In the absence of air resistance and friction, what will happen to the velocity of an object going at 20 m/s E?

Answer: a. many people think that no energy or matter exists outside the universe.

Explanation: The universe isolated because everything is within it and nothing is on the outside. There is no exchange of energy or matter between the universe and its surroundings. Thus since it is isolated, there can be no exchange of energy with anything.

If a charged particle is projected with its initial velocity parallel to a uniform magnetic field, then the resulting path would be a straight line parallel to the field, therefore the correct answer is option 3.

A magnetic field could be understood as an area around a magnet, magnetic material, or an electric charge in which magnetic force is exerted .

As given in the problem if a  charged particle is projected with its initial velocity parallel to a uniform magnetic field then we have to find out what would be the resulting path of the particle .

Thus , the right response is option 3, as the path of a charged particle projected with its starting velocity parallel to a uniform magnetic field would be a straight line parallel to the field .

Learn more about the magnetic fields here , refer to the link ;

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Sedimentary rock is formed from the compaction and cementation of sediment originating from other rocks or organic material. This process results in various types of sedimentary rocks, like sandstone and shale.

The type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together is known as sedimentary rock. These rocks are created through a multi-step process starting with the deposition of sediment that comes from the weathering and erosion of pre-existing rocks (clasts), or from the accumulation of plant and animal material. Over time, these deposited sediments may harden into rock through two main processes:

Compaction: where sediments are squeezed together under the weight of sediments above them.

Cementation: where minerals fill in the spaces between the loose sediment particles.

This process creates various types of sedimentary rocks, such as clastic rocks which are fragments compacted and cemented together, and organic sedimentary rocks which are formed from the lithification of organic material. Examples of sedimentary rocks include sandstone, formed from cemented sand; shale, formed from compressed mud and silt; and conglomerate, composed of cemented gravel and pebbles.

Answer:

f = 3×10¹¹ Hz

Explanation:

Relation ship between frequency and wavelength

"The wave speed (v) is defined as the distance traveled by a wave per unit time. If considered that the wave travels a distance of one wavelength in one period,

ν=λ/T

As we know that T = 1/f, hence we can express the above equation as,

V = f λ

The wave speed is equal to the product of its frequency and wavelength, and this implies the relationship between frequency and wavelength."

The relation between frequency and wavelength is  

λ×f = c

c = speed of light = 3×10⁸ m/s

λ = 1.00 mm = 10⁻³ m

f=c/λ

f=(3×10⁸ m/s)/   10⁻³ m

f = 3×10¹¹ Hz

The answer is B i know this because i just did it on usatestprep

The wave speed is calculated using the frequency and the wavelength. With the provided distance between crests (1.20 m) and the time for crests to pass (13 s), the wave speed is found to be approximately 0.8308 m/s.

The distance between two successive crests of a transverse wave is equal to one wavelength. If eight additional crests pass a given point in 13 seconds, it means that nine crests in total pass that point in 13 seconds because the first crest is observed at the beginning of the timing. The speed of the wave (v) can be calculated using the formula v = frequency x wavelength. Here, the wavelength (λ) is given as 1.20 meters.

To find the frequency, we use the number of waves passing a point divided by the time taken. Therefore, the frequency (f) is 9 crests / 13 seconds = 0.6923 Hz (where Hz represents Hertz or cycles per second).

Using the wave speed formula, we obtain the speed: v = 0.6923 Hz x 1.20 m = 0.8308 m/s. Thus, the wave speed is approximately 0.8308 meters per second.

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I₁ = initial moment of inertia before pulling in the arms

I₂ = final moment of inertia after pulling in the arms = I₁ /2

w₁ = initial angular velocity before pulling in the arms

w₂ = final angular velocity after pulling in the arms

using conservation of angular momentum

I₁ w₁ = I₂ w₂

I₁ w₁ = (I₁/2 ) w₂

w₂ = 2 w₁

KE₁ = initial rotational kinetic energy before pulling in the arms = (0.5) I₁ w²₁

KE₂ = final rotational kinetic energy after pulling in the arms = (0.5) I₂ w²₂

Ratio of final rotational kinetic energy to initial rotational kinetic energy is given as

KE₂ /KE₁ = (0.5) I₂ w²₂/((0.5) I₁ w²₁ )

KE₂ /KE₁ = ((I₁/2 ) (2 w₁)²)/(I₁ w²₁)

KE₂ /KE₁ = 2

KE₂ = 2 KE₁

hence the kinetic energy becomes twice

The iron kettle must absorb 33,768 joules of heat energy to raise its temperature from 15.0 Celsius to 93.0 Celsius.

