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a 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 j. what is the height of the hillside? (formula: pe = mgh)
3.9 m
4.0 m
39.2 m
40.0 m

The correct answer is B. 4.0 m

The correct answer to the question is  4.0 m i.e the height of the hillside is 4.0 m.

CALCULATION:

As per the question, the mass of the dog is given as m = 40 kg.

The potential energy of the dog P.E = 1568 J.

Let the height of the hillside is h.

The potential energy possessed by the dog on the hillside is the gravitational potential energy which is the energy due to  its position from earth surface.

The potential energy of a body is calculated as -

                      Potential energy P.E = mgh.

Here, g is the acceleration due to gravity.

Hence, the height of the hillside is calculated as -

                                                  [ans]

Hence, the height of hillside is 4.0 m.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =