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2 years ago

I NEED THE RIGHT ANSWER ASAP NO LINKS !!! This is a Science question

Physics

2 answers:

sdas [7]2 years ago

8 0

3rd number line -5- -4 is -9
also it’s math not physics or science

Ksenya-84 [330]2 years ago

7 0

Answer:

it's actually the first one

Explanation:

-5-(-4) = -1

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Give reason Pascal is a derived unit

Stells [14]

Answer:

Pascal is a derived unit because it cannot be expressed in any physics terms, but it is an expression of fundamental quantities.

Explanation:

${ \sf{Pasacal \: ( Pa) = \frac{newtons}{metres {}^{2} } }} \\ \\ { \sf{Pasacal \: (Pa) = \frac{kg \times {ms}^{ - 2} }{ {m}^{2} } }}$

4 0

3 years ago

What side of the worm faces up when placed in the tray when dissection?

Lelechka [254]

The side of the worm that faces up when placed in the tray for dissection is the smoother side.

You can observe the organs of these tiny creatures by dissecting a preserved earthworm. In dissecting a worm, lay the worm on your dissecting tray with its dorsal side facing up.

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3 years ago

If the phase angle for a block–spring system in SHM is ϕ and the block's position is given by x = xm cos(ωt + ϕ), what is the ra

matrenka [14]

Explanation:

The given position of block x = x₀ cos(ωt + φ)

The velocity of block v = dx/dt = - x₀ sin(ωt + φ) x ω

The kinetic energy = 1/2 mv² = 1/2 m x₀² sin²(ωt + φ) x ω²

The potential energy of spring = 1/2 k x² , where k is the spring constant

Thus P.E = 1/2 x k x x₀² cos²(ωt + φ)

When t = 0

K.E = 1/2 m x₀²sin²φ x ω²

P.E = 1/2 k x₀² cos²φ

Dividing these , we have

K.E/P.E = m/k tan²φ x ω²

7 0

2 years ago

The students observe that the pitches of the sounds from the fire truck and the

Blababa [14]

So, option 3 or the ambulance sound waves have more waves and shorter wavelength is the correct reason for ambulance siren having higher pitch compared to fire truck siren

Explanation:

Pitch of any sound wave is determined as the clarity in frequency of notes or the number of times a cycle is repeated for a single second. So pitch is similar to frequency. And frequency is the measure of number of complete cycles in a second. So if the ambulance siren has higher pitch compared to siren of fire truck. Then this means the frequency of ambulance siren is greater than the fire truck siren. As the frequency is more, then from the given options, choice 3 is correct. The ambulance siren have more waves and shorter wavelength. As more the frequency or number of waves, lesser or shorter is the wavelength of sound wave from ambulance.

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2 years ago

Must new substances be formed when you observe a chemical property? Explain

castortr0y [4]

Yes. It is rather a natural phenomenon. If you search and understand the process of chemical change or reaction that results to its chemical property outcome, it has a new formed substance. Unlike physical change or reaction it only changes in shape or form but the substance, compound or element in the matter is till the same. Furthermore, when chemical change is undergoing you notice the change in shape, size and from like the physical change but there is a change in the element, compound or substance. When you lit a fire on a paper the fire disorients, disorganizes and disturb the former positions of the atoms and because of the fire as catalyzer the atoms did its behavior –changing both intrinsic and extrinsic.

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2 years ago