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4 years ago

The atomic radius of main-group elements generally increases down a group because ________.

Physics

1 answer:

Elanso [62]4 years ago

7 0

Answer:

The principal quantum number of the valence orbitals increases.

Explanation:

The atomic radius of main-group elements generally increases down a group because the principal quantum number of the valence orbitals increases.

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13. A ball is dropped. According to Newton's Third Law, the action force is the

katrin2010 [14]

Answer:

the ground when the ball hits it

Explanation:

A ball falls freely towards the Earth. If the action force is the Earth pulling down on the ball, then identify which of the following best describe the reaction force:

8 0

3 years ago

A 1423-kg car is moving along a level highway with a speed of 26.4 m/s. The driver takes the foot off the accelerator and the ca

Leona [35]

Answer:

Final speed, v = 28.81 m/s

Explanation:

Given that,

Mass of the car, m = 1423 kg

Initial speed of the car, u = 26.4 m/s

Force experience by the car, F = 901 N

Distance, d = 106 m

To find,

The speed of the car after traveling this distance.

Solution,

The force experienced by a car is equal to the product of mass and acceleration.

$F=ma$

$a=\dfrac{F}{m}$

$a=\dfrac{901}{1423}$

$a=0.63\ m/s^2$

Let v is the final speed of the car. Using third equation of motion to find it as :

$v^2-u^2=2ad$

$v^2=2ad+u^2$

$v^2=2\times 0.63\times 106+(26.4)^2$

v = 28.81 m/s

So, the final speed of the car is 28.81 m/s.

5 0

4 years ago

Why is thermal expansion an important consideration for engineering?

Dennis_Churaev [7]

Answer:

Explanation:

Thermal expansion is where materials expand while being heated, causing them to take up more space. Some materials expand more than others. But this all happens due to the motion of tiny little molecules. Temperature is the average kinetic energy of the molecules in a substance.

Thermal expansion is an important consideration for engineering because different materials exhibit changes in size when exposed to heat. Thus, affecting length, width, surface area, volume, shape etc

8 0

4 years ago

Read 2 more answers

A man finds that he has a mass of 100.6 kg. He goes on a diet, and several months later he finds that he has a mass of 96.4 kg.

aleksley [76]

Answer:

1006×10^-1kg

Explanation:

Because 1006kgx10^-1 will give you 100.6kg

8 0

3 years ago

Read 2 more answers