To calculate the amount of heat the iron kettle must absorb, we can use the formula:

q = mcΔT

where:

Plugging in the given values:

q = (920g) x (0.470 J/g°C) x (93.0°C - 15.0°C)

q = (920g) x (0.470 J/g°C) x (78.0°C)

q = (920g) x (36.66 J/°C)

q = 33768 J

Therefore, the iron kettle must absorb 33,768 joules of heat energy to raise its temperature from 15.0 Celsius to 93.0 Celsius.

1 is c

2 is c

3 is d

4 is b

5 is d

6 is d

7 is a

8 is a

9 is c

10 is d

i hope my answers help you

Stress responses, including the fight or flight response, are psychophysiological reactions that can prepare an organism for stressful situations. Chronic stress can lead to negative health effects, including illness and increased vulnerability to heart disease, particularly in individuals with a Type A personality. These concepts can help to understand the effects of stress on health.

The fight or flight response (c) prepares an organism to respond to stress. Stress (c) is a psychophysiological response. According to the American Psychological Association, the most significant source of stress for Americans is (d) Money. A common source of stress for both teens and adults is (b) Relationships. Stress can be beneficial by (d) Increasing energy. Chronic stress can result in all of the following except (d) improved concentration. People who experience chronic stress are more vulnerable to (a) illness. A Type A personality has been linked to (a) higher rates of heart disease. Characteristics of a Type B personality include (c) a low sense of time urgency. Friedman and Rosenman concluded from their study that (d) a Type A personality increases a person's levels of stress, which in turn increases vulnerability to CHD.

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Answer:

E = 400 V/m

Explanation:

It is given that, for a parallel plates :

Potential difference, V = 12 volts

Separation between the plates, d = 3 cm = 0.03 m

The relation between the electric field and the electric potential is given as :

[tex]E=\dfrac{V}{d}[/tex]

[tex]E=\dfrac{12\ V}{0.03\ m}[/tex]

E = 400 volts/m

So, the strength of the electric field is 400 V/m.                

The energy of exactly one photon of this microwave radiation is 1.53 × 10⁻²⁴Joule

The term of package of electromagnetic wave radiation energy was first introduced by Max Planck. He termed it with photons with the magnitude is:

[tex]\large {\boxed {E = h \times f}}[/tex]

E = Energi of A Photon ( Joule )

h = Planck's Constant ( 6.63 × 10⁻³⁴ Js )

f = Frequency of Eletromagnetic Wave ( Hz )

The photoelectric effect is an effect in which electrons are released from the metal surface when illuminated by electromagnetic waves with large enough of radiation energy.

[tex]\large {\boxed {E = \frac{1}{2}mv^2 + \Phi}}[/tex]

[tex]\large {\boxed {E = qV + \Phi}}[/tex]

E = Energi of A Photon ( Joule )

m = Mass of an Electron ( kg )

v = Electron Release Speed ( m/s )

Ф = Work Function of Metal ( Joule )

q = Charge of an Electron ( Coulomb )

V = Stopping Potential ( Volt )

Let us now tackle the problem!

Given:

λ = 13.0 cm = 13.0 × 10⁻² m

Unknown:

E = ?

Solution:

[tex]E = h f[/tex]

[tex]E = h \frac{c}{\lambda}[/tex]

[tex]E = 6.63 \times 10^{-34} \frac{3 \times 10^8}{13.0 \times 10^{-2}}[/tex]

[tex]\large {\boxed {E = 1.53 \times 10^{-24} ~ Joule } }[/tex]

Grade: High School

Subject: Physics

Chapter: Quantum Physics

Keywords: Quantum , Photoelectric , Effect , Threshold , Frequency , Electronvolt

Answer:

The change in momentum increases because the impact time increases.

Explanation:

When a baseball player catches a baseball, the glove "gives" or moves backward. Momentum of a body is equal to the product of mass and velocity. Also, the change of momentum of an object when it is acted by a force is called impulse. It is represented by J. Mathematically, it can be written as :

[tex]J=F.\Delta t=m\Delta v[/tex]

F is applied force

[tex]\Delta t[/tex] is the time taken by an object to change its momentum

The momentum depends on the force and the time of impact. In this case, as the a baseball player catches a baseball, the gloves move in backward direction. By doing so, the ball comes to rest in larger time.

So, the change in momentum increases because the impact time increases.

