Physics Fundamentals
Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 2, Problem 7Q
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The position r of a particle moving in an xy plane is given by ř seconds. In unit-vector notation, calculate (a) 7, (b) V , and (c) a for t = 3.00 s. (d) What is the angle between the positive direction of the x axis and a line tangent to the particle's path at t = 3.00 s? Give your answer in the range of (-180°; 180°). (4.00r3 – 1.00t)î + (5.00 – 1.00r4)j with 7 in meters and t in (a) Number i i Units (b) Number ît i Units i (c) Number i i Units (d) Number i Units
The vector components of the position of a particle moving in the xy plane as a function of time are~x = bt2ˆi and ~y = ct3ˆj, where b and c are positive constants with the appropriate dimensions such thatthe components will be in meters.(a) At what time is the angle between the particle’s velocity and the x−axis equal to 45◦? [4](b) Determine the velocity and acceleration of the particle in unit vector notation in terms of b andc when the velocity is directed at an angle of 45◦relative to the x−axis
A lift is coming from 8th floor and is just about to reach 4th floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct? (a) x < 0, v < 0, a > 0 (b) x > 0, v < 0, a < 0 (c) x > 0, v < 0, a > 0 (d) x > 0, v > 0, a < 0
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