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3 years ago

How do scientists define matter

Physics

2 answers:

melisa1 [442]3 years ago

8 0

Scientists define matter as anything that has mass.

KatRina [158]3 years ago

4 0

Anything that is made up of atoms.

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Light of wavelength 633 nm falls on a single slit 0.5 mm wide and forms a diffraction pattern on a screen 1.0 m away from the sl

andrey2020 [161]

Answer:

The position of the first dark spot on the positive side of the central maximum is 1.26 mm.

Explanation:

Given that,

Wavelength of light is 633 nm.

Slit width, d = 0.5 mm

The diffraction pattern forms on a screen 1 m away from the slit. We need to find the position of the first dark spot on the positive side of the central maximum.

For destructive interference :

$\dfrac{dY}{D}=n\lambda$

Y is the distance of the minima from central maximum

Here, n = 1

$Y=\dfrac{n\lambda D}{d}\\\\Y=\dfrac{1\times 633\times 10^{-9}\times 1}{0.5\times 10^{-3}}\\\\Y=0.00126\ m\\\\Y=1.26\times 10^{-3}\ m\\\\Y=1.26\ mm$

So, the position of the first dark spot on the positive side of the central maximum is 1.26 mm.

4 0

3 years ago

A person is standing on a level floor. His head, upper torso, arms, and hands together weigh 496 N and have a center of gravity

Mandarinka [93]

Answer: 1.09 m

Explanation:

Given

Weight of the body, W1 = 496 N

Weight of his upper legs, W2 = 199 N

Weight of his lower legs, W3 = 81.2 N

Center of gravity of the body, y1 = 1.37 m

Center of gravity of the upper legs, y2 = 0.711 m

Center of gravity of the lower legs, y3 = 0.284 m

Center of gravity relative to the floor, y(f) = ?

y(f) = (W1y1 + W2y2 + W3y3) / (W1 + W2 + W3), substituting the values, we have

y(f) = [(496 * 1.37) + (199 * 0.711) + (81.2 * 0.284)] / (496 + 199 + 81.2)

y(f) = (679.52 + 141.489 + 23.0608) / 776.2

y(f) = 844.0698 / 776.2

y(f) = 1.09 m

3 0

3 years ago

What is the name of the units that are normally used to measure energy?

Sati [7]

The basic unit of energy is a joule. Kill calories measure the energy available in food.

8 0

3 years ago

Suppose you increase your walking speed from 6 m/s to 13 m/s in a period of 1 s. What is your acceleration? m/s2

ziro4ka [17]

Average acceleration is
Change in Velocity/change in time
So you could then do Vf-Vi/Tf-Ti
Which would look like 13m/s-6m/s / 1s-0s
Which then is 7m/s/1s which means the acceleration is 7m/s^2

5 0

3 years ago

A hard rubber rod is rubbed with wool and thus gains an approximately uniform net negative charge. The rubber rod is then suspen

grandymaker [24]

Answer:

The acrylic rod gains a net negative charge by coming in contact with the hard rubber rod. This is because when brought in contact with the rubber rod some of the excess electrons which are responsible for the negative charge on the rubber rod gets deposited on the acrylic material. Electrons generally will be deposited more on a body where there is more space to accommodate them. So the magnitude of charge that gets deposited on the acrylic material depends on the free sites available to the incoming electrons.

Explanation:

When the rubber rod is scrapped the net charge on the rubber rod changes to positive or negative depending on if it is gaining or loosing electrons. The act scrapping happens because of friction and friction causes transfer of charges between two different materials. The material that loses electronic gains a net positive charge and the material that accepts gains a net negative charge.

4 0

3 years ago