Essential University Physics
4th Edition
ISBN: 9780134988559
Author: Wolfson, Richard
Publisher: Pearson Education,
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Chapter 3.4, Problem 3.4GI
An object is moving initially in the +x-direction. Which of the following accelerations, all acting for the same time interval, will cause the greatest change in its speed? In its direction? (a) 10î m/s2; (b) 10ĵ m/s2; (c) 10î + 5ĵ m/s2; (d) 2î − 8ĵ m/s2
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An object has a position given by r = [2.0 m + (5.00 m/s)r]i + [3.0 m - (2.00 m/s2)/²\j.
where quantities are in SI units. What is the speed of the object at time 1 = 2.00 s?
A) 13.0
B) 6.40
C) 9.43
D) 7.00
E) 7.65
m/s
m/s
m/s
m/s
m/s
A proton initially has v = 6.0 î - 3.0 ĵ + 4.0 k and then 4.0 s later has v = -3.0 î - 3.0 ĵ + 4.0 k (in meters per second).
(a) For that 4.0 s, what is the proton's average acceleration aava in unit-vector notation?
m/s? î +
m/s? ĵ +
m/s² k
(b) For that 4.0 s, what are the magnitude and direction of aavg?
m/s?
° (from the +x axis in the xz plane)
An object has a position given by r = [2.0 m + (5.00 m/s)t]i + [3.0 m - (2.00 m/s2)t2]j, wherequantities are in SI units. What is the speed of the object at time t = 2.00 s?
Chapter 3 Solutions
Essential University Physics
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