Physics Test 1

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Oklahoma City Community College *

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MISC

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Physics

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Apr 3, 2024

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Name: Score: 20 Multiple choice questions Term An object is moving along the x axis. The graph shows its position from the starting point as a function of time. Various segments of the graph are identified by the letters A, B, C, and D. What is the acceleration of the object at t = 7.0 s? (Practice Test 1 #17) zero m/s^10 zero m/s^2 zero m/s^0 zero m/s^7 1 of 20 Term Three or more vectors with unequal magnitudes can be added together so their sum is zero (1.6) True False 2 of 20

Term At time t = 0 s, an object is observed at x = 0 m; and its position along the x axis follows this expression: x = 4 t + t 2, where the units for distance and time are meters and seconds, respectively. What is the object's displacement x between t = 1.0 s and t = 3.0 s? (Practice Test 1 #11) 17 m/s (9.8)(3.5)^2 / (2)(3.5) = 17 the rifle with the short barrel 4.05 m/s2, north 75/18.5 = 4.05 +16m 4t+t^2 4(3) + (3)^2= 21 21-5 =16 3 of 20 Term A partly-full paint can has 0.418 U.S. gallons of paint left in it. (a) What is the volume of the paint, in cubic meters? (b) If all the remaining paint is used to coat a wall evenly (wall area = 10.8 m2), how thick is the layer of wet paint? Give your answer in meters (Ch 1 #7) In the same time interval, the velocity of car 1 changes by a greater amount than car 2 does a) 0.0016 m^3 b) 0.000146 m --1 U.S gallon = 3.785 X 10^-3 --(0.418)(3.785 X 10^-3) = 0.0016 or 1.58 X 10^-3 --(1.58 X 10^-3) = 10.8a -- a = 1.46 X 10^-4 or 0.000146 2.44 m a) 160 meters per minute b) 480 meters per minute 4 of 20

Term A space vehicle is coasting at a constant velocity of 18.2 m/s in the + y direction relative to a space station. The pilot of the vehicle fires a RCS (reaction control system) thruster, which causes it to accelerate at 0.395 m/s2 in the + x direction. After 52.6 s, the pilot shuts off the RCS thruster. After the RCS thruster is turned off, find (a) the magnitude and (b) the direction of the vehicle's velocity relative to the space station. Express the direction as an angle (in degrees) measured from the + y direction (Ch 3 #7) a) 27.62 m/s b) 48.74 degrees a) 4657.5 m b) 2.89 mi a) 7.96 m/s b) 8.36 m/s a) -0.61m/s^2 b) 9.59 m/s 5 of 20 Term Each drawing shows three points along the path of a projectile, one on its way up, one at the top, and one on its way down. The launch point is on the left in each drawing. Which drawing correctly represents the acceleration a of the projectile at these three points? (Ch 3 #1) 12.7 s 11.4 = 28.6 - 1.35 * t 4h 4 4s 6 of 20

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Term A projectile is fired horizontally with an initial speed of 57 m/s. What are the horizontal and vertical components of its displacement 3.0 s after it is fired? horizontal vertical (Practice Test 1 #29) 170m -44m 50 m/s 40 m/h 180m -44m 7 of 20

Term A jogger travels a route that has two parts. The first is a displacement A of 2.30 km due south, and the second involves a displacement B that points due east. The resultant A + B displacement + has a magnitude of 4.55 km. (a) What is the magnitude of B, and (b) what is the direction of A + B as a positive angle relative to due south? Suppose that A - B had a magnitude of 4.55 km. (c) What then would be the magnitude of B, and (d) what is the direction of A - B relative to due south? (Ch 1 #10) a) 7.49 km b) 2.25 km c) 45 degrees during B interval only a) 160 meters per minute b) 480 meters per minute a) 3.93 km b) 59.66 degrees c) 3.93 km d) 59.66 degrees 8 of 20 Term A rifle, at a height H above the ground, fires a bullet parallel to the ground. At the same instant and at the same height, a second bullet is dropped from rest. In the absence of air resistance, which bullet, if either, strikes the ground first? (3.3) 18.52 m/s a and c both bullets velocity 9 of 20

