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luda_lava [24]
3 years ago
8

1- O telhado de um grande galpão mede 40 m por 75 m e é feito de zinco, cujo coeficiente de dilatação térmica linear vale 3.10^-

5 oC^-1 . Ao sofrer uma elevação de temperatura de 25oC em um dia de forte calor, qual o valor da dilatação superficial do telhado? E esse aumento da área do telhado foi de um valor próximo ao da área: a) de um cartão de crédito/débito de um banco; b) de uma folha de papel sulfite; c) do tampo de uma mesa de janta; d) de uma quadra de futsal. 2 - Um cubo metálico de aresta 20 cm a 0oC, após um aquecimento uniforme, tem sua temperatura elevada em 500oC e a medida da sua aresta aumenta em 1% . Com essas informações, determine: a) a dilatação volumétrica, em cm3, sofrida pelo cubo; b) o coeficiente de dilatação volumétrico do material do cubo; c) o coeficiente de dilatação térmica linear do material do cubo.
Physics
1 answer:
Minchanka [31]3 years ago
7 0

Answer:q

Explanation:

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An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far
KIM [24]

Answer:

40 N

Explanation:

The gravitational force between the asteroid and the spaceship is given by:

F=G\frac{mM}{R^2}

where

G=6.67\cdot 10^{-11} m^3 kg^{-1} s^{-2} is the gravitational constant

M is the mass of the asteroid

m is the mass of the spaceship

R is the distance between the asteroid and the spaceship

The initial force is equal to:

F=G\frac{mM}{R^2}=360 N

Later, the spaceship moves to a position 3 times as far from the center of the asteroid, so R' = 3R. Therefore, the new force will be

F'=G\frac{mM}{R'^2}=G\frac{mM}{(3R)^2}=G\frac{mM}{9R^2}=\frac{1}{9}F

so, the force is decreased by a factor 9. Since the initial force was F=360 N, the new force will be

F'=\frac{360 N}{9}=40 N

3 0
4 years ago
What is the difference between a scalar and vector quantity? Give an example of each
Mkey [24]
<span>Scalar quantity: one dimensional measurement of a quantity, like temperature, or mass. Vector: more than one number associated with it. Ex: Displacement, speed, velocity.</span>
5 0
3 years ago
Mona's grandfather had been complaining of poor vision for many days. One day Mona took him to the eye specialist and got his ey
Ostrovityanka [42]

Answer:

The problem with her grandfather's eye can be long sightedness and short sightedness

Explanation:

Given that,

Mona's grandfather had been complaining of poor vision for many days.

We know that,

Refractive eye surgery is small surgery.

We need to find the problem with her grandfather's eye

Using given data,

Mona's grandfather had been complaining of poor vision for many days.

So, the doctor did refractive eye surgery of her grandfather's eye.

Due to this surgery, Mona's grandfather can see things clearly.

Refractive eye surgery is a method for correcting vision.

This surgery used for better vision.

This surgery is possible for long sightedness and short sightedness.

Hence, The problem with her grandfather's eye can be long sightedness and short sightedness

3 0
3 years ago
Hi❤️
Norma-Jean [14]

Answer:

length

Explanation:

used to measure outer dimensions of objects

7 0
3 years ago
Please guide me for uniform speed
tino4ka555 [31]

Explanation:

uniform speed is just the consistent ratio of distance to time. it can a

so be thought as the speed of an object that does not change. an example is when a car moves at a speed of 60km/hrs without changing its speed. it keeps on moving at the same speed it started with

hope this becomes helpful

thanks

8 0
3 years ago
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