41. (II) Determine the stopping distances for an automobile with an initial speed of 95 km/h and human reaction time of 1.0 s: (a) for an acceleration a = -5.0 m/s²; (b) for a = –7,0 m/s². | %3D

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Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Can you solve number 41?

MOUS (I) "E
when the accelerationn
a=A + Bt. where A and
acce
constants.
ach
35. (II) A world-class sprinter can reach a top speed (of about
11.5 m/s) i the first 15.0 m of a race. What is the average
acceleration of this sprinter and how long does it take her tO
reach that speed?
47. (II
Ma
an
thị
36. (II) An inattentive driver is traveling 18.0 m/s when he
notices a red light ahead. His car is capable of decelerating
at a rate of 3.65 m/s?. If it takes him 0.200 s to get the
brakes on and he is 20.0 m from the intersection when he
sees the light, will he be able to stop in time?
0.
M
37. (II) A car slows down uniformly from a speed of 18.0 m/s to
rest in 5.00 s. How far did it travel in that time?
Mary
38. (II) In coming to a stop, a car leaves skid marks 85 m long
on the highway. Assuming a deceleration of 4.00 m/s², esti-
mate the speed of the car just before braking.
4.
39. (II) A car traveling 85 km/h slows down at a constant
0.50m/s² just by "letting up on the gas." Calculate (a) the
distance the car coasts before it stops, (b) the time it takes
to stop, and (c) the distance it travels during the first and
fifth seconds.
99
40. (II) A car traveling at 105 km/h strikes a tree. The front end
of the car compresses and the driver comes to rest after
traveling 0.80 m. What was the magnitude of the average
acceleration of the driver during the collision? Express the
answer in terms of "g's," where 1.00 g = 9.80 m/s².
2.
66
41. (II) Determine the stopping distances for an automobile
with an initial speed of 95 km/h and human reaction time of
1.0s: (a) for an acceleration
a = -7.0 m/s².
a = -5.0 m/s²; (b)
for
%3D
42. (II) A space vehicle accelerates uniformly from 65 m/s at
t = 0 to 162 m/s at t = 10.0 s. How far did it move
%3D
%D
between t = 2.0 s and t = 6.0 s?
%3D
%3D
46 CHAPTER 2 Describing Motion: Kinematics in One D
Transcribed Image Text:MOUS (I) "E when the accelerationn a=A + Bt. where A and acce constants. ach 35. (II) A world-class sprinter can reach a top speed (of about 11.5 m/s) i the first 15.0 m of a race. What is the average acceleration of this sprinter and how long does it take her tO reach that speed? 47. (II Ma an thị 36. (II) An inattentive driver is traveling 18.0 m/s when he notices a red light ahead. His car is capable of decelerating at a rate of 3.65 m/s?. If it takes him 0.200 s to get the brakes on and he is 20.0 m from the intersection when he sees the light, will he be able to stop in time? 0. M 37. (II) A car slows down uniformly from a speed of 18.0 m/s to rest in 5.00 s. How far did it travel in that time? Mary 38. (II) In coming to a stop, a car leaves skid marks 85 m long on the highway. Assuming a deceleration of 4.00 m/s², esti- mate the speed of the car just before braking. 4. 39. (II) A car traveling 85 km/h slows down at a constant 0.50m/s² just by "letting up on the gas." Calculate (a) the distance the car coasts before it stops, (b) the time it takes to stop, and (c) the distance it travels during the first and fifth seconds. 99 40. (II) A car traveling at 105 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.80 m. What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "g's," where 1.00 g = 9.80 m/s². 2. 66 41. (II) Determine the stopping distances for an automobile with an initial speed of 95 km/h and human reaction time of 1.0s: (a) for an acceleration a = -7.0 m/s². a = -5.0 m/s²; (b) for %3D 42. (II) A space vehicle accelerates uniformly from 65 m/s at t = 0 to 162 m/s at t = 10.0 s. How far did it move %3D %D between t = 2.0 s and t = 6.0 s? %3D %3D 46 CHAPTER 2 Describing Motion: Kinematics in One D
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