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3 years ago

Which scientist first made a model of the atom called the plum pudding model?

1 answer:

7 0

<span>The plum pudding model of the atom by the scientist Sir Joseph John Thompson or J.J. Thompson. It was theorized after the discovery that electrons are present in the atom. In this model, the atom is composed mainly of electrons. It was describe as plum pudding because the electrons are dispersed within the atom. John Dalton discovered the atom. Ernest Rutherford discovered the half – life of an atom and Neils Bohr explain the quantum mechanics. So the answer is J.J. Thompson.</span>

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Which electromagnetic wave has wavelengths ranging from the size of a printed period to the length of a pen (1×10-3 to 1×10-1 me

erastovalidia [21]

Answer: microwaves

Explanation:

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3 years ago

Read 2 more answers

While filming an intense action sequence for the next James Bond movie, a controlled explosion detonates 1.3 km away from the ac

brilliants [131]

To solve this problem we must basically resort to the kinematic equations of movement. For which speed is defined as the distance traveled in a given time. Mathematically this can be expressed as

$v = \frac{d}{t}$

Where

d = Distance

t = time

For which clearing the time we will have the expression

$t = \frac{d}{v}$

Since we have two 'fluids' in which the sound travels at different speeds we will have that for the rock the time elapsed to feel the explosion will be:

$t = \frac{1300m}{3000m/s}$

$t = 0.433s$

In the case of the atmosphere -composite of air- the average speed of sound is 343m / s, therefore it will take

$t = \frac{1300m}{343m/s}$

$t = 3.79s$

The total difference between the two times would be

$\Delta t = 3.79s-0.433s$

$\Delta t = 3.357s$

Therefore 3.357s will pass between when they feel the explosion and when they hear it

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4 years ago

The diagram shows two sets of vectors that result in a single vector. Four vectors added using the tip to tail method. The first

sesenic [268]

Answer:

find the sum of the two horizontal vectors and the sum of the two vertical vectors

Explanation:

made the most sense. you can beat me up if its wrong :D

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3 years ago

1. A moving object with a mass of 8.8 kg has linear momentum of magnitude 13 kg mis. What is the kinetic energy of

Juliette [100K]

Answer: Option C) 9.63 joules

Explanation:

Mass of object = 8.8kg

Speed of object = ?

Kinetic energy = ?

Momentum of the object = 13 kgm/s

Recall that momentum is a product of mass M and speed V of a moving object.

Thus, Momentum = Mass x Speed

13 kgm/s = 8.8kg x V

V = (13kgm/s ➗ 8.8kg)

V = 1.48 m/s

Now, that the speed of the object is known, calculate its kinetic energy. And, its kinetic energy depends on its mass M and speed, V

Thus, Kinetic energy = 1/2 x mv^2

= 1/2 x 8.8kg x (1.48m/s)^2

= 0.5 x 8.8kg x (1.48m/s)^2

= 4.4 x (1.48m/s)^2

= 9.63 joules

Thus, the kinetic energy of the object is

9.63 joules

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4 years ago

Which of the following is derived unit?

Taya2010 [7]

Answer:

D: m² (square meters, area)

Explanation:

Derived units are a combination of SI base units. m² is the only option that's a combination of base units (meters times meters).

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4 years ago