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3 years ago

Describe electronegativity, and explain the trend of electronegativity in the Periodic Table

Physics

1 answer:

vaieri [72.5K]3 years ago

8 0

Explanation:

Electronegativity is the property of an atom that attracts the shared pair of an electron to itself. There is a trend in the periodic table.

While moving down in a group, the electronegativity decreases. This is due to the reason that as we move down the number of shells added and so the electron become very far from the pull of the nucleus.

As we move across a period the electronegativity increases. This is because of the no. of charge on the nucleus increase.

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A mass of 2.82 kg is hung from a spring, causing the spring to stretch 0.331 m. If a second mass of 3.09 kg is now added to the

irina1246 [14]

Answer:

0.694 m

Explanation:

Case 1 : When only mass of 2.82 kg is hanged from spring

m = mass hanged from the spring = 2.82 kg

x = stretch caused in the spring = 0.331 m

k = spring constant

Using equilibrium of force in vertical direction

Spring force = weight of the mass

k x = m g

k (0.331) = (2.82) (9.8)

k = 83.5 N/m

Case 2 : When both masses are hanged from spring

m = mass hanged from the spring = 3.09 + 2.82 = 5.91 kg

x = stretch caused in the spring = ?

k = spring constant = 83.5 N/m

Using equilibrium of force in vertical direction

Spring force = weight of the mass

k x = m g

(83.5) x = (5.91) (9.8)

x = 0.694 m

4 0

3 years ago

A railroad tank car contains milk and rolls at a constant speed along a level track. The milk begins to leak out the bottom. The

kifflom [539]

Answer:

option C

Explanation:

The correct answer is option C

There is no external force acting in the system hence the momentum will be conserved.

As the milk is leaking out of the tank mass of the tanker is decreasing.

When the mass of the container will decrease to conservation the momentum speed of the container will have to be increased.

So, the car carrying milk will speed up.

8 0

3 years ago

A mass of 4.8 kg is dropped from a height of 4.84 meters above a vertical spring anchored at its lower end to the floor. If the

krek1111 [17]

Answer:

45.6 cm

Explanation:

Let x (m) be the length that the spring is compressed. We know that when we drop the mass from 4.84 m above and compress the springi, ts gravitational energy shall be converted to spring potential energy due to the law of energy conservation

$E_g = E_p$

$mgh = 0.5kx^2$

where h = 4.84 + x is the distance from the dropping point the the compressed point, and k = 24N/cm = 2400N/m is the spring constant, g = 9.81 m/s2 is the gravitational acceleration constant. And m = 4.8 kg is the object mass.

$4.8*9.81(4.84 + x) = 0.5 * 2400 * x^2$

$47.088x + 227.906 = 1200x^2$

$1200x^2 - 47.088x - 227.906 = 0$

$x = 0.456m$ or 45.6 cm

5 0

4 years ago

A taxi is travelling at 15m/s.it drive acceleration 3m/s for 4s. What is the new velocity?

Varvara68 [4.7K]

Answer:

27 m/s

will be the new velocity

Explanation:

if acceleration is 3 then it must be 3 m/s^2

3 0

3 years ago

If a box is pushed across a floor with a force of 130N. The frictional force acting between the box and the floor is 30N, over a

Sidana [21]

The force acting in the front direction is the 130N.
The frictional force is acting backwards 30N.

1) The net force is 130N - 30N = 100N

2) s = ut + (1/2)at^2    u = 0, Start from rest, s = 25m t =5.

25 = 0*5 + (1/2)* a * 5^2.

25 = 0 + 25/2 * a.

25 = (25/2)a. Divide 25 from both sides.

1 = (1/2)* a. Cross multiply.

2 = a.

a = 2 m/s^2.

3) Mass of the box
Net Force, F = ma
   100 = m*2. Divide both sides by 2.

   100/2 = m
   50    = m.
      m = 50 kg.

4) Final velocity ,   v = u + at.
   v = 0 + 2*5 = 10 m/s.

   Kinetic Energy, K = (1/2) * mv^2.
      = 1/2 * 50 * 10 * 10.
      = 2500 J.

3 0

3 years ago