When a trebuchet counterweight is hoisted by soldiers, what form of energy is transferred into the machine as work?

Potential energy to kinetic energy

Explanation:

Potential energy is the form of energy possessed by a body due to its position.

Kinetic energy is the form of energy possessed by a body due to its motion.

When soldiers use their energy to hoist the trebuchet counterweight, the potential energy stored in the counter weight converts to kinetic energy of the counterweight as it is released and falls.

answer: 0.20

explanation: this can only be the answew because all the other measuremnets are not close

  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