A book is at rest on a table. According to Newton's first law of motion, which explanation best describes the reason why the book is not moving? A) Gravity is pulling the book against the table. B) No net force is acting C) No forces are acting on the book.

1) A. 2

The electrostatic force between two objects is given by:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1 and q2 are the charges of the two objects

r is the separation between the two objects

In this problem, the charge of one object is doubled, so

[tex]q_1' = 2q_1[/tex]

Therefore the new force is

[tex]F'=k\frac{q_1' q_2}{r^2}=k\frac{(2q_1)q_2}{r^2}=2(\frac{kq_1 q_2}{r^2})=2F[/tex]

So, the force will double.

2) D. 1/4

Using the same formula, the electrostatic force between the two objects is:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

In this problem, the distance between the two objects is doubled, so

[tex]r' = 2r[/tex]

Therefore the new force is

[tex]F'=k\frac{q_1 q_2}{(r')^2}=k\frac{q_1 q_2}{(2r)^2}=\frac{1}{4}(\frac{kq_1 q_2}{r^2})=\frac{F}{4}[/tex]

So, the force will decrease to 1/4 of its original value.

3) 4/9

Using the same formula, the electrostatic force between the two objects is:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

In this problem, the amount of charge on both objects doubles, so

[tex]q_1' = 2q_1[/tex]

[tex]q_2' = 2q_2[/tex]

Also, the distance is tripled

[tex]r' = 3r[/tex]

Therefore the new force is

[tex]F'=k\frac{q_1' q_2'}{(r')^2}=k\frac{(2q_1) (2q_2)}{(3r)^2}=\frac{4}{9}(\frac{kq_1 q_2}{r^2})=\frac{4}{9}F[/tex]

So, the force will decrease to 4/9 of its original value.

Answer:

B) protons and neutrons.

Explanation:

The protons and neutrons are located in the nucleus of the atom and represent most of the 'mass' of the atom, that's their count that determine the 'mass' of an atom (like 12 for Carbon).

The electrons rotate around the nucleus and have a negligible mass.

Answer:

B

Explanation:

Protons have a positive charge, while neutrons have a no charge (neutral). There two components make up the nucleus. While electrons go around the nucleus creating an electron cloud.

Answer:

Infrared

Explanation:

Wien's displacement law states that the peak wavelength of the radiation emitted by an object is given by

[tex]\lambda=\frac{b}{T}[/tex]

where

[tex]b=2.898\cdot 10^{-3} m\cdot K[/tex] is the Wien's displacement constant

T is the absolute temperature of the object

In this problem,

T = 1000 K

So the peak wavelength of the radiation emitted by the body is

[tex]\lambda=\frac{2.898\cdot 10^{-3} m\cdot K}{1000 K}=2.90\cdot 10^{-6} m = 2.90 \mu m[/tex]

And this corresponds to infrared radiation, whose range of wavelength is 700 nm - 1 mm.

Answer:

The correct answer is visible light.

Explanation:

Answer:

27 J/(mol • K)

Explanation:

γ = Cp / Cv

We're given γ and we need to find Cp (heat capacity at constant pressure) per mole.  First we need to find Cv (heat capacity at constant volume).  Cv is defined as:

Cv = Cp − nR

where n is the number of moles and R is the ideal gas constant.

So:

γ = Cp / (Cp − nR)

γ (Cp − nR) = Cp

γ Cp − γnR = Cp

(γ − 1) Cp = γnR

Cp / n = γR / (γ − 1)

Given γ = 1.44 and R = 8.314 J/mol/K:

Cp / n = (1.44) (8.314 J/mol/K) / (1.44 − 1)

Cp / n = 27 J/mol/K

Answer:

Read below!

Explanation:

You can watch the sun wheel across the sky during the day, and the stars at night. Focus a telescope on any star besides the north star--especially southern stars--and you can watch them drift across your field of view.  

An alternative explanation is that all the stars are painted on (or holes in) some canopy that rotates around the earth. This explanation does not account for the motion of the "wanderers," or planets, as the Greeks called them, or for the path of the moon among the stars.  

As we know the stars are massive bodies of significant and varying distance to the earth, the notion they all swing around us in unison seems highly implausible

Electromagnetic waves carry energy in the form of photons. Nuclear energy is released during changes in the structure of a nucleus. Thermal energy is the result of movement and vibration of molecules. Potential energy is associated with an object's position.

Energy from electromagnetic waves: Electromagnetic waves, such as light, carry energy in the form of photons. These waves can be used to transfer energy and gather information. For example, sunlight carries energy from the sun to the Earth, which can be used for photosynthesis in plants.

Energy caused by changes in the structure of a nucleus: Nuclear energy is released when the structure of a nucleus changes, such as in nuclear fission or fusion reactions. This energy is used in nuclear power plants to generate electricity.

Energy resulting from movement and vibration of molecules: Thermal energy, also known as heat energy, is the energy resulting from the movement and vibration of molecules. It is a form of kinetic energy and is responsible for temperature changes and heat transfer.

