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3 years ago

6

The outer electrons in an element are referred to as _____. valence electrons ground state electrons excited electrons none of t

he above

2 answers:

scZoUnD [109]3 years ago

4 0

This should be valence electrons. They determine the chemical properties of an atom.

Lorico [155]3 years ago

3 0

This should be valence electrons.

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An elevator starts from rest with a constant. upward acceleration andmoves 1m in the first. 1.8 s. A passenger in the elevator i

mina [271]

Newton's second law tells you:

Sum of forces on an object = ma

Here, the forces acting on the bundle are the tension in the string and the force of gravity, these two must combine to yield the acceleration of the bundle.

So we have:

T-mg = ma

or T=m(g+a)

We know m=8.7kg, we need to find a from the information

starting from rest, an accelerating object covers distance according to:

<span>dist = 1/2 at^2 </span>

to cover 1m in 1.8s, we have:

a=2d/t^2 = 2x1/1.8^2 = 0.62 m/s/s

Thus, the tension in the string is:

<span>T = m(g+a)
= 8.7</span>kg(9.8m/s/s+0.62m/s/s)
<span>
<span>T = 90.654 N
</span>
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

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5 0

3 years ago

The principle of conservation of momentum is most similar to which of newton's laws of motion?

Effectus [21]

Newton’s Thrid Law, which states that for every reaction there is an opposite reaction.

6 0

3 years ago

What activity is mainly a strength training excerise?

Sever21 [200]

Biceps curls & pushups , benchpress

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3 years ago

An elevator has a mass of 1000 Kg. What force is needed to accelerate it upward at a rate of 2 m/s/s?

zubka84 [21]

The force needed to accelerate an elevator upward at a rate of $2 m / s^{2}$ is 2000 N or 2 kN.

<u>Explanation: </u>

As per Newton's second law of motion, an object's acceleration is directly proportional to the external unbalanced force acting on it and inversely proportional to the mass of the object.

As the object given here is an elevator with mass 1000 kg and the acceleration is given as $2 m / s^{2}$ , the force needed to accelerate it can be obtained by taking the product of mass and acceleration.

$\text {Force}=\text {Mass} \times \text {Acceleration}$

$\text { Force }=1000 \times 2=2000 \mathrm{N}=2 \text { kilo Newon }$

So 2000 N or 2 kN amount of force is needed to accelerate the elevator upward at a rate of $2 m / s^{2}$ .

3 0

3 years ago

As air is heated, the particles speed up and spread out (becoming less dense). Hot air balloon pilots can change the balloon’s a

Jobisdone [24]

Answer:

Turn the heater on

Explanation:

There are two main forces involved in a balloon flight

The downward force is the total weight of the balloon: the air it contains, the gas bag, the basket, the passengers, etc.

The upward force is the weight of the of the air the balloon displaces.

During level flight ,

buoyant force = weight of displaced air - total weight of balloon

If you increase the temperature of the air in the bag, the air molecules spread out and leave through the bottom of the bag.

The balloon still has the same volume, so the weight of displaced outside air stays the same.

However, the balloon has lost some hot inside air, so its total weight decreases.

The upward force is greater than the downward force, so the balloon rises.

3 0

3 years ago