PHYSICS MIDDLE SCHOOL

What did Rutherford’s model of the atom include that Thomson’s model did not have?

Answers

Answer 1

Answer:

Answer with Explanation:

Atom=Smallest Particle present on earth

Subatomic Particle=Smaller than Atom(Electron +Proton)

Electron = -vely Charged Particle

Proton =+vely Charged Particle

In J.J Thompson Model of Atom , which is called Plum Pudding model ,Electrons and Protons that is Subatomic particles were uniformly Distributed inside the Nucleus of Atom.

But Rutherford Contradicted Thompson by saying that, Protons are fixed inside the nucleus and Electrons are moving in Elliptical path around the nucleus like the planets around the sun.This Model is Known as Planetary Model.

Answer 2

Answer: Rutherford’s new evidence allowed him to propose a more detailed model with a central nucleus. he suggested that the Positive charge was all in a central nucleus.

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Brief definition of gravity

Answers

A force that pulls on mass to another

A force that pulls one mass .

The primary job of a(n) ____ is to increase the power of a modified radio wave.antenna
amplifier
modulater
transmitter

Answers

Answer:

Ampifier

Explanation:

Hope this helps

Answer:

amplifier

Explanation:

on edge 2020

How do you find cumulative effect of two or more forces acting on an object

Answers

The cumulative effect, or the resultant, of two or more forces is obtained by resolving the forces. This is done by addition if the forces act in the same direction through the same point and by subtraction if the forces act in opposite direcitons through the same point. However, if the forces are placed at an angle to one another, they must be resolved into their consituent x and y (and z if necessary) components and then their resultant is calculated.

Answer:

Cumulative effect of two or more force can be found using Vector sum of all forces

Explanation:

Force is a vector quantity and in order to find the resultant of two or more forces we have to use the concept of vector addition

here we know that vector addition rule is given as

$F_(net) = √(F_1^2 + F_2^2 + 2F_1F_2cos\theta)$

here we know that

$\theta$ = angle between two forces

so using this equation we can find the cumulative effect of two forces which are inclined at an angle with respect to each other

A 50-kg ice skater is holding a 3-kg ball, moving at a steady +5 m/s. She then throws the ball backwardsat -10 m/s, if so what would her final velocity be?

Answers

Answer: 5.9 m/s

Explanation:

This problem can be solved by the Conservation of Momentum principle, which establishes that the initial momentum $p_(o)$ must be equal to the final momentum $p_(f)$ :

$p_(o)=p_(f)$ (1)

Where:

$p_(o)=(m_(1)+m_(2))V_(o)$ (2)

$p_(f)=m_(1)U_(f)+m_(2)V_(f)$ (3)

$m_(1)=50 kg$ is the mass of the skater

$m_(2)=3 kg$ is the mass of the ball

$V_(o)=5 m/s$ is the initial velocity of the skater and the ball

$V_(f)=-10 m/s$ is the final velocity of the ball

$U_(f)$ is the final velocity of the skater

Substituting (2) and (3) in (1):

$(m_(1)+m_(2))V_(o)=m_(1)U_(f)+m_(2)V_(f)$ (4)

Isolating $U_(f)$ :

$U_(f)=((m_(1)+m_(2))V_(o)-m_(2)V_(f))/(m_(1))$ (5)

$U_(f)=\frac{(50 kg+3 kg)5 m/s}-(3 kg)(-10 m/s)}{50 kg}$ (6)

Finally:

$U_(f)=5.9 m/s$

Gold alloys are _____.much harder than pure gold
do not last as long as pure gold
much more valuable than pure gold
much softer than pure gold

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Much harder then pure gold.

A wet towel is hanging on a clothesline in the sun. What process does the towel dry by?

Answers

by convection radiation...the heat from the sun travels to the towel through air molecules(radiation),the heat is then transfer in the towel through water molecules(convection)..thereby gradually drying up the water molecules in the towel

The towel dries by the process of evaporation. The sun heats up the water and changes it to water vapour.

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