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
bearhunter [10]
3 years ago
10

A train whose proper length is 1200 m passes at a high speed through a station whose platform measures 900 m, and the station ma

ster observes that when the train passes it occupies exactly the entire length of the platform. What is the speed of the train?
Physics
1 answer:
TiliK225 [7]3 years ago
6 0

Answer:

0.66c

Explanation:

Use length contraction equation:

L = L₀ √(1 − (v²/c²))

where L is the contracted length,

L₀ is the length at 0 velocity,

v is the velocity,

and c is the speed of light.

900 = 1200 √(1 − (v²/c²))

3/4 = √(1 − (v²/c²))

9/16 = 1 − (v²/c²)

v²/c² = 7/16

v = ¼√7 c

v ≈ 0.66 c

You might be interested in
Find the current in the 12 ohm resistor.
disa [49]

Answer:

1.5 A

Explanation:

V =I.R

18 = I × 12

I = 18/12

= 3/2 = 1.5 A

3 0
3 years ago
How does a steam engine do work?
Viktor [21]
Steam enters a cylinder—- A
4 0
4 years ago
Why do you ask me that’s all me the moon seem like they’re walking on Spring tomorrow on earth we are from your tractor to the g
nataly862011 [7]
The moon is talking to thecat at night that’s why
3 0
3 years ago
Increase the slit width to 1050 nm. What happens to the width of the central bright fringe? (Always remember to wait a few secon
djyliett [7]

Answer:

b.

Explanation:

In case of Single Slit, diffraction will occur.

Then In Single slit Diffraction, width of central fringe is

x_c= 2D\lambda/a


where D= distance b/w screen and slit

a= slit width

\lambda = wavelength

Thus if Screen width increases keeping other factors same then width of central fringe becomes narrower as

x_c\propto 1/a

On increasing the slit width the central bright fringe width The width of the central bright fringe becomes narrower.

3 0
4 years ago
How much is 1.75 inches in cm?
saul85 [17]

Answer:

4.44 cm

Explanation:

:)

3 0
4 years ago
Read 2 more answers
Other questions:
  • If it takes 150 n of force to accelerate an object at 30 m/s what is the mass of the object
    15·1 answer
  • If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the
    5·1 answer
  • 15.0 N object is pulled up an inclined plane at constant velocity. If the inclined plane makes an
    5·1 answer
  • What is the gpe of a 200 kg hot air ballon 21,000 m above the ground?
    13·1 answer
  • A small object carrying a charge of -4.00 nC is acted upon by a downward force of 19.0 nN when placed at a certain point in an e
    12·1 answer
  • Explain a situation in which you can have a positive velocity but a negative acceleration
    11·1 answer
  • The two hot-air balloons in the drawing are 48.2m and 61.0 m above the ground.A person in the left balloon observes that the rig
    5·1 answer
  • Why is charcoal black?
    7·1 answer
  • In a “minute to win it” game, cards are placed between cups to stack them. The contestant then pulls the card out in hopes that
    9·2 answers
  • DESPERATE!! WILL GIVE BARINLIST AND THANKS
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!