Question

Review | Constants | Peri Friends throw snowballs at the wall of a 3.0 m x 6.0 m barn. The snowballs have mass 0.10 kg and hit the wall moving at an average speed of 6.0 m/s Part A They do not rebound. Determine the average pressure exerted by the snowballs on the wall if 50 snowballs hit the wall each second. Express your answer with the appropriate units. ? НА Value Units Р- The unit you entered is not recognized. Review a list of acceptable units No credit lost. Try again. Submit Previous Answers Request Answer

Answer 1

Area3m 6 m m 0.1 V 6 m 50 Anowtaus acono Fx 4t m x AV when t- 1sec F= m x AV 3o N 11 2 .66 Nm P = F A 1 3 x 6

Answer 2

SOLUTION :

Each second 50 snowballs of mass 0.1 kg each, hit the wall of area 3.0 m x 6.0 m at a speed of 6.0 m/sec. Snowballs do not rebound.

Momentum of 50 snowballs just before hitting the wall 

= 50 * 0.1 * 6.0 

= 30 kg.m/sec 

As snowballs do not rebound, the speed of snowballs after hitting the wall = 0 m/sec .

So change of momentum = 30 - 0 = 30 kg.m/sec = 30 N/sec

This results into impulse on the wall = F * t 

Change of momentum in 1 second = Impulse created during 1 sec 

=> 30 * 1 = F * 1 

So, F = 30 N 

Pressure = F/A = 30 / (3 * 6) = 5/3 = 1.667 N/m^2 = 1.667 Pascals.

Pressure on the wall is 1.667 pascals. (ANSWER).