1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vadim26 [7]
3 years ago
11

You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped a

t a red light along a road headed down a hill. You find that the slope of the hill is θ= 12.0°, that the cars were separated by distance d = 24.0 m when the driver of car A put the car into a slide (it lacked any automatic anti-brake-lock system), and that the speed of car A at the onset of braking was Vo= 18.0 m/s.
With what speed did car A hit car B if the coefficient of kinetic friction was (a) 0.60 (dry road surface) and (b) 0.10 (road surface covered with wet leaves)?
Physics
1 answer:
AfilCa [17]3 years ago
7 0

Answer:

Explanation:

a Downward acceleration of car A along the slope

= g sinθ - μ g cosθ

= g ( sinθ - μ  cosθ)

= 9.8 ( sin 12 - .6 x cos 12 )

= 9.8 x ( .2079 - .5869 )

= - 3.714 m / s²

So there will be deceleration

v² = u² - 2 a s

= 18² - 2 x 3.714 x 24

= 324 - 178

= 146

v = 12 .08 m /s

b )

In the second case , kinetic friction changes

downward acceleration

= g ( sinθ - μ  cosθ)

= 9.8 ( sin12 - .1 x cos 12 )

9.8 ( .2079  -  .0978 )

= 1.079 m /s

there will be reduced acceleration

v² = u² - 2 a s

= 18² +2 x1.079 x 24

= 324 + 52

= 376

v = 19.4  m /s

You might be interested in
A pitcher throws a curveball that reaches the catcher in 0.61 s. The ball curves because it is spinning at an average angular ve
sashaice [31]

Answer:

22.36 rad

Explanation:

Applying,

ω = θ/t.............. Equation 1

Where ω  = angular velocity, θ = angular displacement of the baseball, t = time

make θ the subject of the equation

θ = ωt............... Equation 2

From the question,

Given: ω = 350 rev/min = 350(0.10472) = 36.652 rad/s, t = 0.61 s

Substitute these values into equation 1

θ = 0.61(36.652)

θ = 22.36 rad

Hence the angular displacement of the baseball is  22.36 rad

4 0
3 years ago
Please help me! Science is not my best subject
Paul [167]
1)solid
2)contact
3)conduction
4)Fluid
5)Less
6)More
7)Convection
8)Waves
9)Radiation
10)emit
11)absorb
8 0
3 years ago
If you hold a 50 kilogram barbell above your head for 3 seconds and
aalyn [17]

Answer:

c

if you calculate the net force you get 490 N

3 0
3 years ago
What is the buoyant force of a dog displacing 10 pounds of water?
scZoUnD [109]

Answer:

find V using d = M/V

Explanation:

F = d*V*g

d = density of fluid (in this case, 1000)

V = volume of object

g = gravity

3 0
2 years ago
How do solutions differ from other mixtures?
zalisa [80]
The answer is D.
I hope this helps.
7 0
3 years ago
Read 2 more answers
Other questions:
  • Consider a small child sliding down two differently shaped slides that have the same coefficient of kinetic friction. How must t
    14·1 answer
  • When two waves meet they combine according to the ____________________ principle?
    14·1 answer
  • An aquifer pump test was conducted in a confined aquifer where the initial piezometric surface was at elevation 12.45 m, and wel
    8·1 answer
  • What is the law that states that matter can not be created nor destroyed?
    13·1 answer
  • The clothes washer in your house consumes 470 kWh of energy per year. Price of the washer is $360 and the lifetime of the washer
    11·1 answer
  • In which region of the electromagnetic spectrum is this radiation found?
    9·1 answer
  • Partially correct answer iconYour answer is partially correct. A proton initially has and then 2.30 s later has (in meters per s
    9·1 answer
  • A string of length L is under tension, and the speed of a wave in the string is v. What will be the speed of a wave in the strin
    5·1 answer
  • ___ is the rate of change of velocity of an object? Formula: ___
    15·2 answers
  • NEED IT ASAP!!!!!!!!!!!!!!!!!!!!!
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!