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2 years ago

What is newtons first,second, and third law?

1 answer:

6 0

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. .

Newton's third law: All forces in the universe occur in equal but oppositely directed pairs.

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How many electrons are depicted in the electron dot diagram of an electrically neutral nitrogen atom? A. two B. six C. eight D.

goldenfox [79]

Answer is D - five.

<em>Explanation;</em>

- Electron dot diagrams show the valence electrons around the element by using dots.

- Valence electrons are the electrons which are in outermost shell of the atom.

-The atomic number of the N atom is 7.

Atomic number = number of protons = 7

If the atom is neutral,

number of protons = number of electrons.

Hence, N atom has 7 electrons.

- The electron configuration is 1s² 2s² 2p³.

Hence, N atom has 2 + 3 = 5 valence electrons. So, five electrons are represented in electron dot diagram of N.

4 0

3 years ago

Read 2 more answers

Explain how the plants of a tropical rain forest contribute to the characteristic hot, humid weather associated with the area. U

Talja [164]

Answer: The atmosphere of trophic rainforest is hot and humid due to high rate of transpiration.

Explanation:

The tropical rainforest is a biome which exhibit rich biodiversity of plants and animals. The average temperatures in this region remain high with warm summer. It remains frost free. The soil is nutrient deficient. Due to hot temperature the rate of transpiration remains high as a result the concentration of the water vapors remain high. This is responsible for increasing the humidity in the atmosphere also this region receives appreciable amount of rainfall annually. The average rainfall range is 200-450 centimeters.

6 0

2 years ago

A rock is suspended by a light string. When the rock is in air, the tension in the string is 51.9 N . When the rock is totally i

Luden [163]

Answer:

$\rho _{liquid}=1995.07kg/m^{3}$

Explanation:

When the rock is immersed in unknown liquid the forces that act on it are shown as under

1) Tension T by the string

2) Weight W of the rock

3) Force of buoyancy due to displaced liquid B

For equilibrium we have $T_{3}+B = W_{rock}$

$T_{3}+\rho _{Liquid}V_{rock}g$ = $W_{rock}.....(\alpha)$

When the rock is suspended in air for equilibrium we have

$T_{1}=W_{rock}....(\beta)$

When the rock is suspended in water for equilibrium we have

$T_{2}$ + $\rho _{water}V_{rock}g$ = $W_{rock}.....(\gamma)$

Using the given values of tension and solving α,β,γ simultaneously for $\rho _{Liquid}$ we get

$W_{rock}=51.9N\\31.6+1000\times V_{rock}\times g=51.9N\\\\11.4+\rho _{liquid}V_{rock}g=51.9N\\\\$

Solving for density of liquid we get

$\rho _{liquid}=\frac{51.9-11.4}{51.9-31.6}\times 1000$

$\rho _{liquid}=1995.07kg/m^{3}$

5 0

2 years ago

Gladiators of Physics Plz Help On This Question. Steps will help! with formula

arsen [322]

Simplified gravitational potential energy:
v = mgh

m mass
g gravitational acceleration, on earth = 9.81m/s²
h height

Solve for height.

8 0

3 years ago

A dentist using a dental drill brings it from rest to maximum operating speed of 391,000 rpm in 2.8 s. Assume that the drill acc

krek1111 [17]

Answer:

$\alpha = 2327.7 \ rev/s^2$

$\theta = 9124.5 \ rev$

Explanation:

From the question we are told that

The maximum angular speed is $w_{max} = 391000 \ rpm = \frac{2 \pi * 391000}{60} = 40950.73 \ rad/s$

The time taken is $t = 2.8 \ s$

The minimum angular speed is $w_{min}= 0 \ rad/s$ this is because it started from rest

Apply the first equation of motion to solve for acceleration we have that

$w_{max} = w_{mini} + \alpha * t$

=> $\alpha = \frac{ w_{max}}{t}$

substituting values

$\alpha = \frac{40950.73}{2.8}$

$\alpha = 14625 .3 \ rad/s^2$

converting to $rev/s^2$

We have

$\alpha = 14625 .3 * 0.159155 \ rev/s^2$

$\alpha = 2327.7 \ rev/s^2$

According to the first equation of motion the angular displacement is mathematically represented as

$\theta = w_{min} * t + \frac{1}{2} * \alpha * t^2$

substituting values

$\theta = 0 * 2.8 + 0.5 * 14625.3 * 2.8^2$

$\theta = 57331.2 \ radian$

converting to revolutions

$revolution = 57331.2 * 0.159155$

$\theta = 9124.5 \ rev$

6 0

2 years ago