Energy an object has because of its position: Potential energy is the energy an object possesses due to its position or condition. For example, a raised object has gravitational potential energy, and a compressed spring has elastic potential energy.

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The examples correspond to Radiant Energy (energy from electromagnetic waves), Nuclear Energy (energy caused by changes in a nucleus), Thermal Energy (energy resulting from movement and vibration of molecules), and Potential Energy (energy an object has because of its position).

For the given examples, the corresponding forms of energy are:

These are the major types of energy that correspond to the scenarios described in your question. Each of these forms plays a vital role in different physical and biological systems.

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Answer:

A would definately be the correct answer

Explanation:

Answer: A. Proteins expressing color in butterfly wings mutate to create camouflaging abilities of butterflies.

Explanation:

Adaptation can be define as the changes occurring in living organisms in their physiology, morphology, and genomic. These adaptations allow organisms to survive in adverse environment.

A. is the correct option. It is an example of physiological adaptation. The color of butterfly wings will change due to protein expression. Thus help in camouflaging the predators by color change.

Answer:

3.605N

Explanation:

From the diagram attached, the resultant force can be calculated using pythagoras theorem,

R² = F1² + F2²

R² = 3² + 2²

R² = 9 + 4

R² = 13

R = 3.605N

Note: the square root of R was taken

Answer:

period of orbit around sun ! thats a saturn year

Explanation:

scaler quantity has magnitude only for example mass ,speed,distance,electric current

Answer:

B.

The explanation of the relationship between load and extension is not in Hooke's Law.

Explanation:

Answer:

theory

Explanation:

I just took the test! hope this helps!

The suns gravity pulls on the planets and keeps them in place. Its gravitational pull puts them in orbit around the sun

The role of the sun's gravity is to keep the planets in place.

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Answer:

A divergent boundary is the answer

Explanation:

Answer:

9090 m, 104 s

Explanation:

After the acceleration phase, the rocket reaches a height of:

x = x₀ + v₀ t + ½ at²

x = (0 m) + (0 m/s) (30 s) + ½ (10 m/s²) (30 s)²

x = 4500 m

And it reaches a velocity of:

v = at + v₀

v = (10 m/s²) (30 s) + (0 m/s)

v = 300 m/s

After the fuel runs out, the rocket goes into free fall.  The maximum height reached is:

v² = v₀² + 2a(x - x₀)

(0 m/s)² = (300 m/s)² + 2(-9.8 m/s²)(x - 4500 m)

x ≈ 9090 m

The time to reach maximum height during free fall:

v = at + v₀

0 m/s = (-9.8 m/s²) t + (300 m/s)

t ≈ 30.6 s

And the time to land from the maximum height:

x = x₀ + v₀ t + ½ at²

0 m = (9090 m) + (0 m/s) t + ½ (-9.8 m/s²) t²

t ≈ 43.1 s

So the total time is:

t = 30 s + 30.6 s + 43.1 s

t ≈ 104 seconds

Answer: The correct answer is False.

Explanation: The term "raw data" refers to the data that has not been processed or "clean" for use. A scientific journal is a type of publication that specializes in publishing new researches of the scientific field. These researches contain information, that is considered the end product of processing the raw data. It is most likely that raw data would not be used as it comes in published scientific articles.

Answer: It's false

Explanation:

I got it right on edge.

Answer:

homeostasis!

Explanation:

Answer:

-300 Hz

-450 Hz

Explanation:

As we know that frequency of nth harmonic mode is known as

[tex]f_n = \frac{nv}{2L}[/tex]

now we know that for fundamental mode of frequency we will have

n = 1

[tex]f_o = \frac{v}{2L}[/tex]

so we will have

[tex]f_n = n f_o[/tex]

now given that

[tex]f_o = 150 Hz[/tex]

and also we have

n = integer

so we will have

n = 2

[tex]f = 300 Hz[/tex]

n = 3

[tex]f = 450 Hz[/tex]

Answer:

300 and 450

Explanation:

Answer:

The mass number of an element is the number of protons plus neutrons.

Explanation:

The mass number of an element is the number of protons plus neutrons, so the correct answer is the option C.

The mass number of an element is the sum of the number of protons plus neutrons.

Answer: Option C

Explanation:

The element's mass number refers to the summative number of neutron and proton in the nucleus. In the nucleus there is the total number of protons and neutron, summed together to form the atomic mass.

Atomic mass is similar as the mass number in representation. Therefore, we have the following formula for the mass number,

Mass number of an element=Number of protons+Number of neutrons

C; to get the unit rate or the time it travels per second you divide the total amount traveled by the amount it took to travel. 300/15=20 20•15=300

The average velocity of the car is: C.  20 m/sec.

Given the following data:

To find the average velocity of the car:

Mathematically, average velocity is calculated by using the formula;

[tex]Average \; velocity = \frac{Total \; distance}{Total \; time}[/tex]

Substituting the given parameters into the formula, we have;

[tex]Average \; velocity = \frac{300}{15}[/tex]

Average velocity = 20 meters per seconds.

Therefore, the average velocity of the car is 20 meters per seconds.

