77777 In this version the first answer is the correct one 10 problems have 3 versions So although your exam had 20 problems this answer key has 40 problems Make sure you compare with the numbers that you had in the exam Complete solutions are at the end of the document except for concept questions Instructor Biswas Ihas Whiting PHY 2053 77777 PHYSICS DEPARTMENT Exam 3 120 minutes Name print last first December 12 2009 Signature On my honor I have neither given nor received unauthorized aid on this examination DIRECTIONS 1 Code your test number THE 5 DIGIT NUMBER AT THE TOP OF EACH PAGE on your answer sheet using lines 76 80 Write your test number down and take it with you Code your name on your answer sheet Code your UFID number on your answer sheet 2 Print your name on this sheet and sign it also 3 You may do scratch work anywhere on this exam Circle your answers on the test form At the end of the test this exam printout is to be turned in No credit will be given without both answer sheet and printout 4 Fill in the circles of your intended answers completely on the answer sheet using a 2 pencil or blue or black ink Do not make any stray marks or some answers may be counted as incorrect 5 The answers are rounded o Choose the closest to exact There is no penalty for guessing 6 Hand in the answer sheet separately showing your UFID Useful information g 9 80 m s2 YAl 7 0 1010 Pa YCu 11 1010 Pa Neglect air resistance except when stated otherwise 1 m 3 281 ft water 1000 kg m3 G 6 67 10 11 Nm2 kg2 speed of light c 3 108 m s 1 A cart moving across a level surface accelerates uniformly at 1 0 m s2 for 2 0 seconds What additional information is required to determine the distance traveled by the cart during this 2 0 second interval 1 2 3 4 5 initial velocity of the cart net force acting on the cart coe cient of friction between the cart and the surface mass of the cart initial position of the cart 2 An arrow is shot through an apple If the 0 1 kg arrow changes speed by 10 m s during the collision from 30 m s to 20 m s and the apple goes from rest to a speed of 2 m s during the collision then what must be the mass of the apple 1 0 5 kg 2 0 2 kg 3 0 8 kg 4 1 0 kg 5 2 0 kg 3 An arrow is shot through an apple If the 0 1 kg arrow changes speed by 10 m s during the collision from 30 m s to 20 m s and the apple goes from rest to a speed of 1 m s during the collision then what must be the mass of the apple 1 1 0 kg 2 0 5 kg 3 0 2 kg 4 0 8 kg 5 2 0 kg 4 An arrow is shot through an apple If the 0 1 kg arrow changes speed by 10 m s during the collision from 30 m s to 20 m s and the apple goes from rest to a speed of 5 m s during the collision then what must be the mass of the apple 1 0 2 kg 2 0 5 kg 3 0 8 kg 4 1 0 kg 5 2 0 kg 5 Why does a scientist in the International Space Station experience weightlessness 1 2 3 4 5 She is in free fall along with the Space Station and its contents At an orbit of 200 miles above the Earth the gravitational force of the Earth on her is 2 less than on its surface In space she has no mass The gravitational pull of the Moon has canceled the pull of the Earth on her There is no gravitational force from the Earth acting on her 77777 77777 6 An object m on the end of a string moves in a circle on a horizontal frictionless table as shown in the figure As the string is pulled very slowly through a small hole in the table which of the following is correct for an observer measuring from the hole in the table 1 2 3 4 5 m The angular momentum of m remains constant The angular momentum of m decreases The kinetic energy of m remains constant The kinetic energy of m decreases None of these 7 A radio signal with a wavelength of 1 2 10 4 m is sent to a distance asteroid is reflected and returns to Earth 72 hours and 48 minutes later How far from Earth is the asteroid 1 3 9 1010 km 2 1 9 1010 km 3 7 9 1010 km 4 1 9 1011 km 5 2 9 1010 km 8 A radio signal with a wavelength of 1 6 10 4 m is sent to a distance asteroid is reflected and returns to Earth 35 hours and 12 minutes later How far from Earth is the asteroid 1 1 9 1010 km 2 3 9 1010 km 3 7 9 1010 km 4 1 9 1011 km 5 2 9 1010 km 9 A radio signal with a wavelength of 1 4 10 4 m is sent to a distance asteroid is reflected and returns to Earth 53 hours and 42 minutes later How far from Earth is the asteroid 1 2 9 1010 km 2 3 9 1010 km 3 1 9 1010 km 4 7 9 1010 km 5 1 9 1011 km 10 The best leaper in the animal kingdom is the puma which can jump to a height of 12 3 ft when leaving the ground at an angle of 37 With what speed must the animal leave the ground to reach that height 1 14 2 m s 2 46 5 m s 3 28 0 m s 4 8 55 m s 5 20 1 m s 11 Approximately how much would it cost to keep a 100 W light bulb lit continuously for 1 year at a rate of 0 10 kW hr 1 100 00 2 1 00 3 10 00 4 1 000 00 5 100 000 00 12 Approximately how much would it cost to keep a 60 W light bulb lit continuously for 2 5 months at a rate of 0 08 kW hr 1 10 00 2 1 00 3 100 00 4 1 000 00 5 100 000 00 13 Approximately how much would it cost to keep a 600 W light bulb lit continuously for 1 year at a rate of 0 16 kW hr 1 1 000 00 2 1 00 3 10 00 4 100 00 5 100 000 00 14 Which of the following could be a correct unit for pressure 1 kg m s2 2 kg m2 3 kg m s 4 kg s2 5 m s …