# Physics

posted by .

6) If a flea has a mass of 2.0x10^2 micrograms jumps vertically to a height of 65mm and 75% of the energy comes from elastic potential energy stored in the protein, determine the initial quantity of elastic potential energy.

drwls said to use:
(1/2)M g H = (0.75)E where E is the potential energy stored in protein and H is the height that the flea can jump.

I don't understand how that would work. Also would you convert 2.0x10^2ug to kg?

• Physics -

He is right. The gravitational PE the flea gains is equal to .75 * the initial stored energy. BTW: energy stored in protein is chemical energy, not elastic.

Yes, convert grams to kg, and H to meters, and of course, g is 9.8m/s^2.

• Physics -

I got 8.4x10^-8. Is that right?

• Physics -

Energy=.5*200E-6*.065/.75

paste .5*200E-6*.065/.75 into the google search engine.

## Similar Questions

1. ### Physics

3) a) Calculate the unstretched length of a spring, which has a Hooke's constant of 40N/m and is 56cm long when supporting a stationary 800g object. I did mag = kx (0.800)(9.81) = 40x x = 0.20m l-x = u 56-20 = u u = 36cm Is that right?
2. ### physics

a spring with spring constant k= 100N/m is at its equilibrium length a) how much elastic potential energy is stored in the spring?
3. ### Physics

A spring with spring constant k=100 (N/m) is at its equilibrium length. a) How much elastic potential energy is stored in the spring?
4. ### Physics

what forms of energy are involved in the following situations?
5. ### physics

suppose a .3 kg mass on a spring that has been compress .1 m has elastic potential energy of 1 j. how much further must the spring be compressed to triple the elastic potential energy?

7. ### Physics

A thrill-seeking cat with mass 4.00 kg is attached by a harness to an ideal spring of negligible mass and oscillates vertically in SHM. The amplitude is 0.050 m, and at the highest point of the motion the spring has its natural unstretched …
8. ### physics

An elastic is stretched with an average force of 120.0 N a distance of 10.0 cm. The potential energy stored in the elastic is
9. ### Physics

Human feet and legs store elastic energy when walking or running. They are not nearly as efficient at doing so as kangaroo legs, but the effect is significant nonetheless. If not for the storage of elastic energy, a 70.0-kg man running …
10. ### Science (energy)

1. What similarities do nuclear energy and chemical energy share?

More Similar Questions