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3 years ago

What elements are the most reactive

2 answers:

4 0

Halogens are the most reactive elements. Halogens include: <span>fluorine, chlorine, bromine, iodine, and astatine</span>

torisob [31]3 years ago

3 0

Among all the elements on periodic table, Halogen (17th group) elements are most reactive 'cause of high electronegativity. & among all of them, "Fluorine" is most reactive.

In short, Your Answer would be "Halogens"

Hope this helps!

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A 3.0-kilogram toy dump truck moving with a speed of 4.0 m/s starts up a ramp. How high does the truck roll before it stops?

baherus [9]

Before it reaches the ramp, the toy's kinetic energy is

(1/2) (mass) (speed²)

= (1/2) (3 kg) (16 m²/s²)

= 24 Joules .

On the way up the ramp, its kinetic energy will change to
gravitational potential energy, and it'll stop when it's height
gives it 24 joules of potential energy.

Potential energy = (mass) (gravity) (height)

24 joules = (3 kg) (9.8 m/s²) (height)

Divide each side by 29.4 kg-m/s² (that's the same as 29.4 newtons):

Height = 24 joules / 29.4 newtons

= 0.816 meter higher than the bottom of the ramp.

7 0

3 years ago

The fastest propeller-driven aircraft is the Russian TU-95/142, which canreach a maximum speed of 925 km/h. For this speed, calc

valentinak56 [21]

Answer:

The resultant displacement of plane = 1310.76 Km

Explanation:

Given that,

Speed of the plane = 925 Km/h

Therefore, in 1 hour plane travels 925 Km

From figure,

Displacement if it travels east for 1.5 h, AB = 1387.5 Km

Displacement if it travels north-west for 2 h, BC = 1850 Km

Angle formed between two displacement = 135°

The resultant displacement is given by the relation

AC² = AB² + BC² + 2 AB BC Cos θ

Substituting the values in the equations,

AC² = 1387.5² + 1850² + 2 x 1387.5 x 1850 x Cos 135°

= 1718095

AC = 1310.76

Therefore, the resultant displacement of plane is 1310.76 Km

7 0

3 years ago

Calculate the magnitude of the focal length and power of a spherical mirror that has a radius of 5.00 cm.

yarga [219]

Answer:

2.5 cm

40 D

Explanation:

When the radius of curvature of a lens is divided by 2 we get the focal length of the lens.

Focal length is given by

$f=\dfrac{R}{2}\\\Rightarrow f=\dfrac{5}{2}\\\Rightarrow f=2.5\ cm$

The focal length of the lens is 2.5 cm

When we divide 1 by the focal length in the unit of meters we get the power of a lens

Power of a lens is given by

$P=\dfrac{1}{f}\\\Rightarrow P=\dfrac{1}{0.025}\\\Rightarrow P=40\ D$

The power of the lens is 40 D

5 0

4 years ago

The angle between incident ray and reflected ray is 130.what is the value of angle of incidence

Artyom0805 [142]

Answer:

Explanation:

as i = r , so i + i = 130

so , i = 130/2 =65

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