Which of the following quantities is a vector? a. velocity.
b. mass.
c. speed.
d. time.

Ingrid wrote the hypothesis below. if the temperature of a liquid increases, the density of the liquid decreases because the particles move farther apart. what are the variables in her hypothesis?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical