When an 81.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.25 103 j. by how much does the potential energy of a(n) 17.5-kg child increase when the child climbs a normal staircase to the second floor?

Assuming both staircases are of equal height from the ground floor, then the nature of the staircase does not change the gravitational potential energy.

We can, from information given, find the height of the floor, and then apply to the child using the standard formula, E=mgh.

However, in this case, it is a matter of proportions, i.e.

81.0 kg : 2.25 kJ

17.5 kg : x kJ

cross multiply to get

x=2.25*17.5/81=0.486 kJ (or 486 J) to three significant figures.

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50

the answer is b

explanation: