Im need some help with this please

Answer:

E = 5.65 x 10¹⁰ N/C

Explanation:

First we need to find the total charge on the sphere. So, we use the following formula for that purpose:

[tex]q = \sigma V\\[/tex]

where,

q = total charge on sphere

V = Volume of Sphere = [tex]\frac{4}{3} \pi r^3 = \frac{4}{3} \pi (0.08\ m)^3 = 0.335\ m^3[/tex]

σ = volume charge density = 1.5 C/m³

Therefore,

[tex]q = (0.335\ m^3)(1.5\ C/m^3) \\q = 0.502 C[/tex]

Now, we use the following formula to find the electric field due to this charged sphere:

[tex]E = \frac{kq}{r^2}[/tex]

where.

E  = Electric Field Magnitude = ?

k = Coulomb's Constant = 9 x 10⁹ N.m²/C²

r = radius of sphere = 8 cm = 0.08 m

Therefore,

[tex]E = \frac{(9\ x\ 10^9\ Nm^2/C^2)(0.502 C)}{(0.08\ m)^2}\\\\[/tex]

E = 5.65 x 10¹⁰ N/C

Answer:

The value is [tex]\eta _2 = 0.57[/tex]

Explanation:

From the question we are told that

    The temperature of the heat source is [tex]T_s = 1000 \ K[/tex]

    The amount of power transferred is  [tex]P_s = 1000 \ kW = 1000 *10^{3} \ W[/tex]

      The work produced is  [tex]W = 400 \ kW[/tex]

       The temperature of the environment [tex]T_e = 300 \ K[/tex]

Gnerally the Carnot efficiency of the system is mathematically represented as

        [tex]\eta_c = 1 -\frac{T_e}{T_s}[/tex]

=>    [tex]\eta_c = 1 -\frac{300}{1000}[/tex]

=>      [tex]\eta_c = 0.7[/tex]

Generally the first  law efficiency of the system is mathematically represented as

            [tex]\eta _1 = \frac{W}{P_s}[/tex]

=>         [tex]\eta _1 = \frac{400}{1000}[/tex]  

=>         [tex]\eta _1 = 0.40[/tex]

Generally the second  law efficiency of the system is mathematically represented as

                [tex]\eta _2 = \frac{\eta_1}{\eta_c}[/tex]

=>               [tex]\eta _2 = \frac{0.4}{0.7}[/tex]

=>               [tex]\eta _2 = 0.57[/tex]

Answer:

I do not know the answer because not all of the information is there.

Explanation:

Answer:

Beep Beep

Explanation:

Answer:

D mass of the iron rod

Explanation:

A) the length of the iron rod.

B) the thermal conductivity of iron.

C) the temperature difference between the ends of the rod.

D) the mass of the iron rod.

E) the duration of the time interval

The amount of heat that will flow through an iron rod whose two ends are maintained at different temperatures would depend on the thermal conductivity of the iron, the temperature difference between the two ends, the length of the iron rod, and the duration of flow of heat.

The thermal conductivity of any material is an indication of the ability of the materials to conduct heat. The higher the thermal conductivity, the higher the amount of heat a material can conduct within a specified period. Hence, the amount of heat that will flow through the iron rod depends on its thermal conductivity.

The temperature difference between two solid materials depends on the amount of heat that will flow across the materials by conduction. The higher the difference, the more the amount of heat that will flow. Hence, the amount of heat that would be conducted depends on the temperature difference between the two ends of the iron rod

The amount of heat that would move my conduction also depends on the distance that would be traveled by the heat. Due to heat loss to the surrounding, the shorter the distance, the more the heat and vice versa. Hence, the amount of heat that will flow through an iron rod depends on the length of the iron rod.

The duration of flow also dictates the amount of heat that will flow between two regions by conduction. The more the duration, the more the heat, provided that other conditions remain constant.

The only option that the amount of heat that would be conducted does not depend on is the mass of the iron rod.

The correct option is D.

