<span>In chemical reaction, atoms
always are rearranged. They are never destroyed or created because it would
contradict the law of conservation of energy. The law of conservation of energy
states that energy can neither be created nor destroyed, but can change from
one form to another. Also it cannot be neutralized. Resulting in one cannot be
part of a chemical reaction. An example of this is the reaction HCl + NaOH
-> NaCl + H2O. the reactants and products are not created, they are just
formed into another substance.</span>
Answer:
hence option A is correct
Explanation:
heat required from -9°C to 0°C ice = mass × specific heat of ice ×change in temperature
heat required from -9°C to 0°C ice = 7×2100×9 =132300 J =0.1323 MJ
( HERE SPECIFIC HEAT OF ICE IS A CONSTANT VALUE OF 2100
J/(kg °C )
heat required from 0°C ice to 0°C water = mass× specific heat of fusion of ice
= 7×3.36×10^5
= 2.352 × 10^6 J
= 2.352 MJ
TOTAL HEAT ENERGY REQUIRED = 0.1323 MJ +2.352 MJ
= 2.4843 MJ
hence option A is correct
the input force is either by hand or electric power. The output force is the the metal at the top of the can being removed and the movement around the can opener
<span>Throwing the bowling ball would have the greatest negative velocity becasue Principle of the Conservation of Momentum states that: if objects collide, the total momentum before the collision is the same as the total momentum after the collision (provided that no external forces - for example, friction - act on the system). That’s amazingly useful because it means that you can tell what is going to happen after a collision before it has taken place. Principle of Conservation of Energy: Of course, energy is also conserved in any collision, but it isn't always conserved in the form of kinetic energy.</span>