Physics, 27.06.2020 21:01 lizdeleon248

A record of travel along a straight path is as follows: 1. Start from rest with constant acceleration of 2.60 m/s2 for 11.0 s. 2. Maintain a constant velocity for the next 2.60 min. 3. Apply a constant negative acceleration of −9.38 m/s2 for 3.05 as. (a) What was the total displacement for the trip

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Answer from: kris22elizondop9v1bb

x_total = 4662.5 m

Explanation:

This is a one-dimensional math problem, we must find the displacement in each section and then add them together.

1) let's use the equation

x = v₀ t + ½ a t²

where it indicates that part of rest for which v₀ = 0

x₁ = ½ a₁ t²

x₁ = ½ 2.60 11²

x₁ = 157.3 m

2) The second displacement is at constant speed,

let's find the final speed of the previous displacement

v = v₀ + a₁ t₁

v = a₁ t₁

v = 2.60 11

v = 28.6 m / s

now we use the uniform speed

v = x₂ / t₂

x₂ = v t₂

let's reduce the time to SI units

t₂ = 2.60 min (60 s / 1min) = 156 s

x₂ = 28.6 156

x₂ = 4461.6 m

3) it is braking

x₃ = v t₃ - ½ a₃ t₃²

x₃ = 28.6 3.05 - ½ 9.38 3.05²

x₃ = 43.60m

a) total displacement is the sum of each displacement

x_total = x₁ + x₂ + x₃

x_total = 157.3 + 4461.6 + 43.60

x_total = 4662.5 m

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

Ithink it’s 98 because jajajjajansmsmjs

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