# Physics

posted by .

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 17.0 kg child increase when the child climbs a normal staircase to the second floor?
J

• Physics -

It makes no difference of the staircase is spiral or "normal". What matters is the top to bottom elevation change.

The PE gain will be proportional to the person's mass.

Mulltiply 2.25*10^3 J by 17/81 (the mass ratio) and you will get the child's PE change

• Physics -

87

• Physics -

Grav PE of the adult = mgh = 2X10^3 J 81gh = 2X10^3 J gh = 2X10^3 / 81 Child's grav PE = mgh = 18 x 2x10^3 /81 = 444.4J

## Similar Questions

1. ### PHYSICS helppppp

A 0.2 kilogram baseball is thrown vertically downwards towards to the same horizontal floor. The baseball possesses an initial velocity of 30 meters per second. The height is 10.00m. (A) Calculate the POTENTIAL GRAVITATIONAL ENERGY …
2. ### Physics

what forms of energy are involved in the following situations?

4. ### College Physics

A 22.9-kg child is on a swing attached to ropes that are L = 1.33 m long. Take the zero of the gravitational potential energy to be at the position of the child when the ropes are horizontal. Part A)The child's gravitational potential …
5. ### physical sciebce

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 3000 j. by how much does the potential energy of an 22.0 kg child increase when the child climbs …
6. ### physical science

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 3000 j. by how much does the potential energy of an 22.0 kg child increase when the child climbs …
7. ### science

A ball sitting on the top of a table has potential energy but no kinetic energy. How do potential and kinetic energy change as the ball falls off the table to the floor?
8. ### science

A ball sitting on the top of a table has potential energy but no kinetic energy. How do potential and kinetic energy change as the ball falls off the table to the floor?
9. ### Physics

When an 81.6 kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.14E+3 J. By how much does the potential energy of a 18.6 kg child increase when the child climbs …
10. ### Physics

When an 84.7 kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.00E+3 J. By how much does the potential energy of a 17.3 kg child increase when the child climbs …

More Similar Questions