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Dmitriy789 [7]
4 years ago
15

Please help ! Will mark brainliest

Physics
2 answers:
podryga [215]4 years ago
3 0
Electrons are negatively charged particles whereas protons are positively charged particles.

When a negative is shown on the bar, this means that the difference between the electrons and protons is a negative value, which also means that the number of electrons (negative particles) is more than the number of protons (positive particles).

Based on the above, the correct choice would be:
<span>D. There are more electrons than protons 
</span>
Nutka1998 [239]4 years ago
3 0

The answer is D. We know protons are positively charged particles while are negatively charged particles. When a negative is exposed on the bar, this means that the change between the electrons and protons is a negative value, meaning that the number of electrons is greater than the number of protons.

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Two identical soccer balls are rolled toward each other. What will be true after they collide head-on? (2 points)
Vlada [557]

well it depends on how much force was added but if they both have the same amount of force and they were rolled at the same time either they will bounce backwards or roll backwards not thats your question will they roll backwards are bounce backwards?

8 0
4 years ago
A scene in a movie has a stuntman falling through a floor onto a bed in the room below. The plan is to have the actor fall on hi
tekilochka [14]

Answer:

The maximum mass that can fall on the mattress without exceeding the maximum compression distance is 16.6 kg

Explanation:

Hi there!

Due to conservation of energy, the potential energy (PE) of the mass at a height of 3.32 m will be transformed into elastic potential energy (EPE) when it falls on the mattress:

PE = EPE

m · g · h = 1/2 k · x²

Where:

m = mass.

g = acceleration due to gravity.

h = height.

k = spring constant.

x = compression distance

The maximum compression distance is 0.1289 m, then, the maximum elastic potential energy will be the following:

EPE =1/2 k · x²

EPE = 1/2 · 65144 N/m · (0.1289 m)² = 541.2 J

Then, using the equation of gravitational potential energy:

PE = m · g · h =  541.2 J

m =  541.2 J/ g · h

m = 541.2 kg · m²/s² / (9.8 m/s² · 3.32 m)

m = 16.6 kg

The maximum mass that can fall on the mattress without exceeding the maximum compression distance is 16.6 kg.

6 0
3 years ago
Chris threw a basketball a distance of 27.5 m to score and win his
salantis [7]

Answer:

v₀ = 16.55 m/s

Explanation:

This motion of the ball can be modeled as a projectile motion with following data:

R = Range of Projectile = 27.5 m

θ = Launch Angle = 50°

g = acceleration due to gravity = 9.81 m/s²

v₀ = Initial Speed of Ball = ?

Therefore, using formula for range of projectile, we have:

R = \frac{v_{0}^2\ Sin2\theta}{g}\\\\v_{0}^2 = \frac{Rg}{Sin2\theta}\\\\v_{0}^2 = \frac{(27.5\ m)(9.81\ m/s^2)}{Sin100^o}\\\\v_{0} = \sqrt{273.93\ m^2/s^2}

<u>v₀ = 16.55 m/s</u>

8 0
3 years ago
An elevator accelerates upward at 1.2 m/s 2 . the acceleration of gravity is 9.8 m/s 2 . what is the upward force exerted by the
Marysya12 [62]
We can find the force by using the following formula;
N = ma +  mg
Fa = ma = 76 x 1.2 = 91.2
Fg = mg = 76 x 9.8 = 744.8
N = 91.2 + 744.8 = 836
So, the force is 836 N.
8 0
3 years ago
Air will break down (lose its insulating quality) and sparking will result if the field strength is increased to about 3 × 106 N
MrRissso [65]

Answer:

Acceleration,a=5.27\times 10^{17}\ m/s^2

Explanation:

Given that,

Electric field strength, E=3\times 10^6\ N/C

Mass of the electron, m=9.109\times 10^{-31}\ kg

Charge on electron, q=1.602\times 10^{-19}\ C

Let a is the acceleration experienced by an electron. It can be calculated as :

ma=qE

a=\dfrac{qE}{m}

a=\dfrac{1.602\times 10^{-19}\times 3\times 10^6}{9.109\times 10^{-31}}

a=5.27\times 10^{17}\ m/s^2

Hence, this is the required solution.

4 0
3 years ago
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