Which instrument is used to measure the length of an object?

Answers

Answer 1

Answer:

Answer:

Ruler. The first tool that can be used to measure length is a ruler. A ruler can be made of metal, wood or plastic. A ruler has linear measurement markings.

Explanation:

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Density is ____ per unit volume.

]Scientists are able to construct valid scientific methods to study the formation of the solar system by beingbiased and religious
impractical and modest
imaginative and original
unreasonable and outdated

Answers

Answer:

The correct answer will be option-imaginative and original.

Explanation:

The study of any natural phenomenon is based on the methods developed by humans. These methods are known as scientific methods as they approach the explanation in a systematic way.

The quest to understand the astronomical perspective-universe, planets and the planetary motions began around 2500 years ago which persists even today.

To understand the solar system researcher has to be a keen observer, imaginative and truthful to the evidence and data recorded. The logical imagination is essential to study the solar system as one is not able to see the far objects. This practicality allowed the researcher to think and rethink over the laws governing the systems.

Thus, option-imaginative and original is the correct answer.

Imaginative and original are the best choices here. I would not say they necessarily result in valid results, though.

One form of energy changes to multiple other formsa. single transformation
b. multiple transformation

Answers

it is multiple transformation

hope it help

Answer:Multiple transformation

Explanation: one form of energy changes to one other form would be a single transformation

al aplicar una fuerza de 2 N sobre un muelle este se alarga 4cm.¿cuanto se alargara si la fuerza es el triple?¿que fuerza tendriamos que hacer para que el alargamiento fuera de 6cm?

Answers

1) 12 cm

2) 3 N

Explanation:

The relationship between force and elongation in a spring is given by Hooke's law:

$F=kx$

where

F is the force applied

k is the spring constant

x is the elongation

For the spring in this problem, at the beginning we have:

$F=2 N$

$x=4 cm$

So the spring constant is

$k=(F)/(x)=(2N)/(4 cm)=0.5 N/cm$

Later, the force is tripled, so the new force is

$F'=3F=3(2)=6 N$

Therefore, the new elongation is

$x'=(F')/(k)=(6)/(0.5)=12 cm$

In this second problem, we know that the elongation of the spring now is

$x=6 cm$

From part a), we know that the spring constant is

$k=0.5 N/cm$

Therefore, we can use the following equation to find the force:

$F=kx$

And substituting k and x, we find:

$F=(0.5)(6)=3 N$

So, the force to produce an elongation of 6 cm must be 3 N.

How much energy is contained in matter with mass of 1 gram (0.001 kilogram)

Answers

The mechanical energy consisting of potential and kinetic energy is:

0.001 x [ (acceleration of gravity x height) + (1/2) (speed)² ] .

You want to know how much [ mc² ] there is in 1 gram of mass.

E = m c² = (0.001) x (3 x 10⁸)² = 9 x 10¹³ joules

That's the energy that a 1,000-watt toaster uses
in 2,852 years of continuous toasting.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Hope that helped!

When using a film camera, what must you do to bring an object into focus?a.move the lens toward or away from the film.
b.close the diaphragm.
c.adjust the speed of the shutter.
d.adjust the angle of the mirror.

Answers

Answer:

a. move the lens toward or away from the film.

Explanation:

Lets discuss the function of different components of the camera

a). Lens : Lens position is set to focus the image on the film as we know that

$(1)/(d_i) + (1)/(d_0) = (1)/(f)$

here we know that position of lens can adjusted by changing the value of distance from object and that will help to focus the image on the film.

b). diaphragm. = It is used to control the intensity of light to enter into the lens so that light is adjusted.

c). speed of the shutter = By changing the speed of shutter we can control the light entering into the lens which can control the brightness of picture

d) Angle of mirror : by adjusting the angle of mirror we can set the orientation of the image that is formed

Answer:

option (A) is correct

Explanation:

To bring the object in focus, you can change the distance between the film and the lens by moving the lens towards or away from the film.

As the lens is used to click the pictures of objects which are placed at different distances from the camera.

By using the lens formula

1 / f = 1 / v - 1 / u

Where, f is the focal length of the lens, u be the distance between lens and the object and v be the distance between image and the lens.

We can say that f is constant and u is constant so, we have to change the value of v that means the distance between the lens and the film to focus the images of the objects on the film.

What type of reaction occurs in the cores of stars to create their tremendous amounts of energy?a. fusion
b. fission
c. physical
d. chemical

Answers

The correct answer is A.

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A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. The capacitor is then disconnected from the battery, without any of the charge leaving the plates.(a) A voltmeter reads 45.0 V when placed across the capacitor. When a dielectric is inserted between the plates, completely filling the space, the voltmeter reads 11.5 V. What is the dielectric constant of this material?(b) What will the voltmeter read if the dielectric is now pulled partway out so it fills only one-third of the space between the plates?