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Every moving object has kinetic energy.

The kinetic energy a moving object has is

(half of its mass)

multiplied by

(the square of its speed).

Answer:

18 m, 7.9 m

Explanation:

In the y direction:

y = y₀ + v₀ᵧ t + ½ aᵧ t²

0 = 0 + (v₀ sin 45°) t + ½ (-g) t²

0 = t (v₀ sin 45° - ½ g t)

t = 0, t = 2v₀ sin 45° / g

In the x direction:

x = x₀ + v₀ t + ½ at²

x = 0 + (v₀ cos 45°) t + ½ (0) t²

x = v₀ cos 45° t

Substituting for t:

x = v₀ cos 45° (2v₀ sin 45° / g)

x = v₀² / g

When g = 9.80 m/s², x = 3.0 m:

3.0 = v₀² / 9.80

v₀² = 29.4

On the moon, when g = 9.80/6:

x = 29.4 / (9.80 / 6)

x = 18 m

As you can see, x is inversely proportional to g, so 1/6 the gravity means 6 times the distance.  So on Mars:

x = 3 / 0.38

x = 7.9 m

Answer:

We experience interference while listening to the radio. A radio station works by sending and receiving radio waves. Since the radio waves are being interfered with other waves which must have a wave nature.

The interference is the net result of two individual waves. It can be constructive or destructive interference and is the property of waves and not particles.

This interference is an example of electromagnetic radiation. Thus we experience wave behavior of electromagnetic radiation in our daily communications.

Answer: wave behavior

Explanation:

Answer:

Hypocalcemia is the correct answer.

Explanation:

This disease, hypocalcemia, is usually known as calcium deficiency disease, which happens when calcium levels in the blood are low. If this disease is not taken care of properly, it can lead to cataracts, alteration in the brain, or even osteoporosis (the bones become brittle.)

Answer:

A

Explanation:

I believe it is A because reflection is usually like a mirror or in water the other ones described are refraction or conversion. Hope this helps! :)

"When we swim, we apply force and push the water backward with the help of our hands. In response to this action, the water pushes us forward with an equal force. Thus, in order to move forward and swim, the swimmer pushes the water backward."

-Newton's 3rd law

Answer:

A positive charge with very small charge compared to the charge source of the field

Explanation:

Let's consider an electric field produced by a source charge Q.

In order to test the direction and magnitude of the electric field, we use a positive test charge q. The reason for chosing a positive charge is that a positive charge will move following the directions of the electric field lines (in fact, the positive charge will be repelled from charge Q if charge Q is positive, so it will follow the electric field lines, which point away from the charge).

Moreover, the test charge q must be small compared to charge Q. This is because we don't want to modify significantly the configuration of the electric field, so the test charge q must be negligible compared to charge Q.

Answer:B.As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.

Explanation:

Answer:

B) As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.

Explanation:

As we know that electric motor is based on the concept of torque due to magnetic field on current carrying coil.

Here as the current is passing through the coil the torque on the coil is given as

[tex]\tau = NiAB sin\theta[/tex]

so here the magnetic field due to coil will continuously repelling the current carrying coil as it will move between the magnetic field so direction of current in the coil will change continuously so that it will always repel by the magnetic field and continuously rotated between the magnets

The electron is the subatomic particle that determines an element's reactivity, with the configuration of the outermost or valence shell playing a key role in how readily an element undergoes chemical reactions.

The subatomic particle responsible for determining the reactivity of an element is the electron. The electrons in the outermost subshell, or valence shell, have the most significant interaction with other atoms, as they are farthest from the nucleus. An element is chemically reactive if its valence shell can easily accept or give up electrons. For instance, noble gases like helium and neon have a full valence shell and are very stable—they do not react easily due to their high ionization energies and unwillingness to accept an additional electron. On the other hand, elements like hydrogen have an incomplete valence shell, making them more reactive as they seek stability through reactions with other elements.

Answer:

The baseball's kinetic energy is 120 joules.

Explanation:

The kinetic energy is defined as:

[tex]k_{e} = \frac{1}{2}mv^{2}[/tex]  (1)

Where [tex]k_{e}[/tex] is the kinetic energy, m is the mass and v is the velocity.

The kinetic energy represents how much energy have an object as a consequence of its movement.

For the case of a baseball (m = 0.15 kg, v = 40.0 m/s):

[tex]k_{e} = \frac{1}{2}(0.15kg)(40.0m/s)^{2}[/tex]

[tex]k_{e} = 120 Kg.m^{2}/s^{2}[/tex]

But 1 j = [tex]kg.m^{2}/s^{2}[/tex]

[tex]k_{e} = 120 j[/tex]

Hence, baseball's kinetic energy is 120 joules.

Answer:

539 kPa

Explanation:

Pressure equals density times acceleration of gravity times depth.

P = ρgh

Water has a density of 1000 kg/m³, and acceleration of gravity is 9.8 m/s².

P = (1000 kg/m³) (9.8 m/s²) (55.0 m)

P = 539,000 Pa

P = 539 kPa