Physics, 18.10.2019 21:30 xdaciax

List three cases in which potential energy becomes kinetic energy and three cases in which kinetic energy becomes potential energy.

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A) Potential energy converting into kinetic energy:
1- A ball in free fall from the top of a building: in this example, gravitational potential energy converts into kinetic energy
2- A compressed mass-spring which is released: the spring stretches and the mass is pushed away. In this example, elastic potential energy converts into kinetic energy
3- A positive test charge moving in the direction of the electric field generated by another positive charge: the charge moves from a point at higher potential to a point of lower potential, and electric potential energy converts into kinetic energy

B) Kinetic energy converting into potential energy:
1- A ball thrown vertically from the ground: the ball slows down, and the kinetic energy is converted into gravitational potential energy
2- A block sliding across a table that hits a spring, compressing it: the block slows down and its kinetic energy is converted into elastic potential energy of the spring
3- A positive test charge is fired towards another positive charge that produced an electric field: the charge moves from a point at lower potential to a point of higher potential, so it slows down and its kinetic energy is converted into electrical potential energy

Answer from: Quest

the grams of oxygen gas that can be produced is 20.6 grams of o₂

calculation

2liclo₃ → 2 licl + 3 o₂

step 1: find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5 +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281 moles

step 2: use the mole ratio to calculate the moles of o2

from equation above, liclo₃: o₂ is 2: 3

therefore the moles of o₂=0.4281 moles x3/2 =0.6422 moles

step 3: find mass of o₂

mass= moles x molar mass

from periodic table the molar mass of o₂ = 16 x2= 32 g/mol

mass=0.6422 moles x 32 g/mol = 20.6 grams of o₂

Answer from: Quest

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

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