Question
Asked Sep 25, 2019
171 views

A train 400 m long is moving on a straight track with a speed of 84.8 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.2 km/h. Assuming constant acceleration, determine how long the train blocked the crossing. Disregard the width of the crossing.

check_circle

Expert Answer

Step 1

The average velocity of the train moving on a straight track is,

Substitute the values,

help_outline

Image Transcriptionclose

2 84.8km/16.2km/h 2 =50.5km/h

fullscreen
Step 2

The time taken by the train blocked on the c...

help_outline

Image Transcriptionclose

(400m0.001k t= (505km/h) 0.400km 50.5km/h 0.00792h 3600s' 1h 28.5s

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Physics

Kinematics

Related Physics Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Consider the forces shown in the figure. a.) Find the magnitude of the force F1 shown in the figure ...

A: Click to see the answer

question_answer

Q: A small block travels up a frictionless incline that is at an angle of 30.0° above the horizontal. T...

A: Given information:Initial velocity of the block (u) = 1.64 m/sInclination of the surface (θ) = 300Ac...

question_answer

Q: Two long, parallel conductors, separated by 2.0 cm, carry currentsin the same direction. The first w...

A: The current in first wire is 1.00A and second wire is 5.00A, and both are separated by a distance of...

question_answer

Q: Find the horizontal and vertical components of the 118–m displacement of a superhero who flies from ...

A: Given information:Displacement of the superhero (d) = 118 mAngle made by the displacement vector wit...

question_answer

Q: A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed ...

A: Consider the three different motions the engine is subjected to. First when it is fired and travels ...

question_answer

Q: Which of the following best describes the degrees of freedom for a polyatomic gas at 500 K: a) All f...

A: Degrees of freedom:It is defined as the number of independent ways that a molecule can move in free ...

question_answer

Q: Hello, (a) In what direction would the ship in Exercise 3.57 have to travel in order to have a veloc...

A: First resolve the velocity in x and y direction

question_answer

Q: A bullet is fired into the air with an initial velocity of 1,500 feet per second at an angle for 45°...

A: The bullet can be considered as a projectile. The equation for the horizontal velocity of the bullet...

question_answer

Q: A surveyor measures the distance across a straight river by the following method. Starting directly ...

A: Given information:The distance she walked across the bank of river (d) = 138 mThe angle she sights, ...