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
Alborosie
3 years ago
8

4. A train is travelling at a speed of 60 km/ h. Brakes are applied so as to produce a uniform

Physics
1 answer:
maxonik [38]3 years ago
7 0

Answer:

33.33 m

Explanation:

Applying Newton's equation of motion,

v² = u²+2as...................... Equation 1

Where v = final velocity of the train, u = initial velocity of the train, a = acceleration of the train, s = distance.

make s the subject of the equation

s = (v²-u²)/2a................ Equation 2

Given: v = 0 m/s ( brought to rest), u = 60 km/h = 60(1000/3600) m/s = 16.67 m/s, a = -0.5 m/s²

Substitute this values into equation 2

s = (0-16.67)/-0.5

s = -16.67/-0.5

s = 33.33 m

You might be interested in
From the Bohr Model diagram, assuming the atom is neutral, what element is represented by the diagram? A) Argon B) Chlorine Elim
viktelen [127]

The actual answer is B) Chlorine

According to the Bohr Model diagram, the atom has seventeen electrons. This makes it Chlorine.


Sorry if i'm late!!

5 0
4 years ago
Read 2 more answers
To impress his friends while riding on a carnival
s344n2d4d5 [400]

Answer:

B. decreases while his angular speed remains  unchanged.

Explanation:

His angular speed will always be the same as the wheel's angular speed, which remains constant as it's in uniform motion. As for linear speed, which is defined as the product of angular speed and distance r to the center of rotation, and his distance to center is decreasing, his linear speed must be decreasing as well.

8 0
3 years ago
A descending elevator of mass 1,000 kg is uniformly decelerated to rest over a distance of 8 m by a cable in which the tension i
Stolb23 [73]

The speed  V_{i} of the elevator at the beginning of the 8 m descent is nearly 4 m/s. Hence, option A is the correct answer.

We are given that-

the mass of the elevator (m) = 1000 kg ;

the distance the elevator decelerated to be y = 8m ;

the tension is T = 11000 N;

let us determine the acceleration 'a' by using Newton's second law of motion.

∑Fy = ma

W - T = ma

(1000kg x 9.8 m/s² ) - 11000N = 1000 kg x a

9800 - 11000 = 1000

a = - 1.2 m/s²

Using the equation of kinematics to determine the initial velocity.

V_{f} ² = V_{i}² + 2ay

V_{i} = √ ( 2 x 1.2m/s² x 8 m )

V_{i} = √19.2 m²/s²

V_{i} = 4.38 m/s   ≈ 4 m/s

Hence, the initial velocity of the elevator is 4m/s.

Read more about the Equation of kinematics:

brainly.com/question/12351668

#SPJ4

8 0
1 year ago
What is the difference between organic and inorganic material?
babymother [125]

Organic materials comes from living things while inorganic materials comes from non living things


Organic materials are those composed mainly of carbon they are derived from living things while inorganic materials are derived from non living things sucjh as rocks etc

5 0
2 years ago
What is the kinetic energy of a baseball with a mass of 0.133 kg and moving at a speed of 28.7m/s
blsea [12.9K]

Answer:

54.7 J

Explanation:

kinetic energy formula

3 0
3 years ago
Other questions:
  • Two metal spheres are suspended from strings. The
    14·1 answer
  • How much heat is absorbed by a 47g iron skillet when its temperature rises from 12oC to 20oC?
    13·1 answer
  • If the voltage across a circuit element of constant resistance is doubled, how is the current through the circuit element affect
    9·1 answer
  • What best describes the dropping height of a ball that bounced back up to a height of 45 centimeters?
    7·1 answer
  • Please help please help
    12·1 answer
  • When light passes from a more-dense to a less-dense medium—from glass to air, for example—the angle of refraction predicted by S
    14·1 answer
  • Which of the following statements apply to electric charges?
    5·1 answer
  • A chemical reaction occurs. Which of the following would indicate that energy is transformed during the reaction?
    14·2 answers
  • 5x - 1 1 - 2x<br>3<br>5<br>11.152<br>&lt;8+2​
    5·1 answer
  • Question 25 of 30
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!