It is a longitudinal wave. In a longitudinal wave the particles of the medium vibrate in a direction parallel to the direction of energy transport. Sound waves are mechanical waves as well as longitudinal waves that require a medium. They do not travel through a vacuum.

Answer :

Radioactive decay : It the process in which an unstable atomic nucleus loses energy by emitting the radiations like, alpha particles, beta particles, or gamma rays.

Final answer:

The wavelength corresponding to the most intense light emitted by a giant star with a surface temperature of 4400 K is approximately 681.8 nm.

Explanation:

According to Wien's law, the wavelength at which the most intense light is emitted by a giant star can be determined using the formula:
wavelength = 3 x 10^6 / temperature

In this case, the surface temperature of the giant star is 4400 K. Plugging in this value into the formula, we get:
wavelength = 3 x 10^6 / 4400 = 681.8 nm

Therefore, the wavelength corresponding to the most intense light emitted by the giant star is approximately 681.8 nm.

The speed at which the ball hits the ground, the time it remains in the air, and the maximum height it attains can be calculated using the initial vertical and horizontal velocities and the acceleration due to gravity.

Given the ball is launched with an initial horizontal velocity (Vx) of 22 m/s and a vertical velocity (Vy) of 13 m/s. The acceleration due to gravity (g) is -9.81 m/s2.

(a) Speed when the ball hits the ground:

Using the kinematic equation, we have Vy_final = Vy - g*t, where t is the time. The total final velocity as the ball hits the ground is given by V_final = sqrt(Vx2 + Vy_final2).

(b) Time the ball remains in the air:

The ball reaches its maximum height when Vy_final=0. So, 0=Vy-g*t => t=Vy/g. As the motion is symmetrical, the total time in air would be 2*t.

(c) Maximum height attained:

Using the formula for maximum height H = Vy2/2g.

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Answer:

-left-right reversed

-upright

-virtual

I just did this in my lesson.

Answer:

The average velocity, expressed as a vector, is v=30 m/s with direction north.

Explanation:

In this case, we will obtain a vector velocity, and the correct answer will be expressed as a vector. But as the movement happens only along a straight line (with direction to the north from the point of rest), we can do the math calculation as a one-dimensional problem. Then the final velocity will be a vector with the calculated magnitude, pointing to the north, as we already know.

The question is simple, as we were given the distance in meters that the object moved in a straight line, and the time in seconds that took the object to move that distance, we have the correct units and we can write the average velocity as

[tex]v=\frac{d}{t}[/tex]

where d is the distance, and t is the time. Therefore

[tex]v=\frac{60m}{2s}=30\frac{m}{s}[/tex]

which is the magnitude of the velocity we wanted to know, then we express it as vector saying its direction (north, for our system of reference).

To answer the problem we would be using this formula which is E = hc/L where E is the energy, h is Planck's constant, c is the speed of light and L is the wavelength

L = hc/E = 4.136×10⁻¹⁵ eV·s (2.998x10⁸ m/s)/10⁴ eV

= 1.240x10⁻¹⁰ m

= 1.240x10⁻¹ nm

The strength of the magnetic field at a distance of 1.2 mm from a typical axon carrying a peak current of 0.040 μA is 0.667 nanotesla (nT).

To determine the strength of the magnetic field at a distance of 1.2 mm from a current-carrying axon, we can use the formula for the magnetic field around a long straight wire: B = (μ₀ * I) / (2π * r), where B is the magnetic field, μ₀ is the permeability of free space (4π × 10⁻⁷ T*m/A), I is the current, and r is the distance from the wire.

Calculating the Magnetic Field:

Therefore, the strength of the magnetic field at a distance of 1.2 mm from a typical axon carrying a peak current of 0.040 μA is 0.667 nanotesla (nT).

Answer:

458.826 watts

Explanation:

According to Stefan-Boltzmann's Law, thermal energy emitted by a black body per second per unit area is directly proportional to the fourth power of the absolute temperature and is given by;

[tex]\frac{P}{A}[/tex] = σ[tex]eT^{4}[/tex]

P = ?

A = l x c = 2 x 0.8 = [tex]1.6m^{2}[/tex]

(Please ignore Armstrong symbol, I don't know how it appeared using the equation tool)

σ = [tex]5.6703 X 10^{-8}  watt/m^{2} K^{4}[/tex]

e = 0.6

T = [tex]30^{o} C[/tex] = 303 K

P = σeTA

P = [tex]5.6703 X 10^{-8}[/tex] x 0.6 x [tex]303^{4}[/tex] x 1.6

P = 458.826 watts

Answer:

4500

Explanation: