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3 years ago

19. What gives an atomic nucleus its

Physics

1 answer:

lana [24]3 years ago

3 0

Answer: The correct choice is, B: protons

Explanation:

Protons have a positive charge whereas neutrons have no charge and electrons have a negative charge. Due to positive charge of protons, nucleus of an atom acquires a positive charge. Therefore, we can conclude that protons are the particles give the nucleus its positive charge.

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An object with a potential energy of 200 joules is dropped from a height of 2.00 meters. What is its kinetic energy when it reac

taurus [48]

200J

Hope this helps :D

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4 years ago

Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second a

snow_lady [41]

Answer:

Explanation:

the first 35 to 40 acceleration will be 5 same as 40 to 45 ,

5+5=10

7 0

3 years ago

Track and field is an individual sport.<br> True or False?

mars1129 [50]

Most events in track and field are individual except relay races. Therefore, it would probably be true.

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3 years ago

Read 2 more answers

You throw a ball straight up. The ball has an initial speed of 11.2 m/s when it leaves your hand What is the maximum height the

Jet001 [13]

Answer:

Explanation:

Given

initial velocity $u=11.2\ m/s$

At maximum height velocity of ball is zero

using

$v^2-u^2=2as$

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

$(0)^2 -(11.2)^2=2\times (-9.8)\times (s)$

$s=\frac{11.2^2}{2\times 9.8}$

$s=6.4$

time taken by the ball to reach the maximum height

$v=u+at$

$0=11.2-9.8\times t$

$t=\frac{11.2}{9.8}$

$t=1.142\ s$

At $t=2\ s$ height of ball is

$h=ut+\\frac{1}{2}at^2$

$h=11.2\times 2-\frac{1}{2}9.8\times (2)^2$

$h=22.4-19.6$

$h=2.8\ m$

i.e. ball is moving downward

height at $v=5\ m/s$

$v^2-u^2=2as$

$s=\frac{25-125.4}{2\times (-9.8)}$

$s=5.12\ m$

8 0

3 years ago

Help with 2 Physics questions, WILL CHOOSE BRAINLIEST

Tju [1.3M]

1) D

2) D.) Greater than $\theta_c$

Explanation:

The phenomenon of total internal reflection occurs when a ray of light hitting the interface between two mediums is totally reflected back into the original medium, therefore no refraction into the second medium occurs.

This phenomenon occurs only if two conditions are satisfied:

The index of refraction of the first medium is larger than the index of refraction of the 2nd medium
The angle of incidence is greater than a certain angle called critical angle

In picture 1, we have 4 different diagrams. In the diagrams:

The red arrow represents the incident ray
The green arrow represents the refracted ray
The blue arrow represents the reflected ray

Total internal reflection occurs when there is no refraction, therefore when there is no green arrow: this occurs only in figure D, so this is the correct option. (in figure C, there is a refracted ray but it is parallel to the interface: this condition occurs when the angle of incidence is exactly equal to the critical angle, however in this problem, the angle of incidence is greater than the critical angle, so the correct option is D)

As we stated in problem 1), total internal reflection occurs when the angle of incidence is equal or greater than the critical angle. Therefore in this case, the angle of incidence must be

D.) Greater than $\theta_c$

3 0

3 years ago