University:
Concordia University Wisconsin
Course:
PHYS 1514 | General Physics I
Academic year:

2022
Views:

170

Pages:

3
Author:

Accinkiquicpqw

Lesson 2 Practice Exercises PRACTICE EXERCISES Formula: p=m PP Note: Angles (directions) are expressed first in terms of north, east, etc., and also in terms of the rectangular coordinate system. 1. A 30.0 kg object moving to the right at a velocity of 1.00 m/s collides with a 20.0 kg object moving to the left at a velocity of 5.00 m/s. If the 20.0 kg object continues to move left at a velocity of 1.25 m/s, what is the velocity of the 30.0 kg blot Ims 020 361) +20(-5) 533 mv + mv object? 1.25m 2019 300(V) +20 (-1.25) mv + mv V=-1.5 m/s = 1.5m/s [W] 2. A 4.50×10 kg railway car is moving east at a velocity of 5.0 m/s on a level frictionless track when it collides with a stationary 6.50×10 kg railway car. If the two cars lock together upon collision, how fast are they moving after collision? S 450093 (4500) (5) + 6,500 11000g V=? 11000 V = V= 2.1 m/s [E] 3. A 925 kg car moving at a velocity of 18.0 m/s right collides with a stationary truck of unknown mass. The two vehicles lock together as a result of the collision and move off at a velocity of 6.50 m/s. What was the mass of the truck? Safter babove 925 18m/s 925+m 6.5m/2 = (925+m) (6.5m/s) Om/s (925X18) + 0 M=1636.5 = 1.64×10 4. A 50.0 g bullet strikes a 7.00 kg stationary wooden block. If the bullet becomes embedded in the block, and the block with the embedded bullet moves forward at a velocity of 5.00 m/s, what was the initial velocity of the bullet? 0.05 V 0.05 V 79 Omys 7.05 7.05(5) = V705m/s buspel 5. A 40.0 g object moving with a velocity of 9.00 m/s to the right collides with a 55.0 g object moving with a velocity of 6.00 m/s left. If the two objects stick together upon collision, what is the velocity to 71222 of the combined masses after collision? 0.04 0.055 9m/s 6m/s (0.04(9) +6.055)66) = 0.095kg V=7 0,095 V V=0.316 m [right] 231 MOMENTUM-Practice Exercises 6. A 76 kg student, standing at rest on a frictionless horizontal surface, throws a 0.20 kg object horizontally with a velocity of 22 m/s left. What was the initial velocity of the student upon release of the object? bebre 76.2円 0.2 22m5 lofter 76 109 V 0 = 76V + 0.2(-22) V= 0.058m/s [right] 7. A 25 kg projectile is fired horizontally from a 1.1×10 kg launcher. If the horizontal velocity of the projectile is 325 m/s cast, what is the recoil velocity of the launcher? 25kg+1,1x103 25 25 325/ 1.1×103 V=? V=-7.4 m 25(375) + 1.1×10 V 7.4 [W] 8. A rail vehicle with a rocket engine is being tested on a smooth horizontal track. Starting from rest, the engine is fired for a short period of time releasing 4.5x10 kg of gases. It is estimated that the average velocity of the gases is 1.4x10 m/s right, and that the maximum velocity of the vehicle is 45 m/s left. What is the mass of this vehicle? mtgas 45m/ 4.5×10 1.4x103m/s = ME45) + 4.5×10² (1.4×103) m=1.4x104kg 9. A 7.0 kg object at rest explodes into two parts. If part A has a mass of 2.0 kg and a velocity of 10.0 m/s right, what is the velocity of part B? 7kg Oms A 2kg 100% B5 V=T 2(10) + 5(V) V=-4m/s 4m/s [but] bume 10. A 1.02x10 kg truck moving at a velocity of 15 m/s north collides head on with a 1.02×10 kg car moving at a velocity of 25 m/s south. If they stick together upon impact, what is the velocity of the combined masses? 09223 15m/ 1.02x10 (15) 1,02*10+1.00 10% 19 V=? 1.02×10 by 25m/5 V= 11 + 1.020103(95) = (02×10+1.03×10) V 11m [North]✓

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