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2 years ago

Your friend claims that weather predictions are just guesses. What would you say to change your friend's mind?

1 answer:

4 0

To change my friends mind, after they've already said weather predictions are just guesses, I would say they are correct, but not only to they use guesses to predict what will happen, but they also, before hand, use atmospheric tools. They then predict from the data collected. They do both.

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What mass of steam at 100°C must be mixed with 119 g of ice at its melting point, in a thermally insulated container, to produce

N76 [4]

Answer: $M=27.92\ gm$

Explanation:

Given

mass of ice $m=119\ gm$

Final temperature of liquid $T_f=57^{\circ}C$

Specific heat of water $c=4186\ J/kg-K$

Latent heat of fusion $L=333\ kJ/kg$

Latent heat of vaporization $L_v=2256\ kJ/kg$

Suppose M is the mass of steam at $100^{\circ} C$

Heat required to melt ice and convert it to water at $57^{\circ}C$

$Q_1=mL+mc(T_f-0)$

Heat released by steam

$Q_2=ML_v+Mc(100-T_f)$

$Q_1$ and $Q_2$ must be equal as the heat gained by ice is equal to Heat released by steam

$Q_1=Q_2$

$\Rightarrow mL+mc(T_f-0)= ML_v+Mc(100-T_f)$

$\Rightarrow M=\dfrac{m[L+c\times T_f]}{L_v+c(100-T_f)}$

$\Rightarrow M=\dfrac{119[333\times 10^3+4186\times 57]}{2256\times 10^3+4186\times (100-57)}$

$\Rightarrow M=119\times 0.2346$

$M=27.92\ gm$

7 0

2 years ago

For years, marine scientist were mystified by sound waves detected by underwater microphones in the Pacific Ocean. These so-call

pychu [463]

Answer:

225 m

Explanation:

$f$ = Frequency of the T wave = 6.8 Hz

$v$ = Speed of sound in seawater = 1530 ms⁻¹

$\lambda$ = Wavelength of the T wave

we know that, frequency, speed and wavelength are related as

$wavelength = \frac{speed}{frequency}$

$\lambda = \frac{v}{f}$

Inserting the values, we get

$\lambda = \frac{1530}{6.8}\\\lambda = 225 m$

7 0

2 years ago

What does the addition of two vectors give you?

kirill [66]

Answer:

D. Resultant Vector

Explanation:

By definition, adding 2 vectors gives a resultant vector

6 0

2 years ago

45 POINTS!!!!

gtnhenbr [62]

The theoretic volume and pressure of a gas at zero Kelvin are zero. Moreover, there is zero kinetic energy present in the gas. This is because at zero Kelvin, none of the particles are moving.

5 0

2 years ago

What is the maximum number of atoms that can be bonded in an ionic bond

Dima020 [189]

A maximum of four bonds can be used between two atoms.

<u>Explanation:</u>

Ionic bond is one of the strongest bond used in chemical reaction where the valence electrons are bonded and shared between the atoms. Sometimes four covalent bonds between two atoms might make them unstable as the bonds are formed in their outermost shell to make them to form or complete a total of 8 in their shell. For example carbon has 3 as maximum.

6 0

2 years ago