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midterm1sol_09

# midterm1sol_09 - 77777 77777 Instructor Ihas/Biswas PHYSICS...

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Unformatted text preview: 77777 77777 Instructor: Ihas/Biswas PHYSICS DEPARTMENT PHY 2053 Exam 1, 120 minutes October 14, 2009 Name (print, last first): 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 off. 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/s 2 Neglect air resistance except when stated otherwise. All ropes, strings, and pulleys are massless. 1. A rowboat crosses a river with a velocity of 3.21 mi/h at an angle 62.5 ◦ north of west relative to the water. The river is 0.675 mi wide and carries an eastward current of 1.25 mi/h. How far upstream from the starting point is the boat when it reaches the opposite shore? (1 mile = 5280 ft.) (1) 291 ft (2) 458 ft (3) 374 ft (4) 660 ft (5) 880 ft 2. A rowboat crosses a river with a velocity of 3.34 mi/h at an angle 62.5 ◦ north of west relative to the water. The river is 0.880 mi wide and carries an eastward current of 1.25 mi/h. How far upstream from the starting point is the boat when it reaches the opposite shore? (1 mile = 5280 ft.) (1) 458 ft (2) 374 ft (3) 660 ft (4) 880 ft (5) 291 ft 3. A rowboat crosses a river with a velocity of 3.41 mi/h at an angle 62.5 ◦ north of west relative to the water. The river is 0.660 mi wide and carries an eastward current of 1.25 mi/h. How far upstream from the starting point is the boat when it reaches the opposite shore? (1 mile = 5280 ft.) (1) 374 ft (2) 660 ft (3) 880 ft (4) 291 ft (5) 458 ft 4. A rocket is launched at an angle of 53 degrees above the horizontal with an initial speed of 100 m/s. The rocket moves for 3.0 seconds along its initial straight line of motion with an acceleration of 30 m/s 2 . What is the horizontal component of the distance covered by the rocket during this time? (1) 260 m (2) 690 m (3) 69 m (4) 180 m (5) 360 m 5. A rocket is launched at an angle of 53 degrees above the horizontal with an initial speed of 100 m/s. The rocket moves for 6.0 seconds along its initial straight line of motion with an acceleration of 30 m/s 2 . What is the horizontal component of the distance covered by the rocket during this time?...
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midterm1sol_09 - 77777 77777 Instructor Ihas/Biswas PHYSICS...

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