Florida Atlantic University - PHY 2048L exam1-Practice. Answer Key Provided at the end of the paper

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Can an object be moving while have a constant acceleration of zero? A) Yes B) No 1) 2) If ... vector A = 3 x^ + 2 y^ and B = 5 x^ - b y^ and their dot product is zero, what is the magnitude of B ? A) 9.01 B) -7.50 C) 7.50 D) 5.00 2) 3) If vector A = 3 x^ + 2 y^ and B = 5 x^ - b y^ and their dot product is zero, what is the angle of B when measured counter-clockwise from the x axis? A) 56.69 degrees B) 303.69 degrees C) 146.31 degrees D) 306.01 degrees 3) 4) Vector A has a magnitude of 40 and is directed at an angle of 30 degrees from the positive x axis, and vector B is directed in the positive y direction completely. If their dot product is 300 what is the magnitude of vector B ? A) 30.00 B) 17.32 C) 10.00 D) 15.00 4) 5) A ball is thrown upwards at 20 m/s from top of a building which is 50 meters tall relative to the ground. What is the maximum height relative to the ground the ball reaches? A) 127.42 m B) 70.39 m C) 2.03 m D) 20.39 m 5) 9) 1 https://www.coursehero.com/file/14730742/vBmix-test1pdf/ This study resource was https://www.coursehero.com/file/20925635/exam1-practice/ shared via CourseHero.com This study resource was shared via CourseHero.com10) An object is moving in the x direction only and its acceleration is given by a(t)= +5 m/s2 - 2 m/s3 t. The object is initally at rest. What is the objects velocity? A) v(t) = +5 m/s2 t - 1/3 m/s3 t2 B) v(t) = +5 m/s2 t - 1 m/s3 t2 C) v(t) = - 5 m/s3 D) v(t) = +5/2 m/s2 t2 - 1/3 m/s3 t3 10) 11) An object is moving in the x direction only and its acceleration is given by a(t)= +5 m/s2 - 2 m/s3 t. What is the displacement of the object after 2 seconds? A) +7.33 m B) +6.00 m C) -1.00 m D) +16.00 m 11) 12) A ball is thrown upward at v0 and it takes a time of, t, to reach its maximum vertical displacement. What is v0? A) v0 = 2 g t B) v0 = g t2 C) v0 = (g t)/2 D) v0 = g t 12) 13) Vector A has a magnitude of 10 and is directed at an angle of 30 degrees from the positive x axis, vector B has a magnitude of 5 and is directed in the negative y direction completely, and vector C has a magnitude of 20 and is directed at in the negative x direction completely. If R = B - A - 1/2 C , what is the magnitude of R ? A) 30.00 B) 15.11 C) 10.09 D) 13.66 13) 14) Car 1 is initially at 1000 m and it is moving at a constant velocity of 10 m/s in the + x direction. Car 2 is intially at 400 m moving at a constant velocity of 30 m/s. How long will it take car 2 to catch 1? A) 5.66 s B) 20.00 s C) 60.00 s D) 30.00 s 14) 15) If the acceleration vector is always in the same direction as the velocity vector, A) the velocity vector will not change directions and its magnitude will increase. B) the velocity vector will change directions and its magnitude will decrease. C) the velocity vector will change directions and its magnitude will not change. D) the velocity vector will not change directions and its magnitude will decrease. 15) 16) What of the following is a possible unit of acceleration? A) miles/second B) mile/kilometer C) second/minute2 D) miles/minute2 16) 17) A ball is thrown vertically upward from the side of a building. At any point below its launching point, the magnitude or amount of its velocity is A) less than the magnitude of its initial velocity. B) greater than the magnitude of its initial velocity. C) equal to the magnitude of its initial velocity. D) could be greater to or lesser than the magnitude of its initial velocity depending on its displacement. 17) 18) Vector A is directed at an angle of 150 degrees counter-clockwise from the +x axis. If B = -3 A , what is the angle for B ? A) 50 degrees counter-clockwise from the x axis. B) 330 degrees counter-clockwise from the x axis. C) 150 degrees counter-clockwise from the x axis. D) 300 degrees counter-clockwise from the x axis. 18) 2 https://www.coursehero.com/file/14730742/vBmix-test1pdf/ This study resource was https://www.coursehero.com/file/20925635/exam1-practice/ shared via CourseHero.com This study resource was shared via CourseHero.com19) A car is initially at rest and accelerates constantly. After 5 seconds, it is moving at 20 m/s in the positive x direction. It then moves at a constant velocity of 20 m/s for an additional 10 seconds. What is the displacement of the car over the entire trip? A) 200.00 m B) 50.00 m C) 40.00 m D) 250.00 m 19) 20) If an object is moving in 1-D when is the distance equal to the displacement. A) If the velocity and acceleration are in opposite directions. B) If its position increases and decreases. C) If the average velocity is zero over a time interval which is not zerp. D) If the object never changes direction. 20) 21) A car is initially moving at 40 m/s in the positive x direction and slams on its brakes. The brakes cause the car accelerate constantly at 5 m/s2 in the negative x direction. How long does it take the car to come to a stop? A) 3.00 s B) 6.00 s C) 8.00 s D) 0.16 s 21) 22) A car is initially moving at 40 m/s in the positive x direction and slams on its brakes. The brakes cause the car accelerate constantly at 5 m/s2 in the negative x direction. Over the time interval when the brakes are applied, how far will the car travel before it comes to a stop? A) 130.00 m B) 40.00 m C) 160.00 m D) 180.00 m 22) 23) Vector A is directed at an angle of 150 degrees counter-clockwise from the +x axis and has magntiude of 10. If B = -3 A , what is the y component of B ? A) 15.00 B) -17.32 C) 8.66 D) -15.00 23) 3 [Show More]

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