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PHYS 221 Midterm: PHYS 221 Iowa State Exam 1 2010Fall Solution

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turquoisegnu128
15 Feb 2019
School
Iowa State University
Department
Physics
Course
PHYS 221
Professor
All

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Document Summary

Note: the unit vectors in the +x, +y, and +z directions of a right-handed cartesian coordinate system are i, j, and k , respectively. In this exam, assume that the magnitude of the acceleration due to earth"s gravity at the surface of the earth is g = 9. 80 m/s2. Problems 1 through 15 are worth 2 points each: the speed of a car is 72. 0 km/hour, which can also be expressed as ____ m/s. %& = 20. 0 m / s: two vectors. Which one of the other five vectors shown is equal to. Using the rule for vector addition, one sees from the figure that. The magnitude of a vector product is the magnitude of the first vector times the component of the second vector that is perpendicular to the first vector. C = dc = 2 2 = 4 , D = ad = 1(2) = 2 , and. 1: a particle is moving along the x-axis.

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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Related Questions

Express in unit-vector notation the following vectors, each of which has magnitude 17.0 cm. (a) Vector Eā†’Eā†’ Ā Ā is directed 27.0Ā° counterclockwise from the positive x-axis, (b) Vector Fā†’Fā†’ is directed 27.0Ā° counterclockwise from the positive y-axis, (c) Vector Gā†’Gā†’ is directed 27.0Ā° clockwise from the negative y-axis.

Express in unit-vector notation the following vectors, each of which has magnitude 17.0 cm. (a) Vector EĀ Ā is directed 27.0Ā° counterclockwise from the positiveĀ x axis, (b) Vector FĀ is directed 27.0Ā° counterclockwise from the positiveĀ y axis, (c) Vector GĀ is directed 27.0Ā° clockwise from the negative y axis.

  1. An object moves clockwise with decreasing speed around an oval track. The velocity vectors at points G and H arc shown.

a. In the space at right, copy the velocity vectors Ā and Ā . From these vectors, determine the change in velocity vector .

b. If point H were chosen to lie closer to point G, describe how Ā would change (direction and magnitude).

Ā 

c. Describe how you would determine the acceleration (direction and magnitude) at point

G. In the space at right, indicate the direction of the acceleration of the object at point G.

d. Copy Ā and Ā (placed "tail-to-tail") in the space at right. How does the angle between the acceleration and velocity vectors compare to 900? (i.e., Is the angle greater than, less than, or equal to 90Ā°?)

e.

Generalize your results above and from tutorial to answer the following question:

For an object moving along a curved trajectory, how does the angle between the acceleration and velocity vectors compare to 90Ā° if the object moves with (i) constant speed, (ii) increasing speed, and (iii) decreasing speed?

Ā