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3 years ago

Help me plzzzz

Physics

2 answers:

Vinil7 [7]3 years ago

6 0

Answer:

C. Mg3N2

How I Know :

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KiRa [710]3 years ago

4 0

Answer:

C. Mg3N2

Explanation:

Magnesium has a positive 2 charge and nitrogen has a negative 3 charge. To completely balance it out, you need three magnesium’s and two nitrogen’s. The final charge for magnesium would be positive 6 and the final charge for nitrogen would be negative 6, this will make it neutral.

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Answer:

A, C, and D

Explanation:

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3 years ago

A wave has angular frequency 30 rad/s and wavelength 2.0 m. What are its (a) wave number and (b) wave speed

masya89 [10]

Answer:

a) 15 b) 60 i think is the answer

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2 years ago

The mass of a certain neutron star is 2.5x10^30kg and the radius 7000m. what is the force of gravity on a 1kg object of the surf

Makovka662 [10]

Answer:

3.42N

Explanation:

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Use the equation: F = (GMm)/(r^2)

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m = mass2 (1kg)

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Plug it in: F = ((6.7x10^-11)(2.5x10^30)(1)) / (7000^2)

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8 0

3 years ago

When a solid is placed in a container and heat is applied, a phase change occurs. Watch the video and identify which of the foll

goldenfox [79]

Answer:

a) false b) true c) true d) false and e) true

Explanation:

a) false. All the energy applied is used for the phase change, so the temperature remains constant.

b) true. The kinetic energy is associated with the speed of the particles and they have more mobility in the liquid, therefore, more kinetic energy.

c) true. Since energy is used for state change

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4 0

3 years ago

Read 2 more answers

A bell rings at a frequency of 75hz on a warm 25 degree evening. calculate the...

allochka39001 [22]

Answer:

Explanation:

We need 2 different equations for this problem: first the velocity of sound equation, then the frequency of the sound equation.

The velocity of sound is found in:

v = 331.5 + .606T

We need to find that first in order to fill it into the frequency equation which is

$f=\frac{v}{\lambda}$ where v is the velocity we will find the part a, f is frequency and lambda is the wavelength. Starting with the velocity of the sound:

v = 331.5 + .606(25) and

v = 331.5 + 15 and rounding correctly using the rules for sig fig when adding:

v = 347 m/s

Filling that into the frequency equation:

$75=\frac{347}{\lambda}$ and

$\lambda=\frac{347}{75}$ so

$\lambda=4.6m$

7 0

3 years ago