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3 years ago

A what is a negatively charged Atoms

Physics

1 answer:

mr Goodwill [35]3 years ago

7 0

Answer:

Negatively charged or positively charged atom is generally termed as ANION/CATION. Short Explanation: If an atom loses electrons or gains protons, it will have a net positive charge and is called a Cation. If an atom gains electrons or loses protons, it will have a net negative charge and is called an Anion.

Explanation:

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Sirius A has a luminosity of 26 LSun and a surface temperature of about 9400 K.What is its radius?

wlad13 [49]

Answer

Given,

Sirius A surface temperature,T = 9400 K

Sirius A luminosity,L = 26 L₀

L₀ is the luminosity of sun.

Radius of sun = 695700000 m

Temperature on sun surface = 5780 K

Luminous intensity is given by:-

$L=4 \pi R^{2} \sigma T^{4}$

Now

$\frac{L}{L_{0}}=\frac{4 \pi R^{2} \sigma T^{4}}{4 \pi R_{0}^{2} \sigma T_{0}^{4}}=26$

$\Rightarrow \frac{R^{2} T^{4}}{R_{0}^{2} T_{0}^{4}}=26$

$\Rightarrow R^{2}=26 \times \frac{R^{2} T_{0}^{4}}{T^{4}}=26 \times \frac{695700000^{2} \times 5780^{4}}{9400^{4}}$

$R=1341246640\ m=1.34 \times 10^{9}$

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3 years ago

At takeoff, the horizontal and vertical velocity of long jumper are 57.8 m/s and 5.6 m/s respectively. What is the resultant vel

Lady bird [3.3K]

Apply the Pythagorean theorem to get the resultant velocity:

V = $\sqrt{Vx^{2}+Vy^{2}}$

Given values:

Vx = 57.8m/s

Vy = 5.6m/s

Plug in and solve for V:

V = 58.1m/s

EDIT: Let's get the direction of the resultant velocity as well.

This equation will give the angle of the velocity as measured off of the ground:

θ = tan⁻¹(Vy/Vx)

Again, the given values are:

Vx = 57.8m/s

Vy = 5.6m/s

Plug in the values and solve for the angle θ:

θ = tan⁻¹(5.6/57.8)

θ = 5.5°

The resultant velocity is oriented 5.5° off the ground.

5 0

3 years ago

What is the difference between air resistance and friction?

Vladimir [108]

Answer:Friction is a force that opposes the motion of objects; friction can cause objects to slow down. Air resistance is a type of friction. Air resistance causes moving objects to slow down. Different physical properties, such as the shape of an object, affect the air resistance on an object.

Explanation:

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1 year ago

A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the earth’s surface. w

Ksivusya [100]

speed of sound wave depends on elasticity of medium and density of medium

it is given by formula

$v = \sqrt{\frac{E}{/rho}}$

now if wave travel through solid then its speed is maximum while if it travel from gas then its speed is minimum

so initially its speed is given as 4000 m/s and suddenly decrease to 1500 m/s

so here we can say that its medium will change from solid to liquid

<em>so sound will encounter with water </em>

3 0

4 years ago

Read 2 more answers

A tennis ball traveling horizontally at a speed of 40 m/s hits a wall and rebounds in the opposite direction. The time Interval

liubo4ka [24]

Answer

given,

initial velocity of the ball, u = 40 m/s

final velocity of the ball, v= -40 m/s

time of contact = 0.013 s

mass of the ball = 0.059 Kg

a) initial momentum

P₁ = m u = 0.059 x 40 = 2.36 kg.m/s

final momentum

P₂ = m v = 0.059 x (-40) = -2.36 kg.m/s

b) change in momentum

Δ P = P₂- P₁

Δ P = -2.36 - 2.36

Δ P = -4.72 kg.m/s

c) Average force

average force exerted by the ball is equal to change in momentum per unit time.

$F =\dfrac{\Delta P}{t}$

$F =\dfrac{-4.72}{0.013}$

F = -363 N

3 0

4 years ago