Answer:
a) t = 19.6 s, b) fr = 1.274 10⁴ N
Explanation:
This is a Newton's second law problem
Y Axis
for the cabin
N₁-W₁ = 0
N₁ = W₁
for the trailer
N₂- W₂ = 0
N₂ = W₂
X axis
for the cabin plus trailer, where friction is only in the cabin
fr = (m₁ + m₂) a
the friction force equation is
fr = μ N
we substitute
μ N₁ = (m₁ + m₂) a
μ m₁ g = (m₁ + m₂) a
a = μ g 
let's calculate
a = 0.65 9.8 
a = 1,274 m / s²
a) to find the stopping distance we can use kinematics
Let's slow down the sI system
v₀ = 90 km / h (1000 m / 1km) (1h / 3600s) = 25 m / s
v = v₀ - a t
when it is stopped its speed is zero
0 = v₀ - at
t = v₀ / a
t = 25 / 1.274
t = 19.6 s
b) the friction force is
fr = 0.65 2000 9.8
fr = 1.274 10⁴ N
This is the braking force and also the forces that couple the cars.
B. number of oscillations in a given period of time.
Answer:
Electrical Engineering Assignment Help | Electrical Engineering Homework Help
Our electrical engineering assignment and homework services are a class apart compared to other online websites. If you are availing online electrical help from All Assignment Experts then this is what you can expect:
Qualified Experts: Committed and experienced team of assignment experts who ensure excellent grades in electrical engineering assignment writing services.
Affordable service: We understand that you are a student who wants to excel in electrical engineering and we ensure you get a value for money service.
Quality assistance for students worldwide: We ensure that the electrical engineering solution is not only of high quality but it is also plagiarism free and grammatically correct.
Guaranteed Satisfaction: We ensure students are stress free by ensuring highest grades in all the electrical engineering assignments.
We can also confidently guarantee that you’ll be satisfied with your Electrical engineering assignment solution. We strictly adhere to the deadlines provided by the students. We understand plagiarism adversely affects the grades of students. We ensure that solutions provided by us will be 100% plagiarism free.
Every good business venture is built solidly on providing the highest quality services to its customers. We are more than ready to provide you with the best electrical engineering assignment help and solutions. All you need to do is to share your requirements with
Answer: Acceleration is directly proportional to force.
Explanation: According to Newton's Second Law of Motion the amount of Force is equal to the product of mass and acceleration or F = ma. If we derive this formula for acceleration it will become a = F / m.
The relationship between acceleration and force is directly proportional which means that greater force will result to greater acceleration as along mass remains constant.
