2)- Google Chromedu.om/mod/quiz/attempt.php?attempt 1761581&cmid%3D875179NING SYSTEM (ACADEMIC)O d. 7 i +57 jTime left 0:U8:4TCLEAR MY CHOICEStarting at time t = 0, an object starts moving along a straight line. Itscoordinate in meters is given by: x(t)=6t-3t, where t is in seconds. Whenit momentarily stops its acceleration is:O a. -7.35O b. 14.70O C. -14.70d. -9.80An elevator cab and its load have a combined mass of 2.1 kg. When thecab, originally moving downward at 9.3 m/s, is brought to rest with

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Description: 2)- Google Chromedu.om/mod/quiz/attempt.php?attempt 1761581&cmid%3D875179NING SYSTEM (ACADEMIC)O d. 7 i +57 jTime left 0:U8:4TCLEAR MY CHOICEStarting at time t = 0, an object starts moving along a straight line. Itscoordinate in meters is given by:

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Starting at time t = 0, an object starts moving along a straight line. Its coordinate in meters is given by: x(t)=6t-3t³3, where t is in seconds. When it momentarily stops its acceleration is: О а. -7.35 O b. 14.70 О с. -14.70 O d. -9.80

Starting at time t = 0, an object starts moving along a straight line. Its coordinate in meters is given by: x(t)=6t-3t³3, where t is in seconds. When it momentarily stops its acceleration is: О а. -7.35 O b. 14.70 О с. -14.70 O d. -9.80

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter3: Two-dimensional Kinematics

Section: Chapter Questions

Problem 64PE: (a) Use the distance and velocity data in Figure 3.64 to find the rate of expansion as a function of...

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An athlete crosses a 25-m-wide river by swimming perpendicular to the water current at a speed of 0.5 m/s relative to the water. He reaches the opposite side at a distance 40 m downstream from his starting point. How fast is the water in the river flowing with respect to the ground? What is the speed of the swimmer with respect to a friend at rest on the ground?
The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. Figure 3.64 illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities: (a) relative to galaxy 2 and (b) relative to galaxy 5. The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information. Figure 3.64 Five galaxies on a straight line, showing their distances and velocities relative to the Milky Way (MW) Galaxy. The distances are in millions of light years (Mly), where a light year is the distance light travels in one year. The velocities are nearly proportional to the distances. The sizes of the galaxies are greatly exaggerated; an average galaxy is about 0.1 MlY across.
66. Useful background for this problem can be found in Multiple-ConceptExample 2. On a spacecraft two engines fi re for a time of 565 s. Onegives the craft an acceleration in the x direction of ax 5 5.10 m/s2, whilethe other produces an acceleration in the y direction of ay 5 7.30 m/s2.At the end of the fi ring period, the craft has velocity components ofvx 5 3775 m/s and vy 5 4816 m/s. Find the magnitude and direction ofthe initial velocity. Express the direction as an angle with respect to the1x axis.
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1. Andrew and Kevin decide to try out the physics ideas that they are learning and take their baseball pitching machine and a baseball to a 96 feet tall local building. Based on what they have learned the height, s(t), of a baseball, thrown straight up with an initial speed of 80 feet per second from a rooftop 96 feet high is s(t)=-16t^2+80t+96 where t is the elapsed time that the baseball is in the air. The baseball that is pitched miss the rooftop on their way down and eventually strike the ground. a) What is the average velocity of a baseball from t=0 to t=2 seconds? b) What is the velocity of the baseball 2 seconds after it is thrown? c) After how many seconds will the velocity of the baseball reach zero? d) What is the velocity of the baseball t seconds after it is thrown? e) What is the velocity of the baseball as it passes the roof top on the way down?
How can we say an object is moving? How can we say it is not? Cite an example for both conditions.
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14. A particle starts to move at O and travels in a straight line with velocity v cms-1, where v=4t4+t3+5t2+t+7 and t is the time in seconds after leaving O. The particle comes to rest at A. Calculate the total distance covered from t = 0 t = 4