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1 WebAssign Ch. 9 Momentum - Physics (Homework) Due : Wednesday, October :00 PM MDT }.1 Current Score : / 40 ISAAC PARKER Physics, section T1_P5_C arlson, Instructor: Sarah C arlson The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Important! Before you view the answer key, decide whether or not you plan to request an extension. Your Instructor may not grant you an extension if you have viewed the answer key. Automatic extensions are not granted if you have viewed the answer key. Request Extension /2.36 points Previous Answers GPhys09 9.AC.046. Is it possible for an object to obtain a larger impulse from a smaller force than it does from a larger force? Yes No Explain A smaller force over a longer period of time will create a larger force than a large force over a quite small amount of time. 20N*30s=600N/s, while 400N*1s=400N/s Key: If the smaller force acts for a long enough time, it can provide a larger impulse /2.36 points Previous Answers GPhys09 9.AC.047. You are sitting at a baseball game when a foul ball comes in your direction. You prepare to catch it barehanded. To catch it safely, should you move your hands toward the ball, hold them still, or move them in the same direction as the moving ball? You should move them towards the ball. You should hold them still. You should move them in the same dir!û Explain. Moving your hand(s) in the same direction as the ball will make it so that the difference in force

2 between your hand(s) and the ball is less, thus putting you in control of the ball and letting the force less painfully transfer to your hand and stop the ball. Key: You should move your hands in the same direction the ball is traveling to increase the time of the collision, reducing the force /2.35 points Previous Answers GPhys09 9.AC.050. During a space walk, the tether connecting an astronaut to the spaceship breaks. Using a gas pistol, the astronaut manages to get back to the ship. Use the language of the impulse-momentum theorem and a diagram to explain why this method was effective. This method was effective because momentum is mass times velocity. Velocity is speed with direction. The impulse from the gas pistol force because the masses are very different, there is no friction to speak, so it's easier for the high velocity of the "kickback" of the gun (with small mass) to be converted to a more manageable velocity for the astronaut because the astronaut is much more massive. Key: When the gas pistol is fired in the opposite direction, it provides the impulse needed to move the astronaut toward the capsule /2.36 points Previous Answers GPhys09 9.MC.033. Can a bullet have the same momentum as a truck? Yes No Explain. A bullet's mass compared to a truck's mass is very tiny, but it's velocity is incredibly higher. The trucks mass is large but the velocity could be low. i.e. a.25kg 1,000 m/s would have the same momentum as a 2000kg (okay so funky numbers but it's possible) Key: In order for a bullet to have the same momentum as a truck, it must have a higher velocity because the two masses are not the same. m bullet V bullet = M truck v truck /2.36 points Previous Answers GPhys09 9.MC.034. A pitcher throws a curve ball to the catcher. Assume that the speed of the ball doesn't change in

3 flight. (a) Which player exerts the larger impulse on the ball? The pitcher exerts a larger impulse on the ball. The pitcher and catcher exert the same impulse on the ball. The catcher exerts a larger impulse on the ball. (b) Which player exerts the larger force on the ball? The pitcher and catcher exert the same force on the ball. The catcher exerts the larger force on the ball. The pitcher exerts the larger force on the ball /2.35 points Previous Answers GPhys09 9.MP.062. A hockey player makes a slap shot, exerting a constant force of 29.4 N on the hockey puck for 0.14 s. What is the magnitude of the impulse given to the puck? N s /2.35 points Previous Answers GPhys09 9.MP.064. A hockey puck has a mass of kg and is at rest. A hockey player makes a shot, exerting a constant force of 28.0 N on the puck for 0.16 s. With what speed does it head toward the goal? m/s /2.35 points Previous Answers GPhys09 9.MP.065. Before a collision, a 22 kg object is moving at +13 m/s. Find the impulse that acted on the object if, after the collision, it moved at the following velocities. (a) +8.0 m/s N s (b) -8.0 m/s N s /2.35 points Previous Answers GPhys09 9.MP.080. A 2586-kg van runs into the back of a 823-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.

4 m/s /2.35 points Previous Answers GPhys09 9.MP.082. A kg

5 up the snowmobile from 6.00 m/s to 24.0 m/s over a time interval of 60.0 s. (a) Sketch the event, showing the initial and final situations. (Do this on paper. Your instructor may ask you to turn in this work.) Key: paper submission (b) What is the snowmobile's change in momentum? 4680 kg m/s What is the impulse on the snowmobile? 4680 N s (c) What is the magnitude of the average force that is exerted on the snowmobile? 78 N 14. /2.35 points GPhys09 9.PP.005. A 2200-kg sport utility vehicle traveling at 96 km/h can be stopped in 0.17 s if it hits a concrete wall. Assume a 60 kg person was in the car that hit this wall. The velocity of the person equals that of the car both before and after the crash, and the velocity changes in 0.17 s. (a) What is the average force exerted on the person? 9410 N (in a direction opposite to the initial motion) (b) Some people think that they can stop themselves rushing forward by putting their hands on the dashboard. Find the mass of the object that has a weight equal to the force you just calculated. 960 kg Could you lift such a mass? Are you strong enough to stop yourself with your arms? Key: Such a mass would be too heavy to lift. You cannot safely stop yourself with your arms /2.35 points Previous Answers GPhys09 9.PP.013. Two freight cars, each with a mass of kg, collide and stick together. One was initially moving at 3.4 m/s and the other was at rest. What is their final speed? m/s /2.35 points Previous Answers GPhys09 9.PP.014. A kg hockey puck moving at 22 m/s is caught and held by a 79-kg goalie at rest. With what

6 speed does the goalie slide on the ice? m/s 17.0/2.4 points Previous Answers GPhys09 9.PP.015. A 35.0-g bullet strikes a 5.2-kg stationary piece of lumber and embeds itself in the wood. The piece of lumber and bullet fly off together at 8.0 m/s. What was the original speed of the bullet? m/s

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