Joan wants to determine whether rust forms on nails faster in alcohol or in water. she is limited on time and wants to speed up the reaction. what can joan do to increase the rate of reaction in her experiment?

a. decrease the surface area of the nails
b. increase the concentration of the alcohol
c. increase the number of nails that she is testing
d. decrease the temperature of the alcohol by adding ice

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

answer: strength i guess

explanation:

the answer is 12 as i may remember

: )