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STALIN [3.7K]
3 years ago
8

In a periodic table, dots around an elements symbol indicate the number of valence electrons in an atom ? True Or False

Physics
2 answers:
gavmur [86]3 years ago
5 0
I would probally say  true? I am not positive

Blababa [14]3 years ago
3 0
That is absolutely true!

The dots are electrons that are in the orbitals.
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When you drop an object from a certain height, it takes time T to reach the ground with no air resistance. If you dropped it fro
alexandr402 [8]

Answer:

Explanation:

Given

When we drop an object from height , suppose h

it takes time T

using equation of motion

h=ut+\frac{1}{2}at^2

where  

h=displacement

u=initial\ velocity

a=acceleration

t=time

here u=0 because it dropped from a certain height

h=\frac{1}{2}gT^2

T=\sqrt{\frac{2h}{g}}

When height is increases to three times of original height

i.e. h'=3 h

then time period becomes

T'=\sqrt{\frac{2\times 3h}{g}}

T'=\sqrt{3}T

5 0
3 years ago
What type of motion does this graph represent?
Fantom [35]
An object moving with constant velocity
5 0
3 years ago
An automobile traveling 95 km/h overtakes a 1.30-km-long train traveling in the same direction on a track
BartSMP [9]

1) 234 s, 6.18 km

The position of the car at time t is described as

x_c(t) = v_c t

where

v_c = 95 km/h is the velocity of the car

The position of the head of the train instead is given by

x_t(t) = d + v_t t

where

d = 1.30 km is the initial distance between the car and the head of the train

v_t = 75 km/h is the velocity of the train

The car overtakes the train when

x_c =x_t

Substituting and solving for t,

v_c t = d + v_t t\\t(v_c-v_t)=d\\t=\frac{d}{v_c-v_t}=\frac{1.30}{95-75}=0.065 h = 234 s

And the distance travelled by the car is

x_c = v_c t = (95 km/h)(0.065 h)=6.18 km

2) 27.5 s, 0.72 km

In this case, the train is travelling in opposite direction, so we can write

v_t = -75 km/h

Again, we can use the same equation as before

x_c =x_t

And solving for t, we find

v_c t = d + v_t t\\t(v_c-v_t)=d\\t=\frac{d}{v_c-v_t}=\frac{1.30}{95+75}=0.0076 h = 27.5 s

And the distance travelled by the car is

x_c = v_c t = (95 km/h)(0.0076 h)=0.72 km

5 0
3 years ago
Can someone help me with #7
bekas [8.4K]
The ratio of (new volume / old volume) is the same as the ratio of (new temperature / old temp).

Just remember that you have to use the ABSOLUTE temperatures.

An absolute temperature is (Celsius + 273).
7 0
4 years ago
Plz help me I’m a desperate little boy
Neporo4naja [7]

It is the first one. But if you have this question you are not a little boy

5 0
3 years ago
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