You are watching: During cooling, the kinetic energy of the molecules falls. why does this happen?

Because as soon as you cool somepoint dvery own, warmth energy is being released, so kinetic power of these molecules decreases because they have actually less energy stored in them

exactly how a lot force (in N) is exerted on one side of an 16.2 cm by 22.9 cm sheet of paper by the atmosphere

The 16.2cm by 22.9cm paper has an area = 370.98 square cm = 0.037098 square meters. And the atmospheric pressure at sea level is 101,325 Newloads per square meter. So if multiply the quantities: 101,325 N/m^2 and 0.037098 m^2 we acquire an lutz-heilmann.info of 3758.95 N.* If we respect the truth that 22.9cm and 16.2 cm only have 3 significant digits then our lutz-heilmann.info would certainly be 3760N.

Wo human being sit on a balanced seeobserved. as soon as one perboy leans towards the facility of the seeexperienced, that person"s end of the seesaw will

Go upwards(i.e Rise)This will be because of the Effects known as "Moments"The perkid that is relocating towards the centre will certainly distribute its weight towards the centre resulting in the end of the see observed to be lighter.

**HOPE IT HELPS**

A male sits through his back against the earlier of a chair, and he pushes a block of mass m = 6 kg straight forward on a table in fron

**(a) 23.8 J**

The work done by the man on the block is equal to the product in between the force used by the man (F=34 N) and the displacement of package (d=0.7 m):

**(b) 23.8 J**

According to the work-energy theorem, the kinetic power gained by the block is equal to the job-related done on it:

but given that the block began from remainder, its initial kinetic power was zero:

, so the final kinetic energy is sindicate equal to the occupational done:**(c) 2.8 m/s**

The final kinetic energy of the block is provided by:

wbelow m = 6 kg is the block"s mass and v is the last rate. Solving the equation for v, we find

**(d) 0.49 s**

The impulse is defined as the product between the force applied (F) and the moment taken (

), and also it is equal to the change in momentum of the block:where F = 34 N, m = 6 kg, and also

is the change in velocity of the block (the initial velocity was zero). Solving for , we find**(e) 0**

The male does not relocate, therefore the occupational done by the chair on the man is zero, because the displacement is zero: d = 0, so in the formula W = Fd, the outcome is zero.

**(f) -23.8 J**

According to the legislation of conservation of energy, energy cannot be produced nor ruined. Because of this, when the guy does job-related on the box, he need to spfinish some power, and the amount of this energy must be equal to the occupational done on the block. Due to the fact that the man has actually lost energy, we must likewise put an adverse sign, so the readjust in interior power of the male is -23.8 J.

**(g) 16 m/s**

The initial velocity of the block in the framework of referral of the train is zero:

Because the reference frame (the train) is relocating to the ideal at speed

then the initial velocity of the block need to be

**(h) 18.8 m/s**

The last velocity of the block in the framework of reference of the train is 2.8 m/s, calculated at step c)

Due to the fact that the referral frame (the train) is moving to the appropriate at speed

then the initial velocity of the block need to be

**(i) 768 J**

The initial kinetic energy of the block is provided by:

where m = 6 kg and also

. Substituting numbers, we find**(j) 1060.3 J**

The last kinetic power of the block is offered by:

wright here m = 6 kg and also

. Substituting numbers, we find**(k) 292.3 J**

The adjust in kinetic energy is offered by the difference between the kinetic power calculated at point (j) and also at suggest (i):

and also this is better than the same quantity in the man"s referral framework.

**(l) 8.52 m**

The full time of the motion is

(calculated at action d). The initial velocity of the block is and its acceleration is offered bySo we can calculate the displacement of the block by using

**(m) 289.7 J**

The work done by the man on the block in this reference structure is equal to the product in between the force on the block and the displacement:

The readjust in kinetic power of the block in this referral frame is

This is better than the exact same quantity in the man"s reference framework and also it matches the ΔK in this frame (the small distinction is simply because of the different rounding)

**(n) 7.84 m**

The chair simply relocated by unicreate activity along with the train, so its displacement is provided by

**(o) 0**

The chair and also the male are relocating together, so the chair is doing no occupational on the guy, therefore the work done by the chair is still zero.

See more: What Does It Mean To Blow Someone Off ? What Does To Blow Someone Off Mean

This is equal to the very same quantity in the man"s referral structure.

**(p) -289.7 J**

Due to the regulation of conservation of energy, the power shed by the male should be equal to the work-related he has done. Due to the fact that the job-related done by the male was 289.7 J, then the adjust in internal energy of the man have to be -289.7 J.