PHY 138 - Midterm 2 [SUMMER I 2008]

PHY 138 Midterm 2 - Summer 1 Ensign 10M X'9 A handgun fires a 0.015 kg bullet with a speed of 450 m/s What is the kinetic energy of the bullet

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Unformatted text preview: Summer 1: Ensign ' 10M X '9» A handgun fires a 0.015 kg bullet with a speed of 450 m/s. What is the kinetic energy of the bullet after it emerged from the handgun? i _ a 3 A 106 kg train accelerates from rest to 25 mls over a distance of 2000 m. What is the average force acting on the train during this period? :— l A 100 kg sign hangs from the end of a 10 rn icing horizontal poie. The poie is Supported l 4 l by a cable that is at an angle of 25° with respect to the horizontal. What is the tension In ! whit—d». mi 5 A 1.53 kg object has two forces acting on it, The first force is 129 N at an angle of 45' with respect to the mantis. Th second force is 120 N at an l angie of 315° with respect to the xv-axis, karat is the acceleration of the ‘1 object? ' “AH... M ed from a 10.0 m tower. When it strikes the ground it makes no cm deep. Assuming that the force of the floor on the ball the ball when is makes the dent in the floor? A 123 kg steal ball is drapp a dent in the floor that is 1. is constant, what is the farce acting on {Hint use the Work-Energy Theorem.) 7 A rocket is setting on the iaunch pad burning fuel until its thrust exactly matches the weight of the vehicle. If the mass of the vehicle at Iiiboff is 3.04 x 10‘ kg, what is the upward thrust Supplied by the engine? ..___,__: ! 8 I A rope is stretched tightly betwsren two poles that are separated by 10.0 m. ifa 20 N force moves the center of the rape by 0.39 m in the trahsverse direction, determine the tension of the rope- i 1 9 A handgun fires a 0.015 kg bullet with a speed (#450 mis. The work done by the a expanding gas IS 4,500 3. How much energy was lost to friction during the cycie? i 10 1 A 10GB kg object is resting can an asteroid where the acceleration of gravity is 0.35 misz. i What isthe weight ofthe object on the asteroid? . W, l.. _____ 11 ‘ A 0.010 kg buiiet is moving at 500 mjs when it strikes a baie of cotton and comes to a i cemplete stop. If the builet penetrates 1.5 m into the bale, what is the average force the i hate exerts on the buttet as it cemes to a comptete stop? __._.M..,,.,.. .—.._._-___M I! - - 2 12 ‘ A 63 kg woman is standing in an elevator that us acceieratmg dcwnwa-rds at 9.35 m/s . i What is the upwards force that the elevator exerts on the woman? 5. i i at for air resistance was that the retarding force was given by R = mbv 13 l Newton's mad . ' 1 't { umbrium veiocity} ’ . - x It the terminai VB cc: v e i where b *5 5‘ w“5‘a“‘?“d."“‘“e Vfic‘wwar : 1’ rs. min: a!” b 3'” i, i Dfa 103 kg falling 013363 *5 15 I 1. 7 _ r »- - * ---—- -- I: 7 . ".mte 1:,, __.v _ r - W —" _ __r. _ i it 1:: ‘ What is the potentiai energy of an 30 kg man who is 113.6 m above the ground‘ [ 1 E t cause this acceieration? (m 1. [909 7, _.e_ jg) 7 fl _ T t 15 ' A rope is being used to haut a 500 kg crate to the top of a building. If the crate is rising at a constant Speed, what is the tension in the rope. '- r.,__ 1",, ._ k 15 N A car accelerates from 50 mifhr to 7G mijhr. How much work was done to the car to i, ..,, _. ,, i L " a = rocket? [i r [17 1 A 125 kg rocket accelerates at 30 mls2 horizentaliy. What is the net force acting an the ! t A 1000 kg car experiences a met {one of 106 N. How Jung will it take the car to reach 3 ‘ g 19 i What force wouid need to be added to the system shown beiew to bring the system into g 1 equilibrium? 1 a i l i E 2 , I 20 ‘ An object has a 123 N fotce acting on it. If it acceieretes at 3.14 mjs ,what IS the mass of g_ a the obiect? . ...
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This note was uploaded on 07/09/2008 for the course PHY 138 taught by Professor Meitzler during the Summer '08 term at Sam Houston State University.

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PHY 138 Midterm 2 - Summer 1 Ensign 10M X'9 A handgun fires a 0.015 kg bullet with a speed of 450 m/s What is the kinetic energy of the bullet

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