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
ad-work [718]
3 years ago
12

Until a train is a safe distance from the station, it must travel at 5 m/s. Once the train is on open track, it can speec

Physics
1 answer:
nadezda [96]3 years ago
4 0

Answer:

The acceleration of the train is 5 m/s².

Explanation:

Given:

let the initial velocity of a train = 5 m/s and

final velocity of a train = 45 m/s

time taken = 8 s

To find:

acceleration: ?

Solution:

We define acceleration as change in velocity per unit time that is the difference between the final velocity and initial velocity divided by time.

Acceleration = \frac{\textrm{final velocity} - \textrm{initial velocity}}{time} \\

On substituting the above values we get the required acceleration

Acceleration = \frac{45 - 5}{8}\\ =\frac{40}{8}\\ =5\ m/s^{2}

Therefore,the acceleration of the train is 5 m/s².

You might be interested in
Which of the following best describes a property of water?
stiks02 [169]

Correct answer is option C.

Remaining liquid over a wide temperature range  

Other options are invalid.

3 0
3 years ago
Read 2 more answers
1. Consider three objects: Object A is a hoop of mass m and radius r; Object B is a sphere
Zarrin [17]

a) Object C (the disk) has the greatest rotational inertia (\frac{3}{2}mr^2)

b) Object B (the sphere) has the smallest rotational inertia (\frac{4}{5}mr^2)

Explanation:

The moments of inertia of the three objects are the following:

1) For a hoop of negligible thickness, it is

I=MR^2

where M is its mass and R its radius. For the hoop in this problem,

M = m

R = r

Therefore, its moment of inertia is

I=(m)(r)^2=mr^2

2) For a solid sphere, the moment of inertia is

I=\frac{2}{5}MR^2

where M is its mass and R its radius. For the sphere in this problem,

M = 2m

R = r

Therefore, its moment of inertia is

I=\frac{2}{5}(2m)(r)^2=\frac{4}{5}mr^2

3) For a disk of negligible thickness, the moment of inertia is

I=\frac{1}{2}MR^2

where M is its mass and R its radius. For the disk in this problem,

M = 3m

R = r

Therefore, its moment of inertia is

I=\frac{1}{2}(3m)(r)^2=\frac{3}{2}mr^2

So now we can answer the two questions:

a) Object C (the disk) has the greatest rotational inertia (\frac{3}{2}mr^2)

b) Object B (the sphere) has the smallest rotational inertia (\frac{4}{5}mr^2)

Learn more about inertia:

brainly.com/question/2286502

brainly.com/question/691705

#LearnwithBrainly

7 0
3 years ago
What happened in the gray zone between solid and liquid​
Sergio039 [100]

Answer:

Transition has to cross between solid and liquid in gray zone.No indoor organized public events and social gatherings are allowed, except with members of the same household.

5 0
2 years ago
Describe how Rutherford's experiments changed the accepted scientific model of the atom.
lorasvet [3.4K]

Rutherford's model of the atom (ESAAQ) Rutherford carried out some experiments which led to a change in ideas around the atom. His new model described the atom as a tiny, dense, positively charged core called a nucleus surrounded by lighter, negatively charged electrons.

4 0
3 years ago
Scientists want to place a telescope on the moon to improve their view of distant planets. The telescope weighs 200 pounds on Ea
LuckyWell [14K]

Answer:

Explanation:

the weight of the telescope decreases  because the moon attract the body with less force as compared to earth due to less gravity as compared to earth

6 0
3 years ago
Other questions:
  • If the total number of earthquakes annually averages 14,500 approximately how many are magnitude 5 or higher? and show work.
    15·1 answer
  • How do acids taste?<br><br> A. Sweet<br> B. Soapy<br> C. Bitter<br> D. Sour
    15·2 answers
  • The potential energy of an apple is 6.00 joules. The apple is 3.00-meters high. What is the mass of the apple?
    10·1 answer
  • Написать сочинение на тему маленький человечек​
    13·1 answer
  • Which subatomic particles have an electrical charge?
    11·2 answers
  • Describe how acid rain<br> would react with rocks<br> over time.
    11·1 answer
  • What is kelvin?(scientifically plz)
    10·1 answer
  • What would happen if you threw a grenade into a woodchipper?
    9·2 answers
  • Calculate the moment of inertia and the rotational kinetic energy for the following objects spinning about a central axis (in un
    7·1 answer
  • 1. Ja pendulum has a length of 0,500 m.What is the period of the pendulum? Use
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!