Hey!Can someone solve my question??

Answer:

a model would be very benaficial to a scientest because they need them

Explanation:

1 model for eachscientest

At the bottom of the slide, the child's potential energy is transformed into kinetic energy, some of which is lost to friction and heat generation between the contact surfaces.

total change in the thermal energy is U= 743.4 J

mass of the child, m1= 23kg

height of the slide, h= 3.3 mm

initial velocity of the child at the slide, v1= 0

final velocity of the child at the bottom of slide, v2= 1.6 m/c

(a)

∴At the bottom of the slide, the child's initial potential energy is transformed into kinetic energy, some of which is lost to friction which produces heat between the contact surfaces.

potential energy:  PE=mgh.

PE= 23*9.8*3.3

PE= 776.15 J

Kinetic energy at the bottom  slide:

K.E. = 1/2 m v2

KE= 30.72 j

(b)

The entire change in the thermal energy of the slide and the seat of her pants is now equal to the difference between the potential and kinetic energies.

This can be given as:

U= PE-KE

U= 776.15-30.72

U= 743.4 J

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North pole

According to the law of magnetism:

Unlike poles attract while like poles repel

Since the south pole of the steel is brought near the nail, and the nail is meant to attract the steel magnet, the nail domain realigns itself to produce a pole opposite to the pole of the steel magnet brought near it.

Since the North pole is the opposite of the south pole, the North pole will be at the pointed end of the nail so that it can attract the steel magnet.

The distance that a body in free fall falls each second is (A). is about 9.8m is correct option.

The distance that a body in free fall falls each second is about 9.8 meters, which is equivalent to the acceleration due to gravity on the Earth's surface.

This means that in the absence of air resistance, an object dropped from a certain height will fall 9.8 meters during the first second, 19.6 meters during the second second, 29.4 meters during the third second, and so on. The distance increases as time passes, but not at a constant rate, as it is being affected by the acceleration due to gravity.

Therefore, the correct option is (a) .

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It's false. The length of the vector is going to remain the same but the direction is going to change.

Answer:

F₁ = 4 F₀

Explanation:

The force applied on the string by the ball attached to it, while in circular motion will be equal to the centripetal force. Therefore, at time t₀, the force on ball F₀ is given as:

F₀ = mv₀²/r   --------------- equation (1)

where,

F₀ = Force on string at t₀

m = mass of ball

v₀ = speed of ball at t₀

r = radius of circular path

Now, at time t₁:

v₁ = 2v₀

F₁ = mv₁²/r

F₁ = m(2v₀)²/r

F₁ = 4 mv₀²/r

using equation (1):

F₁ = 4 F₀

Time = t = 6.62 s

Explanation:

Given data:

Height = h = 215 m

Initial velocity =  = 0 m/s

gravitational acceleration = g = 9.8 m/s²

Time = t = ?

According to the second equation of motion

As the initial velocity is zero, the first term of right-hand side of the above equation is equal to zero.

                                       t² = 2h/g

                                        t = square root 2h/g

                                        t = square root 2x215/9.8

                                        t = 6.62 s

Answer:

1. The de Broglie wavelength of the electron decreases if its momentum increases.

b. The de Broglie wavelength of the electron decreases is the correct answer

2. The de Broglie wavelength of the electron increases as the kinetic energy decreases.

a. The de Broglie wavelength of the electron increases is the correct option

Explanation:

1. The relationship between de Broglie wavelength, λ and momentum ρ is given by

λ = h/ρ

Where λ is the de Broglie wavelength

h is Planck's constant and

ρ is the momentum

From the formula, the de Broglie wavelength, λ varies inversely with the momentum, ρ. Hence, as the de Broglie wavelength increases the momentum decreases; similarly, as the de Broglie wavelength decreases, the momentum increases.

