63s^1

To what chemical reaction class does this reaction belong? 2 mg (s) + o2 (g) 2 mgo (s)

Which best illustrates how particle arrangement changes when solids change into liquids

Express in scientific notation (6.0x10^4) (3.1x10^-1)

How do you measure the mass of a liquid?

Given the following information, calculate the mass for B-11. B-10 has a natural abundance of 19.9 percent, while B-11 has a natural abundance of 80.1 percent. The mass of B-10 is 10.013 amu.