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3 years ago

Why are bridges built with joints in them?

Physics

2 answers:

Gala2k [10]3 years ago

8 0

Answer:

To provide flexibility in the structure to expand and contract temperature variation; also designed to accommodate movement between structures

Ivenika [448]3 years ago

5 0

Joints are essential to provide flexibility in the structure
Also designed to accommodating movement between structures

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an object has a displacement of + 12 m in 6 seconds if the average velocity is found using the equation change in position / ela

rosijanka [135]

Answer:

+2m/s

Explanation:

average velocity = displacement traveled / total time taken

= +12m/ 6s

= +2 m/s

6 0

3 years ago

One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C, exhau

suter [353]

Answer:

actual efficiency is 47.78 %

Carnot efficiency is 67.65 %

power output is 5.20 × 10^3 hp

Explanation:

given data

temperature = 1900°C = 1900+ 273 K = 2173 K

exhaust temperature = 430°C = 430 + 273 K = 703 K

fuel = 7.0 × 10^9 cal

work = 1.4 × 10^10 J

to find out

actual efficiency and Carnot efficiency and power output of engine

solution

first we find actual efficiency that is = work / heat input

put the value and

input energy = 7.0 × 10^9 cal (4.184 J/1 cal) = 29.29 × 10^9 J

actual efficiency = 1.4 × 10^10 / ( 29.29 × 10^9 )

actual efficiency = 0.4778

actual efficiency is 47.78 %

and

Carnot efficiency is = 1 - ( 703 / 2173 )

so Carnot efficiency is = 0.67648

Carnot efficiency is 67.65 %

and

power output = work / time

power output = 1.4 × 10^10 / 3600 sec

power output = 3.88 × 10^6 W

power output = 3.88 × 10^6 W / 746 hp

so power output is 5.20 × 10^3 hp

5 0

3 years ago

1) if you could eliminate one item from your diet to improve your heath, what would it be?

Makovka662 [10]

Answer:

Rice

Explanation:

Because I can't control eating lots of rice

3 0

3 years ago

Read 2 more answers

Is this true or false a seismograph records the air movements caused by sseismic waves

olasank [31]

The answer to this question is False.

6 0

3 years ago

The velocity of a car doubles over a short period of time. Which additional information is sufficient to determine the amount of

Rom4ik [11]

Answer:

Time and velocity

Explanation:

The time taken for the velocity to double is very important to find the amount of acceleration the car acquires.

Acceleration is the rate of change of velocity with time.

Acceleration = $\frac{v -u}{t}$

v is the initial velocity

u is the final velocity

t is the time taken

So, the velocity and time is needed to calculate the value of the acceleration the car undergoes.

4 0

3 years ago