When you grind wheat to make flour, the flour comes out very warm--you can actually scorch the flour if you grind too quickly. Why does the temperature rise? Why does the temperature rise? A. The heat is transferred to the wheat while grinding.
B. The heat is released from the wheat in the process of grinding.
C. The work done by the wheat while grinding is converted to a rise in its thermal energy.
D. The work done on the wheat while grinding is converted to a rise in its thermal energy.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y

radial fractures in a piece of glass look most like which of the following?

a. spokes of a wheel

b. a circle

c. a zig zag

d. none of the above

the correct answer is a. spokes of a wheel

hope this (: