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2 years ago

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Which scientist described an atom made of a solid positively charged substance with electrons dispersed throughout it?.

1 answer:

swat322 years ago

3 0

The scientist that described an atom made a solid positively charged substance with electrons dispersed throughout it was: Ernest Rutherford

In 1911 Ernest Rutherford proposed his atomic model in which he considered the atom as a positively, densely charged center called a nucleus in which the electrons circulate around the core with a negative charge.

<h3>What is an atom?</h3>

The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.

Learn more about the atom at: brainly.com/question/17545314

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Which statement describes all chemical changes but not all physical changes.

ki77a [65]

Answer:

burning, cooking, rusting, and rotting.

Explanation:

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3 years ago

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a circuit shown below is Wheastone Bridge used to determine the valve of unknown resistor X by comparison with three resistors M

stiv31 [10]

Answer:

X = 0.6

Explanation:

The resistance of the unknown resistor can be found by using the formula of the Wheatstone bridge:

$\frac{M}{N}=\frac{P}{X}\\\\\frac{850}{15} = \frac{33.48}{X}\\\\X = \frac{(33.48)(15)}{850}$

<u>X = 0.6</u>

Hence, the unknown value of resistance is found to be 0.6 units.

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3 years ago

A body weighing 108N moves with seed of 5ms–¹ in a horizontal circular path of radius 5m. Calculate the magnitude of the centrip

uysha [10]

Hi there!

Recall the equation for centripetal force;

$\boxed{F_c = \frac{mv^2}{r}}$

m = mass (kg)

v = velocity (m/s)

r = radius (m)

We are not given the mass directly, we are given the object's weight.

$W = mg$

$108 = 10m \\\\m = 10.8 kg$

Now, we can plug this value along with the given velocity and radius to solve:

$F_c = \frac{10.8(5^2)}{5} = \boxed{54N}$

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2 years ago

What happens if you go through a black hole ?

devlian [24]

Explanation:

The intense gravity of the black hole would pull you apart, separating your bones and muscles.

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3 years ago

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if you throw a rock straight up at a speed of 19m/s. How long goes it take the ball to reach its maximum height?

Scrat [10]

Answer:

It requires <u>1.9 seconds</u> to reach maximum height.

Explanation:

As per given question,

Initial velocity (U) =19 m/s

Final velocity (V) = 0 m/s

$\text { Taking acceleration due to gravity }(a)=10 \mathrm{m} / \mathrm{s}^{2}$

Maximum height = S

Time taken is "t"

<u>Calculating time taken to reach maximum height:</u>

We know that time taken to reach the maximum height is calculated by using the formula V = U + at

Substitute the given values in the above equation.

Final velocity is “0” as there is no velocity at the maximum height.

$0=19+10 \times t$

$-19=10 \times t$

$\frac{-19}{10}=t$

t = 1.9 seconds.

The time taken to reach maximum height is <u>1.9</u> seconds.

<u>Calculating maximum height</u>:

$\text { Consider the equation } V^{2}-U^{2}=2 a S$

Solving the equation we will get the value of S

$0-19^{2}=2 \times(-10) \times \mathrm{S} .(-\text { is due to opposite of gravity) }$

-361 = -20S

Negative sign cancel both the sides.

$\mathrm{S}=\frac{361}{20}$

S = 18.05 m

Maximum height is 18.05 m .

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3 years ago