Physics, 24.08.2019 11:30 daltonduh6218

An object of mass of 78 kilograms is lifted through a height of 6 meters. how much work is done?

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The potential energy of an object is

   (mass) x (gravity) x (height above something).

When the object rises to a greater height, its potential energy is greater.
If it didn't have rocket engines on it, then that extra energy had to from
outside, like from work done by whatever lifted it.

When the 78-kg object is lifted through 6 meters, its potential energy ...
above the place where it started ... is

   (mass) x (gravity) x (height) =

      (78kg) x (9.8m/s²) x (6 m) =

   4,586.4 kg-m²/sec² = 4,586 joules

That's the amount of work required to lift it to the new height.

Answer from: Quest

answer: the correct answer is air pressure at the top of mount everest is higher than at the bottom of the grand canyon.

hope this : )

explanation:

Answer from: Quest

1.the balanced chemical equation is as below

cu + 2 ag(no)₃ → cu(no₃)₂ +2 ag

2.the much silver produced is 50.9 g

step 1: find the moles of cu

moles = mass÷ molar mass

from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236 moles

step 2: use the mole ratio to determine the moles of ag

from equation above cu: ag is 1: 2

therefore the moles of ag =0.236 moles x 2/1 =0.472 moles

step 3: find the mass of ag

mass = moles x molar mass

from periodic table the molar mass of ag =107.87 g/mol

mass = 0.472 moles x 107.87 g/mol = 50.9 g

3. the much silver collected worth is 1.797 oz

convert 50.9 g to oz

that is 1 gram = 0.0353 oz

50.9 grams =? oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1 gram} =1.797 oz

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