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
Sergeeva-Olga [200]
3 years ago
10

The first international standard of length was a metal bar kept at the International Bureau of Weights and Measures. One meter o

f length was defined to be the distance between two fine lines engraved near the ends of the bar. Why was it important that the bar be kept at a constant temperature?
Physics
1 answer:
anyanavicka [17]3 years ago
7 0

Answer:

International Bureau of Weights and Measures have the standard bar for one meter length and it is made up of the platinium-iridium alloy. As these are metals so they have the thermal expansion. So the length of the bar depends upon the temperature. Temperature changes can effect the length of the standard bar. That's reason behind keeping the bar at the constant temperature as the change in temperature will result in the change of length.

You might be interested in
An electric motor rotating a workshop grinding wheel at a rate of 151 rev/min is switched off. Assume constant angular decelerat
tamaranim1 [39]

Answer:

Explanation:

Initial angular velocity ω₀ = 151 x 2π / 60

= 15.8  rad /s

final velocity = 0

Angular deceleration α = 2.23 rad / s

ω² = ω₀² -  2 α θ

0 = 15.8² - 2 x 2.23 θ

= 55.99  rad

one revolution = 2π radian

55.99 radian = 55.99  / 2 π no of terns

= 9 approx .

8 0
3 years ago
How long did it take our planet to produce the fossil fuels we're using today?
Vesna [10]

Answer:

It takes millions sometimes hundreds of millions Explanation:

3 0
2 years ago
Read 2 more answers
Which wave has a wavelengh that is most likely seen as red light?
goblinko [34]

Answer:

D.

Explanation:

Red light has wavelengths around 620 to 750 nm.

7 0
3 years ago
Read 2 more answers
What is a force that opposes motion between two surfaces that are in contact?
choli [55]

Answer:

Friction is a force that opposes motion.

8 0
3 years ago
A ray diagram is shown.
alexandr402 [8]

Answer:

  Z

Explanation:

The purple and yellow rays from the same point on the object are shown converging at point Z, where the image will be.

7 0
3 years ago
Other questions:
  • It turns out that Mercury and Mars have the same gravity as one another – that is, you would weigh the same on the surface of Me
    15·1 answer
  • In Rutherford's experiment, which of the following proved that the
    6·1 answer
  • A child walks 5.0 meters north, then 4.0 meters east, and finally 2.0 meters south. what is the magnitude of the resultant displ
    14·2 answers
  • Look at the picture of a person about to get the soccer ball. Then drag and drop the pins to correctly complete newtons second l
    14·1 answer
  • An antigen is a protein made by your body to respond to a specific foreign molecule.
    14·1 answer
  • Sound waves require a medium to travel through, such as a solid, liquid or gas because
    5·2 answers
  • Emma is working in a shoe test lab measuring the coefficient of friction for tennis shoes on a variety of surfaces. The shoes ar
    10·1 answer
  • A steel bar that is at 10 ° c is 5 meters long, a bar for heated to 120 ° c, how long is that bar? Α = 1.2.10- ° c
    13·1 answer
  • What is the term for the matter through which a mechanical wave travels?
    7·1 answer
  • I need HELP ASAP please!!!
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!