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
iragen [17]
3 years ago
15

A locomotive is accelerating at 3.08 m/s2. It passes through a 20.8-m-wide crossing in a time of 2.93 s. After the locomotive le

aves the crossing, how much time is required until its speed reaches 29.4 m/s?
Physics
1 answer:
svp [43]3 years ago
6 0

Answer:

Required time t=5.8s

Explanation:

Given data

Acceleration a=3.08 m/s²

Speed v=29.4 m/s

Required

How much time t is required

Solution

As the train passes through the crossing its motion is described by:

v=v_{o}+at\\v-v_{o}=at\\and\\x=\frac{1}{2}(v+v_{o})t\\v+v_{o}=\frac{2x}{t}\\ So\\v=\frac{1}{2}(at+\frac{2x}{t} ) \\

Substitute the given values

So

v=\frac{1}{2}((3.08m/s^2)(2.93s)+\frac{2(20.8m)}{2.93s} )\\v=11.61m/s

So time required can be calculated by:

t=\frac{v-v_{o}}{a} \\t=\frac{29.4m/s-11.61m/s}{3.08m/s^2}\\ t=5.8s

Required time t=5.8s

You might be interested in
Drag the item from the item bank to its corresponding match.
tigry1 [53]
1- first law
2- third law
3- first law
4- second law
5- third law
6- second law
3 0
3 years ago
Read 2 more answers
A 1.0-kg ball has a velocity of 12 m/s downward just before it strikes the ground and bounces up with a velocity of 12 m/s upwar
Nezavi [6.7K]

Answer:

The change in momentum of the ball is 24 kg-m/s  

Explanation:

It is given that,

Mass of the ball, m = 1 kg

Initial velocity of the ball, u = -12 m/s (in downwards)

Final velocity of the ball, v = +12 m/s (in upward)

We need to find the change in momentum of the ball.

Initial momentum of the ball, p_i=mu=1\ kg\times (-12\ m/s)=-12\ kg-m/s

Final momentum of the ball, p_f=mv=1\ kg\times (12\ m/s)=12\ kg-m/s

Change in momentum of the ball, \Delta p=p_f-p_i

\Delta p=12-(-12)=24\ kg-m/s

So, the change in momentum of the ball is 24 kg-m/s. Hence, this is the required solution.

3 0
3 years ago
A displacement vector has a magnitude of 810 m and points at an angle of 18° above the positive x axis. what are the x and y sca
Naily [24]
I attached my work and highlighted my answers. Hope it makes sense! please comment back with any questions if anything is still unclear! :)

5 0
3 years ago
If a woman weighs 125 lb, her mass expressed in kilograms is x kg, where x is
adelina 88 [10]
The first thing you should know to solve this problem is the conversion of pounds to kilograms:
 1lb = 0.45 Kg
 We can solve this problem by a simple rule of three
 1lb ---> 0.45Kg
 125lb ---> x
 Clearing x we have:
 x = ((125) / (1)) * (0.45) = 56.25 Kg.
 Answer
 her mass expressed in kilograms is 56.25 Kg.
3 0
3 years ago
Read 2 more answers
1. Set frequency of wave generator to 5Hz.
ivann1987 [24]

Separate the barriers so they have a 2cm gap between them.

3 0
3 years ago
Other questions:
  • According to Auto Week magazine, a Chevrolet Blazer traveling at 60 mph (97 km/h) can stop in 8 m on a level road. Determine the
    7·1 answer
  • The very bottom of a body of water is called the___ zone
    14·1 answer
  • What is the magnitude of the force, directed parallel to the ramp, that he needs to exert on the crate to get it to start moving
    12·1 answer
  • Earth’s axis slowly but continuously points in different directions. True or False
    8·1 answer
  • What planet has the most visible rings
    9·2 answers
  • The direction that an induced current flows in a circuit is given by
    11·1 answer
  • The force of gravity acting upon an object is the objects mass. True or false
    6·1 answer
  • Which is observed globally: "Earth Day" or "Arbor Day"?
    13·2 answers
  • A ball is thrown from the top of a 15.0 m tall building. The ball is initially released with a speed of 25.0 m/s in the directio
    5·1 answer
  • At t = 0 the switch S is closed with the capacitor uncharged. If C = 50 F,  = 20 V, and R = 4.0 k, what is the charge on the
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!