Atoms collide constantly, the spacing between molecules in the air is only about

Question

Atoms collide constantly, the spacing between molecules in the air is only about 70 nanometers, but a carbon dioxide molecule at room temperature has an average speed greater than the speed of sound! However, due to equation effects the energy of room temperature collisions are far to weak to transfer energy in the collision thus kinetic energy is conserved. What might we call these types of collision? A. Quantum: because of spin exclusion due to the exclusion principle B. because of the continuous flow with in the collision C. Relativistic: because the atoms are moving near the speed of light. D. Elastic: because both energy and momentum are conserved E. Inelastic: because momentum is conserved but energy is not. What is the total momentum, both angular and linear about the origin (0, 0) of two 5kg balls, one located at (-2, 2) and the other at (-2, 2), and both moving in the positive X direction with a speed of meters per second? A. P = 0 kgm/s, L = 100 kgm^2/s B. P = 50 kgm/s, L = 0 kgm^2/s C. P = 100 kgm/s, L = 0 kgm^2/s D. P = 0 kgm/s, L = 50 kgm^2/s E. P = 75 kgm/s, L = 75 kgm^2/s

Explanation / Answer

Q13.

energy is constantly being transferred from one molecule to other and it is conserved.

also momentum being in all the different directions, it is being conserved.

so option D is correct.

Q14.

let i,j and k are unit vectors along +ve x, +ve y and +ve z direction

then total linear momentum=5*(5 i)+5*(5 i)=50 i

so P=50 kg.m/s

angular momentum=cross product of r and P

where r is position vector
here sum of angular momentum=cross product of (-2,2,0) and (25 ,0,0) + cross product of (-2,-2,0) and (25 ,0,0)

=0

hence option B is correct.

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