Can you please check if the answer I checked the right ​

Answer:

Radioactivity means: the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.

Explanation: I hope this helps! :)

Answer:

sending out harmful radiation caused when the nuclei (=central parts) of atoms are broken up.

Answer:

225 N to the right

Explanation:

got it wrong on the quiz and revealed the correct answer

Answer:

I think it is velocity.

because velocity shows the direction and magnitude .

Answer:

Velocity

Explanation:

This is a case of velocity, since velocity apart from having magnitude also has direction. the person walks at 8 [m/s] to the North.

When we talk about speed, we only talk about the magnitude without taking into account the direction.

Answer:

B

Explanation:

i got it right on the usatestprep

Answer:

0 m/s

Explanation:

In this problem,

A ball thrown vertically upward reaches a maximum height of 30 meters above the surface of Earth. We need to find the speed of the ball at the maximum height. When an object reaches its maximum height, after then it starts to decrease its speed. As a result, the speed of the ball will be equal to 0 m/s.

The speed of the ball thrown upwards is zero when the object reaches maximum height.

The given parameter:

The velocity of an object thrown upwards decreases with time because the object is moving against gravity, and the eventually becomes zero when the object reaches maximum height.

[tex]v_f = v_0 - gt= 0[/tex]

Thus, the speed of the ball thrown upwards is zero when the object reaches maximum height.

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Answer:

To summarize, an object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of the object is...

Given that,

distance = d = 1200m

velocity/speed = s = 50m/s

time = t

Also,

s = d/t

And,

t = d/s

t = 1200/50

t = 120/5

t = 24

Therefore, it takes 24s to travel.

Answer: Therefore, the travel time of a car that travels 1200 meters at 50 m/s is 24 seconds.

Explanation:

An object travels in a straight line for 1200 m at a velocity of 50 m/s, what is its time of travel?​

Data:

d = 1200 m

V = 50 m/s

t = ?

The formula for uniform motion is:

Where

We clear the formula for time t:

t = d/v

t = (1200 m)/(50 m/s)

t = 24 s

Therefore, the travel time of a car that travels 1200 meters at 50 m/s is 24 seconds.

Answer:

Aluminium is just on the metal side of the border between metals and metalloids, so it is not considered to be a metalloid

Explanation:

it is a metal

Answer:

Aluminum-(Al) is a metal

Answer:

m = 20,000 kg

Explanation:

Force, [tex]F=2.5\times 10^4\ N[/tex]

Acceleration of the shark, [tex]a=1.25\ m/s^2[/tex]

It is required to find the mass of the shark. Let m is the mass. Using second law of motion to find it as follows :

F = ma

Putting the value of F and a to find m

[tex]m=\dfrac{F}{a}\\\\m=\dfrac{2.5\times 10^4}{1.25}\\\\m=20,000\ kg[/tex]

So, the shark's mass is 20,000 kg.

Gamma rays are given out by the nucleus of certain radioactive materials. Radioactive material ray causes harm to the human beings and environment.

Gamma decay is the production of extremely high-frequency electromagnetic radiation in order to stabilize the unstable nucleus. You must be well-versed in the various energy levels found in an atom.

The Nucleus has its own amount of energy. Gamma decay is the nucleus' method of transitioning from a higher energy level to a lower energy level by emitting high energy photons.

Gamma rays are given out by the nucleus of certain radioactive materials.

Hence, nucleus is the right answer for the blank.

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Answer:

i think its student b (d)

Explanation:

it might be student b cuz every action creates an equal and opposite reaction

Student B states that when she sits on the chair, the chair is actually exerting a force back on her in reaction to her force exerted upon the chair because of newton's third law. Hence, option D is correct.

The third law of Newton asserts that when bodies interact, they exert forces that are equal in size and directed in the opposite direction. Another name for the third law is the law of reaction and action. This law is crucial for understanding issues with static balance, where all pressures are in balance, but it also remains true for bodies moving at a constant or accelerated speed.

It doesn't only use bookkeeping methods; the forces it represents are actual forces. For illustration, a book laying on a table exerts downward pressure equal to the weight of the book on the table. The table produces an equal and opposite force on the book in agreement with the third law.

Therefore, student B is correct that because of Newton's third law there is an equal and opposite action and counteracts the student's so that neither move.

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Answer:

2.5 m/s²

Explanation:

Given:

v₀ = 15 m/s

v = 45 m/s

t = 12 s

Find: a

a = (v − v₀) / t

a = (45 m/s − 15 m/s) / 12 s

a = 2.5 m/s²

Answer:

3: I can´t see the text/image, but it depend on the mass and the force applied to the ball, if both are too high, it will be harder to make a home run. (Second law)

4:It would be easier to make a home run because there is no interruption between the ball and the space the same travels. (Third law)

Explanation:

Answer:

100 Nm and 25Nm/s.

Explanation:

Given the following data;

Force = 25N

Distance = 4m

Time = 5secs

To find the workdone;

Workdone = force * distance

Substituting into the equation, we have;

Workdone = 25*4

Workdone = 100 Nm

To find the power consumed;

Power = workdone/time

Substituting into the equation, we have;

Power = 100/4

Power = 25Nm/s

The work done on the box is 100 Nm, and the power is 25 Nm/s.

Answer:

Net Force = 0

Explanation:

Causes objects to accelerate. Balanced Forces. Two equal forces push in opposite direction causing no change in motion causing net force = 0.

Answer:

Newton's second law of motion states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. If the only force acting on an object is due to gravity, the object is in free fall.

Explanation:

Hope this helps :)

Answer:

no

Explanation:

the metal spoon would be higher temperature

Answer:

Yes

Explanation:

Answer:

3.6 N

Explanation:

The magnitude of centripetal force in this case is equal to the magnitude of tension in the spring.

The formula is :

T= mv²/r ------where T is tension

m= mass of object =0.8 kg

v= velocity of object {tangential velocity} = 3.0 m/s

r= length of string = 2m

Applying the formula with real values;

T= mv²/r

T= {0.8 * 3²} / 2

T= { 7.2}/2 = 3.6 N

Answer:

It is a constant when the light is traveling in a vacuum.

Answer:3.91

Explanation:

Answer: 1.6 hours

Explanation: 40/1.6 = 25

Answer:

hope this helps

Explanation:

solid particles are arranged according to the size of the object

while liquid particles are arranged how they move freely together in the object they are in.

while gas particles are arranged scatterly like they spread.