Vi = 0 m/s T = 10 s Find d = Find vf =

Lab activity information

Chapter 4 ProblemsGuided Practice Problems

Find the uniform acceleration that causes a car’s velocity to change from 32m/s to change to 76 m/s. In an 8.0 s period.

Problem #1

Given: Vi = 32 m/s Vf = 76 m/s T = 8.0 s

Unknown: a =

Problem #1

Equation: A = Δv Δt

Problem #1

Answer: 5.5 m/s/s

Problem #1

Solution: 76m/s-32m/s / 8 s =

Problem #1

A supersonic jet flying at 155 m/s is accelerated uniformly at the rate of 23.1 m/s2 for 30 s.

A. What is its final velocity? B. The speed of sound in air is 331 m/s. How

many times the speed of sound is the plane’s final speed?

Problem #2

Given: Time = 30 s A = 23.1 m/s2

Vi = 155 m/s ______________ Vf = Speed of sound is

331 m/s

Unknown: Vf =

Problem #2

Equation: A Vf = vi + at

Problem 2

Equation B: N= 848 m/s/331m/s=

Problem #2

Answer to A = 848 m/s

Problem #2

Answer to B:2.56 times

Problem #2

Solutions for A: 155m/s + (23.1 m/s/s)(30.0 s) =vf

Problem #2

Solution for B : 848 m/s/331m/s =

Problem #2

Determine the displacement of a plane that is uniformly accelerated from 66 m/s to 88 m/s in 14 s.

Problem #3

Given: 66 m/s = Vi

88 m/s = Vf

T = 14 s

Unknown: d

Problem #3

Equation D=(vf + vi)t/2 =

Problem #3

Answer #3: 550 m

Problem #3

Solution #3 : (88 m/s + 66 m/s)14 s/2 =

Problem #3

If a bullet leaves the muzzle of a gun with a speed of 500 m/s, and the barrel of the rifle is .9 m long. What is the acceleration of the bullet while in the barrel?

Problem #4

Given: Vf = 500 m/s D = .9 m Vi = 0 m/s

Unknown: A =

Problem #4

Equation: a = Vf

2 – vi2 /2d

Problem #4

Answer :1.38 X 105 m/s/s

Problem #4

Solution: (500 m/s)2-0 /(2) (0.9 m) =

Problem #4

A plane travels 600 m while being accelerated uniformly from rest at the rate of 5.0 m/s2. What final velocity does it attain?

Problem #5

Given: d = 600 m a= 5.0 m/s2

Vi = 0 m/s

Unknown: Vf =

Problem #5

Equation: Vf

2 =vi2 + 2ad

Problem #5

Answer: 77.5 m/s

Problem #5

Solution: Sq root 0 +2(5.0 m/s/s)(600 m) =

Problem #5

Page 82: 1,5, Page 83 : 8,9,10, 16 Page 84: 24, Reviewing concepts: 1,2,3,8, Applying concepts: 3, 8, 9 Due thursday

Assignment

Vf = vi + at d = ½ (vf + Vi)t d = vit + ½ at2

Vf2 = vi

2 + 2ad

Vi vf a t Vi d vf t Vi d a t Vf d vi a

Equations of Motion for Uniform acceleration