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3 years ago

4. Elements that lie along the stair step line of the periodic table are

Physics

1 answer:

MakcuM [25]3 years ago

7 0

The answer is B. metalloids

(boron, silicon, germanium, arsenic, antimony, tellurium, astatine, and polonium)

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References

never [62]

a b c d

A V=V+gt

dhehehdhehdhshehehehehehe

4 0

3 years ago

Which metal is liquid at room temperature?

White raven [17]

D. mercury.............

7 0

3 years ago

Read 2 more answers

Desde el balcón de un edificio se deja caer una manzana y llega a la planta baja en 5 s. ¿Desde qué piso se dejó caer, si cada p

miv72 [106K]

Answer: 42

Explanation:

I will answer this in English.

We know that the apple needs 5 seconds to reach the ground.

Each floor of the building has a height of 2.88m.

Now, when we drop something, the only force acting on the object is the gravitational one, so the acceleration of the apple is:

a = -g

for the velocity, we integrate the acceleration over time, and as the apple is dropped, we do not have any initial velocity, so we do not have a constant in the integration:

v = -g*t

for the position we integrate again, now we have an initial height H, so the position is:

p = (-g/2)*t^2 + H

now the apple hits the ground when p = 0, so we can solve this equation to find H.

i will use g = 9.8m/s^2

0 = (-4.9m/s^2)*(5s)^2 + H

H = 122.5 m

now knowing H, we can divide it by the height of a floor in the building and get the number of the floor.

N = 122.5m/2.88m = 42.5

this means that the apple was dropped in the floor 42 (the 0.5 means that the apple was not right where the floor 42 starts, it was dropped around the middle of the floor 42)

5 0

3 years ago

How many milligrams in 1 gram. ??? HELP !!!

blagie [28]

1,000 milligrams = 1 gram
2,000 milligrams = 2 grams
3,000 milligrams = 3 grams
4,000 milligrams = 4 grams

3 0

4 years ago

Read 2 more answers

The law of repulsion by Coulomb agrees with: Newton's law of universal gravitation Newton's laws of motion the findings of Gilbe

s344n2d4d5 [400]

Explanation:

The law of repulsion is given by Coulomb. The mathematical form of Coulomb law is given by :

$F=\dfrac{kq_1q_2}{r^2}$ ...............(1)

Where

F is the force

k is the electrostatic constant

$q_1\ and\ q_2$ are electric charges

r is the distance between charges

The Newton's law of universal gravitation is given by :

$F=\dfrac{Gm_1m_2}{r^2}$ ..............(2)

G is the universal gravitational constant

From equation (1) and (2) it is clear that both law obeys inverse square law and both are of same type. So, the law of repulsion by Coulomb agrees with the Newton's law of universal gravitation.

7 0

4 years ago