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Vikentia [17]
3 years ago
13

A 20,000 kg railroad car is traveling at 5 m/s when it collides and couples with a second, identical car at rest. What is the re

sulting speed of the combined cars?
Physics
1 answer:
PilotLPTM [1.2K]3 years ago
7 0
Ok I don’t know the answer I’m in 5th grade but 2431 is wrong
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A low C (f=65Hz) is sounded on a piano. If the length of the piano wire is 2.0 m and
WITCHER [35]

Answer:

T = 676 N

Explanation:

Given that: f = 65 Hz, L = 2.0 m, and ρ = 5.0 g/m^{2} = 0.005 kg

A stationary wave that is set up in the string has a frequency of;

f = \frac{1}{2L}\sqrt{\frac{T}{M} }

⇒      T = 4L^{2}f^{2}M

Where: t is the tension in the wire, L is the length of the wire, f is the frequency of the waves produced by the wire and M is the mass per unit length of the wire.

But M = L × ρ = (2 × 0.005) = 0.01 kg/m

T = 4 × 2^{2} ×65^{2} × 0.01

   = 4 × 4 ×4225 × 0.01

   = 676 N

Tension of the wire is 676 N.

4 0
3 years ago
Tell me how the temperatures in the tropics, temperate zones, and polar zones are similar and how they are different.
Oksi-84 [34.3K]

Answer:

Hewo My Lovelys!!

Answers are down below!!

Explanation:

The climate region near the equator with warm air masses is known as tropical. In tropical and polar climates, the weather is consistent throughout the year. In temperate zones, the weather is affected by both warm and cold air masses at different times during the year, so the weather changes with the seasons.

Hope this helps!! =3

Have a great day, evening, or night!! <3

6 0
3 years ago
1.) if you are sitting still are you accelerating? How do you know?
castortr0y [4]

yes. gravity is working on you and everything on you.

also earth is rotating


no not in respect ofimmediate surroundings

object could move at constant velocity = no change in either magnitude or direction

change of position "proves" this

5 0
3 years ago
How did scientists determine the age of the ocean floor
Umnica [9.8K]

the layers of rocks, the ancient treasures that are at the bottom of the sea, how old the coral is. But I don't think they determined how old it is, how would the dinosaurs that lived in water swim or any drink water. I don't know if this helps but hopefully it does. Also scientist have made advanced tech that could help with the age determination of the ocean floor.


6 0
3 years ago
Read 2 more answers
An electron and a proton have the same kinetic energy and are moving at speeds much less than the speed of light. Determine the
morpeh [17]

Answer:

The ratio of the Broglie wavelength of an electron to that of the proton is 42.85.

Explanation:

let λe be the Broglie wavelength of the electron and λp be the Broglie wavelength of the proton, Me be the mass of the electron and Mp be the mass of the proton. let h be the Planck constant, Kep be the kinetic energy of the proton and KEe be the kinetic energy of the electron

4 0
3 years ago
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