Answer:

km = 3.24

m = 3,240

dm = 32,400

Explanation:

km = 1000m

m = 10dm

Explanation:

take a look carefully hope it will help u

Answer:

The change in momentum is 28265.71  kg-m/s.

Explanation:

Given that,

Mass of a car, m = 877 kg

Initial velocity of the car, u = 0 (at rest)

Final velocity of the car, v = 116 km/h = 32.23 m/s

Time, t = 0.951 s

We need to find the change in momentum produced by the force. It can be calculated as the difference of final momentum and the initial momentum.

[tex]\Delta P=m(v-u)\\\\=877\times (32.23-0)\\\\=28265.71\ kg-m/s[/tex]

So, the change in momentum is 28265.71  kg-m/s.

Answer:

4.16m/s²

Explanation:

According to Newtons second law;

[tex]\sum Fx = ma_x\\Fm - Ff = ma_x\\W sin\theta - \mu R cos \theta = ma_x\\mg sin\theta - \mu mg cos\theta = ma_x\\[/tex]

Fm is the moving force

[tex]\mu[/tex] is  the coefficient of kinetic friction between the child and the slide

m is the mass

g is the acceleration due to gravity

a is the acceleration of the child

Substitute the given values and get the acceleration as shown;

35(9.8)sin27.5 - 0.415(35)(cos27.5) = 35a

158.38-12.88 = 35a

145.49 = 35a

a = 145.49/35

a = 4.16m/s²

Hence the acceleration of the body is  4.16m/s²

[tex]We \: know \: that, \: c = λv \\ thus \: \: λ = \frac{c}{v} = \frac{3 \times {10}^{8} \: m {s}^{ - 1} }{94.7 \times {10}^{6} } \\ = 3.16789863≈3.17 \: m[/tex]

Hope this helps :)

Answer:

V = 5.55 volts

Explanation:

Given that,

Current, I = 3.7 A

Resistance, R = 1.5 ohms

We need to find the voltage of the circuit. Let V is the voltage. We can find it using Ohm's law as follows :

V = IR

Substituting all the values, we get :

[tex]V=3.7\times 1.5\\\\=5.55\ V[/tex]

So, the voltage of the circuit is 5.55 V,

Answer:

it is all because of nature

Answer:

Explanation: 1.2 mm

Time= 140 sec

Initial Velocity= 0

Average Velocity= 2.4 mm/s

Displacement=  0.5* (2.4/140) *140 = 1.2 mm

0.3 m/s^2 left will be  the acceleration of the couch.

we have given in the statement

force towards left  40 N

force towards right 32 N

net force = 40-32 = 8 N towards left

couch  mass = 28 kg

now we will use newtons 2nd law to find acceleration

F=ma, here f is force m is mass a is acceleration

a=F/m

a=8/24

a=0.285 ≅ 0.3 N

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0.3 m/s squared left Answer:

Explanation:

The work done by the applied force of 15 Newton to lift the object up 3 meters is 45 J

W = F d

W = Work done

F = Force

d = Distance

F = 15 N

d= 3 m

W = 15 * 3

W = 15 J

Work done is the amount of force required to move an object. It is denoted by W. Its unit is usually Joules.

Therefore, the work done to lift the object is 15 J

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Answer:

Weight:

P =m·g₁ = 20·9.55 = 191 H

Explanation:

Given:

R = 6 370 км = 6 370·10³ m

m = 20 kg

h = 160 km = 160·10³ m

g = 9.8 m/s²

____________________

P - ?

Acceleration of free fall at the Earth's surface:

g = G*M / R²    (1)

Acceleration of free fall at height h:

g₁ = G*M / (R + h) ²    (2)

Divide (1) by (2):

g / g₁ = ((R + h) / R)²

g / g₁ = ( 1 + h / R)² = ( 1 + 160 / 6 370)² ≈ 1.026

g₁ = g / 1.026 = 9.8 / 1.026 ≈ 9.55 m/s²

Weight:

P =m·g₁ = 20·9.55 = 191 H

Answer:

D i think (apologies if incorrect)

Answer:

Yes

Explanation:

