Question

PHYSICS 30 MOMENTUM AND IMPULSE Q9 ASSIGNMENT A. MOMENTUM AND IMPULSE a. C. 1. Use the concept of Impulse to describe one advantage of seatbelts. 2. A 5.00 kg mass is moving with a velocity of 3.50 m/s. A force of 4.00 N acts on the object increasing its velocity (in the same direction) to 12.5 m/s. Determine Change in momentum b. Impulse the mass experiences Time interval that the force was applied for 3. A 15.0 kg object is moving at 8.50 m/s. A constant force then acts on the object for 2.25 seconds, bringing its final velocity to 3.75 m/s in the opposite direction. Calculate the impulse acting on the object What is the magnitude and direction of the force? c. What is the momentum of the object before and after the force acts? 4. Calculate the Impulse gravity applied to a 1.50 kg object as it fell 44.1 m starting from rest. a. b. B CONSERVATION OF MOMENTUM 1. An arrow with a mass of 115 g and a velocity of 50.0 m/s hits and sticks to a piece of wood of mass 2.10 kg. If the block of wood is on a frictionless, horizontal surface, with what velocity will the block move? 2. A 2.50 kg mass moving 7.50 m/s to the right collides head on with a 4.90 kg mass. After the collision the 2.50 kg mass is moving 5.00 m/s to the left and the 4.90 kg mass is moving 4.88 m/s to the right. a. Calculate the velocity of the 4.90 kg mass before the collision b. If the collision lasts for 0.0625 seconds calculate the force that acted on each mass during the collision. 3. An 8.00 kg shell initially moving at 28.8 m/s (East) explodes into 3 fragments. A 3.00 kg fragment flies directly north at 50.0 m/s and a 2.00 kg fragment flies directly east at 40.0 m/s. Calculate the velocity of the third fragment. 4. A 475 kg speedboat is racing 31.0 m/s [N 35 E) and crashes into a stationary 180 kg catamaran. After the collision the speedboat has a velocity of 18.0 m/s [N 67* E). Determine the final velocity of the catamaran. C. APPLICATION 1. Select a technology that applies the physics principles of momentum and impulse. (Ex: air bags, seatbelts, head rests, crumple zones in cars, design of median or side barriers on roadways, helmets and concussions, bungee jumping, golf, rocket propulsion, the karate chop, etc.) Use your knowledge of momentum and impulse to explain how the technology works in 1 to 2 paragraphs. CS Scanned with CamScanner

Answer 1

1 ) seat belt change momentum of women men gets less damage during Sudden break. So that 2 in a) change momentum sp=Pj-Pi Ap=(5)(12.5) - 5/3.50) = 45 kg. mpec Ampuise I. - I = Fot de = dp = 45kg. nkce X AZ dt c) time interval At - 1. ctis - 11.25 Jees. H 4 So, these are required some answers. C Scanned with CamScanner