A stream of gas consists of n molecules. Each molecule has mass m and speed v. The stream is reflected elastically from a rigid surface as shown. The magnitude of the change in the total momentum of the stream is:
A) 2mnv
B) 2mnv sin 30 °
C) mnv sin 30 °
D) mnv cos 30 °
E) mnv

Question

A stream of gas consists of n molecules. Each molecule has mass m and speed v. The stream is reflected elastically from a rigid surface as shown. The magnitude of the change in the total momentum of the stream is: 
A) 2mnv 
B) 2mnv sin 30 ° 
C) mnv sin 30 ° 
D) mnv cos 30 ° 
E) mnv

Quizplus · Accepted Answer

The Answer of A stream of gas consists of n molecules. Each molecule has mass m and speed v. The stream is reflected elastically from a rigid surface as shown. The magnitude of the change in the total momentum of the stream is: 
A) 2mnv 
B) 2mnv sin 30 ° 
C) mnv sin 30 ° 
D) mnv cos 30 ° 
E) mnv

A Stream of Gas Consists of N Molecules