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4 years ago

5

_____ prescribed atoms as having a positive nucleus with electrons that have different energies at different distances from the

nucleus

1 answer:

galina1969 [7]4 years ago

3 0

Answer

Niels Bohr

Explanation

in 1915, Niel Bohr proposed a model of the atom which is known as Bohr Model of atoms. Bohr modified the Rutherford Model of atom and some people called this model as Rutherford-Bohr Model. Bohr model was based on quantum mechanics.

The Bohr Model was similar to planetary model. According to Bohr, electrons which are negatively charged are present in an orbit around the positively charged nucleus in a similar manner like planets revolves around the Sun in an orbit. .

main postulates of Bohr's model are as follows

Electrons are present around the nucleus in orbits which have a set size and energy.
Energy of the orbit in which electrons are present depends on the size of the orbit. smallest orbit has the lowest energy.
When transition of an electron takes place (when electron moves from one orbit to another orbit) that time energy (radiation) is emitted or absorbed.

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A 7.0 kg box is at rest on a table. The static friction coefficient jis between the box and table is 0.40, and

Neko [114]

Answer:

A m 23 3.3 32 m 0.37

Explanation:

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3 years ago

How does charging by conduction occur?

lutik1710 [3]

Answer : (A) A charged object is brought near a neutral object without touching it.

Explanation:

Bodies can be charged by the method of conduction. By conduction the body acquires the same charge as on the charging body.

Charging the body can be understood by the following example of charging a paper cylinder by conduction. Make a paper cylinder by rolling a strip of paper on a pencil and then gently pulling out the pencil. Suspend the paper cylinder by a string tied to its center, now touch the paper cylinder with a glass rod rubbed with silk so it has a positive charge. Remove the class rod and the again bring it near to the paper cylinder.

The paper cylinder is repelled by the positively charged rod. And when you bring a negatively rubbed rod, next to the cylinder it will be attracted towards the rod. This means that the paper cylinder has acquired a positive charge as on the glass rod due to conduction.

8 0

3 years ago

A uniform sphere (I = 2/5 MR 2 ) rolls down an incline. (a) What must be the incline angle if the linear acceleration of the cen

Liono4ka [1.6K]

Answer:

Part a)

$\theta = 8.05 degree$

Part b)

$a = 1.37 m/s^2$

Explanation:

As the uniform sphere is rolling down the inclined plane then the net force on the sphere is given as

$mg sin\theta - F_f = ma$

also we have torque equation on it

$F_f R = I\alpha$

for pure rolling

$a = R \alpha$

$F_f = \frac{Ia}{R^2}$

now we have

$mg sin\theta = ma + \frac{Ia}{R^2}$

now we have

$mg sin\theta = (m + \frac{2}{5}m)a$

$a = \frac{5}{7}g sin\theta$

now given that

$a = 0.10 g$

so we have

$0.10 g = \frac{5}{7} g sin\theta$

$sin\theta = 0.14$

$\theta = 8.05 degree$

Part b)

If the inclined plane is frictionless then the acceleration is given as

$a = g sin\theta$

$a = 9.8(0.14)$

$a = 1.37 m/s^2$

5 0

3 years ago

Read 2 more answers

A wheel rotates with a constant angular acceleration of  rad/s2. During a certain time interval its angular displacement is  r

Hatshy [7]

Answer:

The angular velocity at the beginning of the interval is $\pi\sqrt{2}\ rad/s$ .

Explanation:

Given that,

Angular acceleration $\alpha=\pi\ rad/s^2$

Angular displacement $\theta=\pi\ rad$

Angular velocity $\omega =2\pi\ rad/s$

We need to calculate the angular velocity at the beginning

Using formula of angular velocity

$\alpha =\dfrac{\omega^2-\omega_{0}^2}{2\theta}$

$\omega_{0}^2=\omega^2-2\alpha\theta$

Where, $\alpha$ = angular acceleration

$\omega$ = angular velocity

Put the value into the formula

$\omega_{0}^2=(2\pi)^2-2\times\pi\times\pi$

$\omega=\sqrt{2\pi^2}$

$\omega_{0}=\pi\sqrt{2}\ rad/s$

Hence, The angular velocity at the beginning of the interval is $\pi\sqrt{2}\ rad/s$ .

3 0

3 years ago

Meg goes swimming on a hot afternoon. When she comes out of the pool, her foot senses that the prevement is unbearably hot. Supp

mart [117]

1.Record her observation with the time it was hot.
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3. Come up with a hypothesis about why it is hot.
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5. Come up with a conclusion. If her hypothesis is not supported, design a new experiment or gather more info.

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3 years ago