1 yuanch msu Yuan Chien Peng A car is initially at rest on a straight road The histgram shows the car s acceleration along that road as a function of time Acceleration m s 2 Chien Peng Yuan PHY231 Spring 2015 Intro ss15phy231 Midterm 1 Keep this exam CLOSED until advised by the instructor 6 5 4 3 2 1 0 1 2 3 4 5 0 1 2 3 4 Time s Fill out the bubble sheet last name first initial and student number 5 50 minute long closed book exam A one sided 8 5 by 11 handwritten help sheet is allowed 4 pt Calculate the speed of the car at t 4 s in m s When done hand in your bubble sheet and your exam 1 A 4 B 5 C 6 D 7 E 8 F 9 G 10 H 11 6 7 Chien Peng Yuan PHY231 Spring 2015 Intro ss15phy231 Midterm 1 3 6 pt For the next three questions select the correct units from the following list A kg m s B kg m Two rocks are thrown from the top of a very tall tower One of them is thrown horizontally to the left with an initial velocity of vleft 16 6 m s The other rock is thrown horizontally to the right with an initial velocity of vright 13 8 m s See figure C kg s D kg s2 vleft E m s2 vright F m s G kg m2 s2 H kg m s2 I m kg s J The correct response is not shown above What is the SI unit for acceleration 2 A B C D F G H I E The SI unit of force is the Newton Which combination of units is dimensionally equivalent to the Newton 4 pt How far will the rocks be from each other after 4 60 s Neglect air resistance and assume that the rocks will not hit the ground within the time period in question in m 3 5 A B C D F G H I J E J What is the SI unit for velocity 4 A B C D F G H I E J A 5 45 101 B 6 38 101 C 7 46 101 D 8 73 101 E 1 02 102 F 1 20 102 G 2 H 2 1 40 10 1 64 10 Chien Peng Yuan PHY231 Spring 2015 Intro ss15phy231 Midterm 1 5 4 pt A boat crossing a 248 0 m wide river is directed so that it will cross the river and land on the opposite shore directly across from the starting point Two masses m1 3 82 kg and m2 5 18 kg are on a horizontal frictionless surface and they are connected together with a rope as shown in the figure m1 The boat has a speed of 5 80 m s in still water and the river flows uniformly at 3 10 m s Calculate the time required for the boat to reach the opposite shore in s 6 A 4 05 101 B 5 06 101 C 6 32 101 D 7 90 101 E 9 88 101 F 1 24 102 G 1 54 102 H 1 93 102 m2 F 2 pt The rope will snap if the tension in it exceeds 70 0 N What is the maximum value of the force F which can be applied in N 7 A 1 29 102 B 1 46 102 C 1 65 102 D 2 1 86 10 E 2 2 11 10 F 2 38 102 G 2 69 102 H 3 04 102 2 pt What is the acceleration of the whole system when this maximum force is applied in m s 2 8 A 1 14 101 B 1 34 101 C 1 57 101 D 1 83 101 E 2 14 101 F 2 51 101 G 1 H 1 2 93 10 3 43 10 Chien Peng Yuan PHY231 Spring 2015 Intro ss15phy231 Midterm 1 7 4 pt A box is lowered using a rope If the acceleration of the box is 7 m s2 downward and the tension in the rope is 52 N what is the mass of the box in kg 4 pt Your average speed on the first half of a car trip is 70 0 km h How fast do you have to drive on the second half of the trip to achieve an average speed of 88 0 km h for the whole trip in km h 9 A 1 99 B 2 89 C 4 19 D 6 07 E 8 80 F 12 76 G 18 51 H 26 83 10 A 1 18 102 B 1 39 102 C 1 62 102 D 1 90 102 E 2 22 102 F 2 60 102 G 3 04 102 H 3 56 102 Chien Peng Yuan PHY231 Spring 2015 Intro ss15phy231 Midterm 1 9 A fish is able to jump vertically out of the water with a speed of 5 58 m s 6 pt The position versus time graph below is a parabola and the positive direction is to the top of the page 3 pt What is the speed of the fish as it passes a point 0 47 m above the water in m s 11 A 1 534 B 1 917 C 2 397 D 2 996 E 3 745 F 4 681 G 5 852 H 7 315 3 pt How much time after leaving the water does it take for the fish to pass a point 0 47 m above the water while it is on its way down in s 12 A 0 559 B 0 654 C 0 765 D 0 895 E 1 047 F 1 225 G 1 433 H 1 677 Select the choice that most accurately describes each quantity during the motion depicted on the graph A always zero B zero at least once sometimes positive and sometimes negative C always negative D always positive E sometimes positive sometimes negative but never zero F zero at least once and sometimes positive G zero at least once and sometimes negative The speed is 13 A B F G C D E C D E C D E The velocity is 14 A B F G The acceleration is 15 A B F G Chien Peng Yuan PHY231 Spring 2015 Intro ss15phy231 Midterm 1 11 4 pt A boy standing on top of a building throws a small ball from a height of H1 20 1 m See figure 4 pt A 9 91 kg block is on an incline as shown in the diagram below and is observed moving DOWN the incline with constant velocity The angle of the incline is 25 41 with respect to the horizontal The ball leaves with a speed of 27 5 m s at an angle of 76 0 to the horizontal and lands on a building with a height H2 33 3 m Neglect air friction and calculate for how long the ball is in the air in s 16 …
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