For question 1, The de Broglie wavelength of the electron decreases if its momentum increases.

b. The de Broglie wavelength of the electron decreases is the correct answer

2. From

λ = h/ρ

ρ = mv

∴ λ = \(\frac{h}{mv}\)

Where m is mass

and v i velocity

Recall that Kinetic energy K.E is given by

K.E = \(\frac{1}{2}mv^{2}\)

\(E_{K} = \frac{1}{2}mv^{2}\)

\(E_{K}\) is the kinetic energy

∴ \(v = \sqrt{\frac{2E_{K} }{m} }\)

Now we will evaluate \(mv\)

\(mv = m \sqrt{\frac{2E_{K} }{m} }\\mv = \sqrt{m^{2} }.\sqrt{\frac{2E_{K} }{m} }\\ mv = \sqrt{\frac{2m^{2}E_{K} }{m} } \\mv = \sqrt{{2mE_{K} }\)

∴ λ = \(\frac{h}{mv}\) becomes

λ = \(\frac{h}{\sqrt{2mE_{K} } }\)

This equation shows the relationship between the de Broglie wavelength and kinetic energy, \(E_{K}\)

From the equation, de Broglie wavelength varies inversely with kinetic energy. That is, as the de Broglie wavelength increases the kinetic energy decreases; similarly, as the de Broglie wavelength decreases, the kinetic increases.

For question 2, The de Broglie wavelength of the electron increases as the kinetic energy decreases.

a. The de Broglie wavelength of the electron increases is the correct option

Answer:

c  sodium chloride

Explanation:

because i took the test

Answer:

C

Explanation:

Answer: B. DLC

B. Visual Updates

B. Competition and expectations

D. Every three months

D. Game expansion packs

C. Visual updates

A. Game expansion

C. Concept art books

A. Create DLC

A. Check licensing agreements

D. Separate her personal finances from the business finances

B. Soundtrack

C. Group dynamics

C. To open a business bank account

B. Onboarding activities

Explanation: :)

Answer:

120 v

Explanation:

The two resistors have an equivalent of    20 * 30 /(20+30) = 12 ohms

  10 amps of current in the circuit

v = ir

  = 10 * 12 = 120 volts

Here is another way:

The two resistors are in prallel so the voltae across both is the same

  use the one on the right      v = ir     =   4 x 30 = 120 v

Answer:

Below

Explanation:

You can use this formula to find the density of something

     density = mass / volume

Plugging our values in.....

     density = 13.2 / 14

     density = 0.9428571429 g/mL

Rounding to sig figs we get....

     density = 0.94 g/mL

Hope this helps! Best of luck <3

Answer:

\(\huge\boxed{\sf Density = 0.94\ g/mL}\)

Explanation:

Given:

Volume = 14 mL

Mass = 13.2 g

Required:

Density = ?

Formula:

Density = Mass / Volume

Solution:

Density = 13.2 / 14

Density = 0.94 g/mL

\(\rule[225]{225}{2}\)

Hope this helped!

Answer:

   ω = ω₀ + α t

      ω² = ω₀² + 2 α  θ

      θ = θ₀ + ω₀ t + ½ α t²

Explanation:

Rotational kinematics can be treated as equivalent to linear kinematics, for this change the displacement will change to the angular displacement, the velocity to the angular velocity and the acceleration to the angular relation, that is

     x → θ

     v → ω

     a → α

with these changes the three linear kinematics relations change to

      ω = ω₀ + α t

      ω² = ω₀² + 2 α  θ

      θ = θ₀ + ω₀ t + ½ α t²

where it should be clarified that to use these equations the angles must be measured in radians

The frictional force of an object is the product of the normal force and coefficient of kinetic friction. Here the frictional force acting on the object  is 16.4 N.

Frictional force is a kind of force acting on a body to resist it from motion. Thus, the direction of the force will be in negative with the magnitude. Frictional force is the product of coefficient of friction and the normal force.

The normal  force acting on the object of mass 4.2 Kg is N = mg

N = 4.2 Kg × 9.8 m/s² = 41.16 N

Frictional force = ц N

                         = 0.40 × 41.16 N

                         = 16.4 N.

Therefore, the frictional force acting between the surface of the object and the floor is 16.4 N

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Your question is incomplete. But your complete question probably was:

The coefficient of kinetic friction between an object and the surface upon which it is sliding is 0.40 the weight of the object is 4.2 kg. What is the frictional force of the object?

Answer:

The focal length of the mirror is 10.4 cm.

Explanation:

So substitute the values of object distance and image distance in the mirror equation,

1/f = 1/(-18cm) + 1/(-25.0cm)

1/f = -25cm/(-18cm x -25cm) - 18cm/(-18cm x 25cm)

1/f = ( -25cm - 18cm)/(18cm x 25cm)

1/f = -43.0/450.0

f = -10.4651 cm.

The focal length of the mirror is approximately -10.4 cm.

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The rate as which the current in it is changing is 252 A/s.

