Why are there only two elements in the first period of the periodic table?(1 point)

because the first two elements both start with H and are grouped together

because the next elements have other things in common and they need to be arranged together

because each row increases in atomic mass by a specific number, so anything over five is in the second row

because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits

Explanation:

A resultant force is the sum of the forces on an object.

Forces are said to be in equilibrium when the resultant force is zero. This means the object will not accelerate.

Answer:

the time taken by the car to travel 160 m = 160/8= 20 s

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Answer:

hmmm i dont know....

Explanation:

i just wanted free point. TANKS YOU SIR!!

Answer:

i.

[tex]a = \frac{(v - u)}{t} \\ v - u = at \\ v = at + u[/tex]

ii.

[tex]a = \frac{(v - u)}{t} \\ v - u = at \\ u = v - at[/tex]

iii.

[tex]a = \frac{(v - u)}{t} \\ ta = v - u \\ t = \frac{(v - u)}{a} [/tex]

I hope I helped you^_^

Answer:

Answer:

Earth is the only known planet to have bodies of liquid water on its surface. Europa is thought to have subsurface liquid water. ... Evidence points to water on other planets in our solar system. In 2015, NASA confirmed that liquid water flows intermittently on present-day Mars

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Answer:

To change 150x106 km to scientific notation, the leading number must be reduced to a  

number between 1 and 9.99999.... To do this, one must dDIVIDE by 100, yielding 1.50.  

In order to keep the entire quantity the same, one must then MULTIPLY the exponential  

part of the number of 100. This is equivalent to increasing the exponent from 6 to 8.

Explanation:

hope this helps

Fun Fact: A cow-bison hybrid is called a “beefalo”

Answer:

it equals 53 miles per hour

Explanation:

[tex]thank \: you[/tex]

Answer:

MASS

Explanation:

mass is the quantity of matter contained in the body.

Answer:

I do not own this picture inserted below. Credits to the rightful owner. But i hope this help you <3

Since the body is moving with uniform velocity, its velocity after it travels 100 m in 20 s is 15 m/s.

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Answer:

it's true...

Explanation:

hope it helps you

Answer:

C . 3.75 Ohms

Explanation:

V = IR

R = V / I

From the graph, you pick a value for potential difference and find its corresponding current.

The resistance of the wire in Ohms is 3.75 Ω, therefore the correct answer is option C

Resistance is the obstruction of electrons in an electrically conducting material.

The mathematical relation for resistance can be understood with the help of the empirical relation provided by Ohm's law.

V=IR

where V is the voltage

I is the current

From the voltage-current  graph, one can know the resistance by calculating the slope of the graph

As shown in the graph the variation of the voltage with the current

Y axis represents the voltage and the X axis represents the current

slope = variation in the Y coordinate /variation in the X coordinate

resistance = variation in the voltage /variation in the current

                 = (30 - 0 )/ (8-0 )

                 = 3.75 Ω

Thus, by observation and calculation from the graph, the resistance of the wire comes out to be 3.75 Ω

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We have that

The wombats total displacement is

[tex]d_t=2100m[/tex]

The average velocity during that time is

[tex]v_{avg}=5m/s[/tex]

From the question we are told that:

initial Velocity [tex]V_1=5m/s[/tex]

initial Time [tex]T_1=4min=>240sec[/tex]

Final Velocity [tex]V_2=4m/s[/tex]

Final time  [tex]T_2=3min=>180sec[/tex]

a)

Generally, the equation for displacement is mathematically given by

d_t=(Initial +final) displacement

Where

initial displacement

[tex]d_1=V_1*t_1\\\\d_1=5*240[/tex]

[tex]d_1=1200m[/tex]

Final displacement

[tex]d_2=V_2*t_2\\\\d_2=5*180[/tex]

[tex]d_2=900m[/tex]

Therefore

[tex]d_t=(Initial +final) displacement[/tex]

[tex]d_t=1200+900[/tex]

[tex]d_t=2100m[/tex]

b)

Generally, the equation for Average velocity is mathematically given by

[tex]v_{avg}=\frac{d_t}{t_1+t_2}[/tex]

[tex]v_{avg}=\frac{2100m}{240+180}[/tex]

[tex]v_{avg}=5m/s[/tex]

in conclusion

The wombats total displacement is

[tex]d_t=2100m[/tex]

The average velocity during that time is

[tex]v_{avg}=5m/s[/tex]

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Answer:

The sun is considered as the main source of energy since it is the source of nearly all the earth's energy. Plants produce food using sunlight, and the food we get from plants and animals also has its primary sunlight source.

Hoped it helps you.

Answer:

It is because it supplies most of our energy that we use today, directly or indirectly. It radiates light and heat or solar energy, which makes it possible to exist life on earth.

Answer:

D is the answer

Explanation:

6.45×7.44= 47.98800

Which if we round of we get 48m

Answer:

Explanation:

When you put another light bulb in parallel with the other two, you are not going to get something for nothing. The current drain on the battery has to go up.

Let the lightbulbs have a a resistance of r. Two light bulbs with make the resistance go to 1/2 r. The lower the resistance, the more the current. When you put the third light bulb in, the resistance will go to 1/3 r.  So the current goes up.

If you put another resistor in series with x, the resistance adds. The total series resistance is 2x. The current reading will go down. The higher the resistance the lower the current.

Here are some basic SI units .

Explanation:

(1) Every object moves in a straight line unless acted upon by a force. (2) The acceleration of an object is directly proportional to the net force exerted and inversely proportional to the object's mass. (3) For every action, there is an equal and opposite reaction.

Explanation:

when the object is between the pole and focus

Using 3rd equation of kinematics

[tex]\\ \rm\longmapsto v^2-u^2=2as[/tex]

[tex]\\ \rm\longmapsto s=\dfrac{v^2-u^2}{2a}[/tex]

[tex]\\ \rm\longmapsto s=\dfrac{30^2-15^2}{2(5)}[/tex]

[tex]\\ \rm\longmapsto s=\dfrac{900-225}{10}[/tex]

[tex]\\ \rm\longmapsto s=\dfrac{675}{10}[/tex]

[tex]\\ \rm\longmapsto s=67.5m[/tex]

Relative motion means a motion relative to a reference point. We can also say, relative motion means motion referred or observed from a reference point.

For example, Alex is in a train and Ace is at the station, when the train starts moving, for Ace it is moving at a speed of 10 m/s, but for Alex it is moving at 0 m/s, or we can say that it is at rest for Alex, but in motion for Ace. This is relative motion.

Answer:

relative motion is the motion of an object compared to that of another object.for example two cars driving in the same highway in the same direction.

I hope this helps

Answer:

Mass of the ball, M = 6.667 kg

Explanation:

Given data:

Momentum, Mo = 10.0 kgm/s

Velocity of the rolling ball, V = 1.5 m/s

Mass of the body, M = ?

Momentum, Mo = Mass, M x Velocity, V

10.0 kgm/s = M x 1.5 m/s

Divide each side by 1.5 m/s

M = 10.0 kgm/s / 1.5 m/s

M = (6⅔) kg

:. Mass of the ball, M = 6.667 kg

Answer:

The impression of the image on the retina lasts for about 1/16th of a second after the removal of the object. If a burning stick of incense is revolved at a rate of more than sixteen revolutions per second, we see a circle of red light due to persistence of vision.

Explanation:

Answer:

4

Explanation:

because when u have 5 then take 1 away u have 4

Answer:

1 Mole

Explanation:

The molecular weight of H2O is 18grams/mole. The conversion from grams to moles looks something like this:

18grams H2O (1moleH2O/18grams H2O) = 1 mole