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4 years ago

Which two elements have the same number of valence electrons?

Physics

2 answers:

soldi70 [24.7K]4 years ago

5 0

The answer is Cl and f.
They belong to group halogens and have 7 valence electrons in their valence shell

UNO [17]4 years ago

4 0

Answer:

The answer is A. C and O..

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A car turns from a road into a parking lot and into an available parking space. The car's initial velocity is 4 m/s [E 45° N]. T

melamori03 [73]

Answer:

Explanation:

From the given information:

The car's initial velocity = 4 m/s in the direction of east 45° due north

We can therefore express the vector of this component form as:

v₁ = (4 m/s) (cos(45º)i + sin(45º)j)

v₁ = (2.83 m/s)i + (2.83 m/s)j

Similarly, the car's final velocity = 4 m/s in the direction of the east side 10º north

∴

v₂ = (4 m/s) (cos(10º) i + sin(10º) j)

v₂ = (3.94 m/s) i + (0.695 m/s) j

From the first equation of motion

v = u + at

Making acceleration "a" the subject of the formula, we have:

a = (v - u )/t

a = (v₂ - v₁)/t

a = (0.370 m/s²) + (-0.711 m/s²)

The magnitude of the avg. acceleration is:

$|| a||= \sqrt{(0.370 m/s^2)^2 + (-0.711 m/s^2)^2)$

$|| a||= 0.8015 \ m/s^2$

And;

The direction can be determined by taking the tangent of the acceleration:

i.e.

$tan(\theta) = \dfrac{-0.711 m/s^2}{ 0.370 m/s^2}$

$tan(\theta) = -1.9216$

$\theta = tan^{-1} ( -1.9216 )$

$\mathbf{\theta = -62.51 ^0}$

Thus, the direction of the angle is approximately S 62.51º E

7 0

3 years ago

In order to increase thermal energy, the temperature must ___________.

Anni [7]

In order to increase thermal energy, the temperature must <span>increase</span>

5 0

3 years ago

Read 2 more answers

Green light (λ = 518 nm) strikes a single slit at normal incidence. What width slit will produce a central maximum that is 3.00

MariettaO [177]

Answer:

6.9066 × 10⁻⁵ m

Explanation:

For constructive interference, the expression is:

$d\times sin\theta=m\times \lambda$

Where, m = 1, 2, .....

d is the distance between the slits.

The formula can be written as:

$sin\theta=\frac {\lambda}{d}\times m$ ....1

The location of the bright fringe is determined by :

$y=L\times tan\theta$

Where, L is the distance between the slit and the screen.

For small angle , $sin\theta=tan\theta$

So,

Formula becomes:

$y=L\times sin\theta$

Using 1, we get:

$y=L\times \frac {\lambda}{d}\times m$

Thus, the distance between the central maximum is 3.00 cm

First bright fringe , m = 1 occur at 3.00 / 2 = 1.50 cm

Since,

1 cm = 0.01 m

y = 0.0150 m

Given L = 2.00 m

λ = 518 nm

Since, 1 nm = 10⁻⁹ m

So,

λ = 518 × 10⁻⁹ m

Applying the formula as:

$0.0150\ m=2.00\ m\times \frac {518\times 10^{-9}\ m}{d}\times 1$

<u>⇒ d, distance between the slits = 6.9066 × 10⁻⁵ m</u>

7 0

3 years ago

water is boiling in a pan at 100c if heat is transferred to the pan at a rate of 2 kw how much water in kg will evaporate in 10m

Ksju [112]

Answer:

The mass of water that will evaporate 2.857 kg.

Explanation:

Given;

temperature of the water, T = 100 c

rate of heat transfer, H = 2 kW = 2000 w

time, t = 10 min = 10 min x 60s = 600s

heat capacity of water is given by;

Q = McΔT

Where;

Q is the quantity of heat transfer to the pan = P x t = 2000 x 600 = 1200000 J.

c is specific heat capacity of water = 4200 J/kg.°C

m = (Q) / (cΔT)

m = (1200000) (4200 x 100)

m = 2.857 kg

Therefore, the mass of water that will evaporate 2.857 kg.

6 0

3 years ago

If a body with a mass of 4 kg is moved by a force of 20 N, what is the rate of its acceleration?

valentina_108 [34]

Explanation:

F = ma

20 N = (4 kg) a

a = 5 m/s²

8 0

3 years ago