For an inductor carrying a current the rate of change of the current is calculated by applying the following formula as shown below.

di/dt = E/L

where;

The rate as which the current in it is changing is calculated as follows;

di/dt = 1.26 V / ( 5 x 10⁻³ )

di/dt = 252 A/s

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The pressure exerted by a rectangular block on the ground is 8 Pascal (Pa) when its weight is 320 N and its dimensions are 4 meters by 10 meters. The greatest pressure occurs when the block is vertically placed at 20 Pa, while the least pressure occurs when it is horizontally placed at 8 Pa.

To calculate the pressure exerted by the rectangular block on the ground, we need to consider the formula for pressure:

Pressure = Force / Area

Given that the weight of the block is 320 N and the dimensions of the block are 4 meters by 10 meters, we can calculate the area of the block in contact with the ground. In this case, it is the length multiplied by the width of the block.

Area = length * width

Area = 4 meters * 10 meters

Area = 40 square meters

Now, we can calculate the pressure exerted by the block on the ground:

Pressure = 320 N / 40 square meters

Pressure = 8 N/m^2 (Pascal)

Therefore, the pressure exerted by the rectangular block on the ground is 8 Pascal (Pa).

To determine the greatest pressure and the least pressure that can be exerted on the ground, we need to consider the orientation of the block.

The greatest pressure occurs when the block is placed vertically on one of its smallest faces. In this case, the entire weight of the block (320 N) is concentrated on a smaller area.

The area in contact with the ground is given by the length multiplied by the width of the smallest face.

Area = 4 meters * 4 meters = 16 square meters

Greatest Pressure = 320 N / 16 square meters = 20 \(N/m^2\)(Pascal)

The least pressure occurs when the block is placed horizontally on one of its largest faces. In this case, the weight of the block is distributed over a larger area.

The area in contact with the ground is given by the length multiplied by the width of the largest face.

Area = 4 meters * 10 meters = 40 square meters

Least Pressure = 320 N / 40 square meters = 8 \(N/m^2\)(Pascal)

Therefore, the greatest pressure that can be exerted on the ground is 20 Pascal (Pa), and the least pressure is 8 Pascal (Pa).

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The man's friend is at a distance 552.5 m away.

Speed of sound in air, v = 340 m/s

Time after which the echo is heard, t = 3.25 s

The expression for the total distance covered by the sound in the given time,

d = v x t

d = 340 x 3.25

d = 1105 m

Therefore, the distance where the friend is staying would be half of the total distance covered by the sound during the given time.

So, the distance of the friend from the man,

d' = d/2

d' = 1105/2

d' = 552.5 m

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Answer:

Explanation:

Voltage and Current relation is given by V=IR
I=9A

R=4Ohm

V=IR
V=9x4=36Volts

Resistance = 4 Ohm

Current = 9 Ampere

Voltage = 36 Volts

Answer:

Mediums in which the speed of sound is different generally have differing acoustic impedances, so that, when a sound wave strikes an interface between

Explanation:The propagation of a wave through a medium will depend on the properties of the medium. For example, waves of different frequencies may travel

There will be exchange of heat in the system, the tub filled with ice will gain heat, while the bottle of liquid will lose heat.

The flow is made possible by means of convection which implies heat flow from region of higher concentration to region of low concentration

by actual movement of material particles

There are basically three modes of heat transfer

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Explanation:

if you go to connexus and are doing the science

Thermal Energy Unit Test 10 qestions 8th grd unit 5 test lesson 12 here are the correct answers

1. A. metal is heated from room temperature to 200'C.

2. B. The particles will have more space between them as steam, but they will be moving at the same speed in both states.

3. C. The potential energy decreases due to the tighter arrangement of the particles.

4. B. an increase in heat and an increase in kinetic energy until a phase change occurs.

5. C. thermometer

6. B. 4.

7. D. convection

8. C. Air moves from the areas of higher temperature to areas of lower temperature.

9. C. The temperature of the ice increases, while the temperature of the water decreases

10. A. heat transfer by radiation.

i hope this helps and please let me know if it does! = ) <3

Answer:

D is the answer.

Explanation:

Just do it.

Answer:

D

Explanation

just took the test

The period of the oscillator and the damping coefficient.

