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3 years ago

Which statement best describes the importance of joints in the roadways of Bridges ?

Physics

2 answers:

Luden [163]3 years ago

8 0

Answer:

I think the answer is A but I could be wrong but I think the answer is A. please let me know if I am wrong.

jekas [21]3 years ago

8 0

Answer:

c. Joints allow the roadway to expand and contract as cars put force on the bridge

Explanation:

Joints in the roadways of bridges allows for the roadway to expand and contract as cars put force on the bridge.

The force on the bridge and the ambient temperature causes expansion of the materials used in making the bridge.

Joints allows and accommodate the expansion.
As the force is removed and temperature reduces, the road also contracts.

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If a bowling ball rolls 12 meters in 2.2 seconds what is the speed ?

Evgesh-ka [11]

Answer:19000

Explanation:I don’t know

8 0

4 years ago

-Para lograr que una pieza de 0,300 kg de cierto metal aumente su temperatura desde 40°C a 60 °C ha sido necesario suministrarle

marishachu [46]

Answer:

parte a) el calor específico es c = 0.383 J /(gr*K)

parte b) la temperatura inicial es T inicial= 52.72 °C

Explanation:

para el primer punto la formula para el calor Q es:

Q = m * c * ( T final - T inicial )

donde

m= masa de la pieza = 0.300 kg = 300 gr

Q = flujo de energía en forma de calor= 2299 J

c = calor específico

T final = temperatura final =40°C

T inicial = temperatura inicial = 60 °C

entonces

Q = m * c * ( T final - T inicial )

c = Q / [ m* ( T final - T inicial ) = 2299 J/[ 300 gr * ( 60 °C - 40°C )]

= 0.383 J /(gr*K)

c = 0.383 J /(gr*K)

para el segundo punto usamos la misma formula

Q = m * c * ( T final - T inicial )

pero

m= 200 gr= 0.200 kg

c=459.8 J/(kg*K) , Q =20.900 J , T final = 280 °C

Q = m * c * ( T final - T inicial )

T inicial = T final - Q/(m*c) =280 °C - 20.900 J/(459.8 J/(kg*K)* 0.200 kg) = 52.72 °C

7 0

4 years ago

While drilling metal, Ben poured oil over the area, which best explains why he did this ?

Hoochie [10]

Ben was trying to <span>increase fluid friction. </span>

8 0

3 years ago

Read 2 more answers

A stack of books whose true weight is 165 N is placed on a scale in an elevator. The scale reads 165 N. Can you tell from this i

Inga [223]

Answer:

D) not enough information to decide

Explanation:

Data provided in the question

The True weight of book stacks = 165 N

Reading of the scale = 165 N

Constant velocity = 2 m/s upward or downward

Based on the above information

If you moved at a constant velocity the scale interprets the same because of the momentum you've got. The scale will change the number only when acceleration is present.

Therefore in the given situation, the option D is correct as it not have enough information for deciding it

8 0

3 years ago

While a block slides forward 1.35 m, a force pulls back at a 135 direction, doing -17.8 J of work. what is the magnitude of the

Verdich [7]

The magnitude of the force is 18.6 N

Explanation:

The work done by a force on an object is given by

$W=Fd cos \theta$

where

F is the magnitude of the force

d is the displacement of the object

$\theta$ is the angle between the direction of the force and of the displacement

For the block in this problem, we have

$W=-17.8 J$ is the work done

d = 1.35 m is the displacement of the block

$\theta=135^{\circ}$ is the angle between the force and the displacement

Solving for F, we find the magnitude of the force:

$F=\frac{W}{d cos \theta}=\frac{-17.8}{(1.35)(cos 135)}=18.6 N$

Learn more about work here:

brainly.com/question/6763771

brainly.com/question/6443626

#LearnwithBrainly

8 0

4 years ago