PHY101 Online Summer 2015 UB Physics Instructor Dr Hong Luo Student Name PRINT Last First ID or SSN Signature 2 hours duration 1 pm 3 00 pm Eastern Time Students are allowed a calculator and ONE 8 5 x11 sheet of paper with whatever you wish written on it both sides No cellphone calculators Clearly circle the letter of your choice No points will be given if two or more choices are circled or for partial marking Each problem is worth 3 points for a total of 90 points for this exam Please note that giving or receiving aid on an exam or any act of academic dishonesty is cause for dismissal from the University You must put all your final answers a b c or d in the table below to receive full credit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 Suppose an equation relating position x to time t is given by x b t 3 c t4 where b and c are constants The dimensions of b and c are respectively a T3 T4 b 1 T3 1 T4 c L T3 L T4 1 d L2 T3 L2 T4 2 The distance to the Andromeda Galaxy is estimated at about 2 10 6 light years A light year is the distance traveled by light in one year if the speed of light is 3 10 8 m s about how far is it from our galaxy to Andromeda 1 year 3 15 107 s a 10 1015 m b 1 1018 m c 2 1022 m d 6 1012 m 3 Water flows into a swimming pool at the rate of 8 0 gal min The pool is 16 ft wide 32 ft long and 8 0 ft deep How long does it take to fill 1 U S gallon 231 cubic inches a 32 hours b 64 hours c 48 hours d 24 hours 4 If point A is located at coordinates 5 3 and point B is located at coordinates 3 9 what is the distance from A to B if the units of the coordinated system are meters a 14 m 5 b 10 m c 8 m d 17 m A train slowly climbs a 500 m mountain track which is at an angle of 10 0 with respect to the horizontal How much altitude does it gain a 86 8 m b 88 2 m c 341 m d 492 m 6 Which point is nearest the x axis a 3 4 b 4 5 c 5 3 d 5 2 7 On planet Z the standard unit of length is the foose Ann the Astronaut is 5 90 feet tall on earth She lands on planet Z and is measured to be 94 foosi tall Her partner Rachael is 88 foosi tall How tall is Rachael on Earth a 5 2 feet b 5 5 feet c 5 8 feet d 6 3 feet c Acceleration d Displacement 8 Which of the following is not a vector quantity a Temperature b Velocity 2 9 A velocity versus time graph is drawn for a ball moving in one direction The graph starts at the origin and at t 5 seconds the acceleration of the ball is zero We know that at t 5 s that a The slope of curve is non zero c The curve is not crossing the time axis b The velocity of the ball is not changing d The curve is at v 0 t 0 10 Two objects with different masses are released simultaneously from the top of a 20 m tower and fall to the ground If air resistance is negligible which statement applies best a The greater mass hits the ground first c The smaller mass hits the ground first b Both objects hit the ground together d None of the above answers 11 A baseball catcher throws a ball vertically upward and catches it in the same spot when it returns to him At what point in the ball s path does it experience zero velocity and non zero acceleration at the same time a Midway on the way up b At the top of its trajectory c The instant it leaves the catchers hands d The instant before it arrives in the catchers hands 12 In which of the following cases is the displacement s magnitude half the distance travelled a 10 steps east followed by 3 steps west c 5 steps east followed by 10 steps west b 22 steps east followed by 11 steps west d 15 steps easy followed by 5 steps west 13 A cart is given an initial velocity of 5 0 m s and experiences of a constant acceleration of 2 0 m s What is the magnitude of the carts displacement in first 6 0 s of its motion a 10 m b 55 m c 66 m d 80 m 14 An automobile driver puts on the brakes and decelerates from 30 m s to zero in 10 s what distance does the car travel a 150 m b 196 m c 336 m d 392 m 15 A taxicab moves five blocks due north five blocks due east and another two blocks due north Assume all blocks are of equal size What is the magnitude of the taxi s displacement start to finish a 12 blocks b 9 8 blocks c 9 2 blocks 3 d 8 6 blocks 16 A string attached to an airborne kite is maintained at an angle of 40 with the horizontal If a total of 120 m of string is reeled in while bringing the kite back to the ground what is the horizontal displacement of the kite in the process Assume the kite string doesn t sag a 100 m b 84 m c 77 m d 92 m b 17 A jogger runs halfway around a circular path with a radius of 60 m What respectively are the magnitude of the displacement and the distance jogged a 60 m 188 m b 120 m 188 m c 0 m 377 m d 120 m 377 m 18 A baseball thrown from the outfield is released from shoulder height at an initial velocity of 29 4 m s at an initial angle of 30 0 with respect to the horizontal If it is in its trajectory for a total of 3 00 s before being caught by the third baseman at an equal shoulder height level what is the ball s net vertical displacement during its 3 s trajectory a 11 0 m b 9 80 m c 22 1 m d Zero 19 A projectile is thrown horizontally at 10 0 m s The projectile hits the ground 0 510 s later What is the angle of impact the projectile makes with the horizontal ground a 30 0 degrees b 26 6 degrees c 27 0 degrees d 60 degrees 20 Vectors A B and C have magnitudes 6 11 and …