Term A automotive test driver travels due north in a prototype hybrid vehicle at 30 mi/h for 2 hours. She then reverses her direction and travels due south at 60 mi/h for 1 hour. What is the average speed of the vehicle? (Practice Test 1 #18) 30 m/h 80 m/h 35 m/h 40 m/h 10 of 20 Term A turtle takes 3.5 minutes to walk 18 m toward the south along a deserted highway. A truck driver stops and picks up the turtle. The driver takes the turtle to a town 1.1 km to the north with an average speed of 12 m/s. What is the magnitude of the average velocity of the turtle for its entire journey? (Practice Test 1 #2) 4.6 m/s 3.6 m/s 0.74 m/s 18.52 m/s 11 of 20

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Term A puck is moving on an air hockey table. Relative to an x , y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v 0 x = +7.0 m/s and ax = +7.7 m/s2. The y components of the puck's initial velocity and acceleration are v 0 y = +8.6 m/s and ay = -1.6 m/s2. Find (a) the magnitude v and (b) the direction θ of the puck's velocity at a time of t = 0.50 s. Specify the direction relative to the + x axis (Ch 3 #5) false --- 1s one 12 of 20 Term The highest waterfall in the world is Angel Falls in Venezula, with a total drop of 979 m. Write the height of the falls in cm using scientific notation (1.2) 9.79 X 10^6 cm a) 4657.5 m b) 2.89 mi 9.79 X 10^4 cm 9.79 X 10^2 cm 13 of 20

Term You live in the building on the left in the drawing, and a friend lives in the other building. The two of you are having a discussion about the heights of the buildings, and your friend claims that the height of his building is more than 1.50 times the height of yours. To resolve the issue you climb to the roof of your building and estimate that your line of sight to the top edge of the other building makes an angle of 21 ° above the horizontal, whereas your line of sight to the base of the other building makes an angle of 52 ° below the horizontal. Determine the ratio of the height of the taller building to the height of the shorter building. State whether your friend is right or wrong. (Ch 1 #14) 1.3 (no units), wrong 000 9.8 m/s^2 18.52 m/s 14 of 20 Term Suppose the vectors A and B in the drawing have magnitudes of 6.0 m and are directed as shown. What are A x and B x, the scalar components of A and B along the x axis? (Ch 1 #4) Their magnitudes are the same, but their directions aren't A x = -(6.0 m) cos 35 ° = -4.9 m; B x = +(6.0 m) cos 35 ° = +4.9 m All three balls have the same acceleration at any instant. 54.2 m --61.0 - 48.2 = 12.8 --tan (13.3) = 12.8 / x --x = 54.2 15 of 20

Term The magnitude of a vector has doubled, its direction remaining the same. Can you conclude that the magnitude of each component of the vector has doubled? (1.7) Yes No 16 of 20 Term A automotive test driver travels due north in a prototype hybrid vehicle at 30 mi/h for 2 hours. She then reverses her direction and travels due south at 60 mi/h for 1 hour. What is the average velocity of the vehicle? (Practice Test 1 #19) 40 m/h a) -0.61m/s^2 b) 9.59 m/s zero mi/h 3.6 m/s 17 of 20 Term Two nonzero perpendicular vectors can be added together so their sum is zero. (1.6) True False 18 of 20 Term A tennis ball is hit upward into the air and moves along an arc. Neglecting air resistance, where along the arc do the minimum and maximum speeds occur? (3.3) 2.44 m They can be used only when the object is undergoing constant acceleration. The maximum speed occurs at the lowest point and the minimum occurs at the highest. The directions are the same 19 of 20

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Privacy Terms Term Given the quantities a = 8.4 m, b = 2.3 s, c = 94 m/s, what is the value of the quantity d = (a^3)/(cb^2) ? (Ch 1 #6) 17 m/s (9.8)(3.5)^2 / (2)(3.5) = 17 a) -0.61m/s^2 b) 9.59 m/s 1.20 m^2/s --8.4^3 / 69(4.2)^2 1.20 m^2/s --8.4^3 / 7(4.2)^2 20 of 20 English (USA)

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