How many "big c" calories does it take to raise the temperature of 2.00 l of water from 22.0 c to 40.0 c?

given that

mass of water = 2 L = 2000 gram

now we can use

heat required to raise the temperature

C = 1 cal/g C

now from above formula

so above is the heat required to raise the temperature

they start with the same

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.