[tex]Consider\ three\ variables\ a,b\ and\ c.\\If,\\ab=ac\\a*b=a*c\\We\ may\ now\ divide\ the\ LHS\ and\ RHS\ by\ a,\\Hence,\\\frac{a*b}{a} =\frac{a*c}{a}\\Hence,\\b=c[/tex]

[tex]Ex: \\Consider\ a=5, b=6.\\Hence\ if,\\a*b=a*c\\5*6=5*c\\Hence,\\30=5c\\Hence, c=\frac{30}{5}\\c=6\\As\ b\ also\ equals\ to\ 6,\\b=c[/tex]

Answer:

D option

Explanation:

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Answer:

D. 0.5 km/s2

Explanation:

Answer:

10s

Explanation:

The time to get to the maximum would be the same as the time to get down to the maximum unless somehow gravity’s changes during the duration it goes up to and from maximum height.

Answer:

A) 6.5 m/s²

Explanation:

Mass of the bucket, m = 3.0 kg

depth of the well, d = 10 m

tension on the rope, T = 9.8 N

The net downward force on the bucket is given as;

T = mg - ma

where;

a is downward acceleration of the bucket

9.8 = (3 x 9.8) - 3a

9.8 = 29.4 - 3a

3a = 29.4 - 9.8

3a = 19.6

a = 19.6 / 3

a = 6.53 m/s² downwards

Therefore, the acceleration of the bucket is 6.53 m/s² downwards

Answer:

200 Newton

Explanation:

Weight is the force with which earth pulls the object.

W = M× g

where m is mass and g is acceleration due to gravity whose value is approximately 10 Newton

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Answer: because of friction it will stop rolling completly

Explanation:

Answer: The subjective perception of the frequency of sound is called a Pitch

Explanation: Because the Pitch has a lowest and highest  of a sound fundamental

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Answer:

m = mass [kg]

Explanation:

This equation is characteristic of the amount of motion and momentum.

[tex]F*t = m*(v_{f}-v_{i})[/tex]

where:

F = force [N] (units of Newtons)

t = time = [s]

m = mass [kg]

Vf = final velocity [m/s]

Vi = initial velocity [m/s]

Now using the units and placing them in the equation above.

[tex][N]*[s] = [kg]*(m/s-m/s)\\[/tex]

[tex][N]=[kg*m/s^{2} ][/tex]

Now replacing:

[tex][kg*m/s^{2}]*[s]=[kg*m/s][/tex]

The s² is cancelled with the s, therefore.

[tex][kg*m/s]=[kg*m/s][/tex]

Answer: All UV can have harmful effects on biological matter (such as causing cancers) with the highest energies causing the most damage.

Explanation:

Violet has the shortest wavelength and the lowest frequency.

When the entire spectrum of red visible light passes through a prism the wavelengths are separated into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength at about 380 nanometers and red has the longest wavelength at about 700 nanometers.

Visible light travels at 300,000 km/s and can be separated into 7 colors. From the longest wavelength, they are red, orange yellow green blue indigo, and violet. To clarify color is the eye's perception of different wavelengths of electromagnetic light. When it comes to visible light, the color with the highest frequency violet also has the highest energy. The lowest frequency of visible light red has the lowest energy.

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Answer:

The following components shall be used in given order:

1. Step Down Transformer     2. Diode as Rectifier     3. Capacitor

Explanation:

The following components shall be used in given order:

1. Step Down Transformer     2. Diode as Rectifier     3. Capacitor

1.STEP DOWN TRANSFORMER:

The step down transformer is first used to convert the 120 V AC signal into 12 V AC signal. Because the output required is of 12 V.

2.DIODE AS RECTIFIER:

Now, the PN Junction diode is used as a rectifier to convert the 12 V AC signal to 12 V  DC signal.

3.CAPACITOR:

Now, the output is in waveforms. So, in order to linearize it in the form of DC current, we use capacitor. The main function of capacitor is to smoothen the signal into a straight line.

Answer:

Question 4 is actually Acceleration

Answer:

A

Explanation:

18-28=10

10+10=20

20N to the right