Water has a specific heat of 4.186 j/g°c, and ethanol has a specific heat of 2.450 j/g°c. based on this information, which best compares water and ethanol?
it requires more heat to raise the temperature of a gram of ethanol by 1°c.
there are more molecules in a gram of water.
ethanol has a lower formula mass.
water has more protons and neutrons in its nuclei.

In a system, when potential energy decreases, then entropy also decreases. true false

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to.in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

Can anybody me with this? ? (picture included.)