Answer:

Pressure exerted on the wall is 8775 kgm/s²

Explanation:

Parameters given:

Time = 1s

Number of molecules: 5*10²³

Area: 8cm² = 8*0.0001 = 0.0008m²

Speed of molecules: 300m/s

Mass of N₂ molecule: 4.68 x 10⁻²⁶ kg

Pressure = Force/Area

Total pressure of N molecules will be:

Pressure = Force*Number of molecules/Area

Force is given as:

Force= mass*acceleration

And acceleration is:

Acceleration = velocity/time

Therefore,

Force = (mass*velocity)/time

Pressure = (mass*N*velocity)/(Area*time)

Pressure = (4.68 x 10⁻²⁶*5*10²³*300)/(0.0008*1)

Pressure = 7.02/0.0008

Pressure = 8775 kgm/s²

**Answer:**

proton and neutrons

**Explanation:**

electron has negligible mass

**Answer:**

KE = 1/2mv^2

KE = 1/2(1120)(40^2)

KE = 560(1600)

**KE = 896000**

Let me know if this helps!

Answer:

A simple machine having a velocity ratio of 3 simply means that the ratio of the distance moved by effort to the distance moved by load is equal to 3.

Explanation:

A simple machine can be defined as a type of machine with no moving parts but can be used to perform work.

Basically, a simple machine allows for the transformation of energy into work. The six simple machines are;

I. Inclined plane.

II. Screw.

III. Wheel and axle.

IV. Lever.

V. Wedge.

VI. Pulley.

Mathematically, the velocity ratio of a simple machine is given by the formula;

Hence, a simple machine having a velocity ratio of 3 simply means that the ratio of the distance moved by effort to the distance moved by load is equal to 3.

The following equations show how kinetic energy (KE), potential energy (PE), and total mechanical energy (ME) are solved.

KE = 0.5mv²

PE = mgh

ME = PE + KE

where m is mass, v is speed/velocity, g is gravitational constant, and h is height.

Substituting for number 1,

KE = 0.5(2000 kg)(30 m/s)² 900,000 J

PE = (2000 kg)(9.8 m/s²)(0 m) = 0

ME = 900,000 J

I believe you will be able to answer the rest of the items following the same principles as presented above.