Generally, the equation for is  mathematically given as

If we see cycles between the timestamps t= 0s and t= 4s, we may deduce that it completes three cycles each and every four seconds. Therefore, the amount of time required to complete one cycle of damping will be

t =4/3sec

t= 1.33s

Generally, the equation for amplitude is  mathematically given as

\(A = A_0e^{-bt}\)

Therefore

\(3 = 5e^{-12b}\)

\(0.6 = e^{-12b}\)

Therefore

-0.511 = -12b lne

b = 0.0426 s^{-1}

In conclusion, An influence that acts either from inside an oscillatory system or onto it and has the effect of diminishing or stopping the system from oscillating is known as damping. In physical systems, damping is created by processes that dissipate the energy that is stored in the oscillation. These processes are called "damping agents.". Hence the damping coefficient is

b = 0.0426 s^-1

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Answer:

The charge in each ball will be 3 * 10^-12 C

Explanation:

(Assuming the correct charge of the second ball is 8 * 10^-12)

When the balls are brought in contact, all the charges are split evenly among then.

So first we need to find the total charge combined:

(-3 * 10^-12) + (8 * 10^-12) + (4 * 10^-12) = 9 * 10^-12 C

Then, when the balls are separated, each ball will have one third of the total charge, so in the end they will have the same charge:

(9 * 10^-12) / 3 = 3 * 10^-12 C

So the charge in each ball will be 3 * 10^-12 C

Complete Question

When you ascend or descend a great deal when driving in a car yours ears "pop," which means that the pressure behind the eardrum is being equalized to that outside. If this did not happen, what would be the approximate force on an eardrum of area .50 cm2 if a change in altitude of 950 m takes place?

Answer:

The value is \(F = 0.60 \ N\)

Explanation:

From the question we are told that

   The area of the ear drum is  \(A = 0.5 \ cm^2 = 0.50 *10^{-4} \ m^2\)

    The change in altitude is  \(\Delta d = 950 \ m\)

Generally the change in pressure is mathematically represented as

       \(\Delta P = \frac{F}{A}\)

This can also be mathematically represented as

      \(\Delta P = \rho * g * \Delta d\)

So

       \(\frac{F}{A} = \rho * g * \Delta d\)

=>    \(F = \rho * g * \Delta d * A\)

=>    \(F = \rho * g * \Delta d * A\)

Here \(\rho\) is the density of dry air with value  \(\rho = 1.29 \ kg /m^3\)

So

     \(F = 1.29 * 9.8 * 950 * 0.50 *10^{-4}\)

=> \(F = 0.60 \ N\)

If this did not happen, 0.60 N would be the approximate force on an eardrum of area 0.22 cm2 if a change in altitude of 1500 m takes place

A fundamental idea in physics, force is defined as any effect that has the ability to accelerate, deform, or change the state of motion of an object. It is a vector quantity, hence it has both a direction and a magnitude. The most basic definition of force is the push or pull that one object exerts on another.

A = 0.5 cm²

  = 0.50×\(10^{-4}\) m²

\(\Delta d\)=950 m

change in pressure = force/ area

\(\Delta P = p\times g\times \Delta d\)

F= \(p\times g\times \Delta d \times A\)

Density= 1.29 \(\rm kg/m^3\)

F = \(\rm 1.29\times 9.8\times 950\times 0.50\times 10^{-4}\)

F =0.60 N

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Your question is incomplete but most probably your full question was,

When you ascend or descend a great deal when driving in a car, your ears "pop" which means that the pressure behind the eardrum is being equalized to that outside. If this did not happen, what would be the approximate force on an eardrum of area 0.22 cm2 if a change in altitude of 1500 m takes place

Grouping data refers to the process of categorizing or organizing data based on specific criteria or attributes.

It involves grouping similar data points together to gain a better understanding of patterns, relationships, and trends within the dataset. By grouping data, you can simplify complex information and derive meaningful insights from large amounts of data. The purpose of grouping data is to create subsets or clusters that share common characteristics.

This enables easier analysis, summarization, and comparison of data within each group. Grouping can be performed on various types of data, such as numerical, categorical, or time-based data. Grouping data allows for the exploration of data at different levels of granularity.

For example, you can group sales data by region to analyze regional performance, or group customer data by demographics to identify specific customer segments. This process helps in identifying outliers, detecting patterns, and making data-driven decisions.

Common techniques for grouping data include using functions like GROUP BY in SQL or utilizing data visualization tools to create charts or graphs that illustrate the grouped data. Grouping can be applied in various fields, such as marketing, finance, healthcare, and research, to uncover insights and support decision-making processes.

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