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2023 PHY250 Physics Graded Exam With Answers (25 Solved Questions)

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    PHY250_TW | Chapter 3: Dynamics Question 1 Correct 6.00 points out of 6.00 Started on Sunday, January 1, 2023, 5:26 PM State Finished Completed on Sunday, January 1, 2023, 6:09 PM Time taken 42 mins 29 secs Grade 150.00 out of 150.00 ( 100 %) Feedback You’re off to a good start. A course grade of 70% is required to request a transcript. You’ve met that for the first exam already, but if you want to reattempt for a higher grade you can retake this assessment. Study hard for each exam, and consider using tutoring anytime you get stuck. Remember that 10 hours of tutoring are provided to you through your StraighterLine membership. A mass of 4 . 3 kg is accelerated to 6 . 0 m / s when a force of magnitude F is applied to it. If the same force is applied to a mass of 0 . 5 kg, what is the acceleration of this mass? Select one: a. 25 . 8 m / s b. 12 . 9 m / s c. 6 m / s d. 51 . 6 m / s 2 2 2 2 2

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    Question 2 Correct 6.00 points out of 6.00 Question 3 Correct 6.00 points out of 6.00 An airplane has an initial velocity with respect to the ground of 200 mph in an eastward direction. A strong wind begins to blow with a velocity of 80 mph from north to south. What are the x -and y -components of the total velocity of the plane when the wind is taken into account? Let north be the positive y -direction and east be the positive x -direction. Select one: a. v = +200 mph v = +80 mph b. v = +200 mph v = −80 mph c. v = +80 mph v = +200 mph d. v = +215 mph v = −80 mph The position of an object along the x -axis is described by the formula x = 2 t − 4 t . Which of the following are the correct formulas for the velocity and acceleration of the object? Select one: a. v = 2 t − t , a = 2 t − 4 b. v = 6 t − 4, a = 12 t c. v = (1/2)t − 2 t , a = (5/2) t − (2/3) t d. v = 6 t − 4, a = 6 x y x y x y x y 3 2 2 4 2 5 3

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    Question 4 Correct 6.00 points out of 6.00 Question 5 Correct 6.00 points out of 6.00 Two small carts, with masses m = 17 kg and m = 23 kg, are attached by two ideal ropes to a steel ball of mass m = 100 kg as shown in the diagram. What are the accelerations of the carts and the ball? Select one: a. 7 m / s b. 9 . 4 m / s c. 22 . 5 m / s d. 16 . 4 m / s e. None of the above Which is the standard unit of time in the metric system? Select one: a. minute b. second c. year d. hour 1 2 b 2 2 2 2

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