When paper burns, some of the chemical compounds in the
paper combine with oxygen in the air and become different
chemical compounds. That's a chemical change.
When iron rusts, or copper or silver turns green, that's the result
of the metal at the surface combining with the oxygen in the air and
forming a new chemical compound. Those are chemical changes.
When water evaporates, H₂O in the liquid phase gains thermal
energy and changes to H₂O in the gaseous phase. No chemical
compounds are lost, gained, or changed to other compounds.
It's just a physical change.
Answer:
F-F(gr) = ma
a= {F-F(gr)}/m =
=(15-10)/15=0.33 m/s² (upward)
Let’s say you’re hitting the golf ball with a golf club. Therefore, using the 3rd law to explain it... the golf ball will hit the club back. The reason why the ball moves, is because it can only sustain a certain amount of force.
Here’s another example:
https://physics.stackexchange.com/questions/150335/newtons-third-law-and-punching-a-glass-or-a-feather
Jill and her friends are using MOTIVATION AND REWARD SYSTEM. Motivation and reward system involves setting a specific goal that must be attained and rewarding oneself after attaining the goal. This system can be used to encourage oneself or another person to reach a certain goal, the reward which one will enjoys after attaining the goal serves to motivate one to attain the goal.
Answer:
Coffee at 38°C has higher kinetic energy than coffee at 34°C.
Explanation:
- Kinetic energy is directly dependent upon the temperature of the object. As the temperature increases the velocity of the particle increases too. This higher velocity causes the average kinetic energy to increase.
- So in the cup of coffee with temperature 38°, C has higher kinetic energy than the one with 34°C.
- In the case of 0.25 L of tea, it has the highest temperature i.e. 43°C but the mass is less than coffee. According to relation, E= m
, the higher mass has higher energy. The particle with higher kinetic energy has higher mass because the fast-moving particle weighs more.
