Two people stand a distance L apart along an east-west road. They both clap their hands at precisely noon in the ground frame. You are driving eastward down this road at speed 4c/5. You notice that you encounter the western person at the same instant (as measured in your frame) that the eastern person claps. Where are you along the road at the instant (as measured in your frame) that the western person claps?

Answer:

Velocity = 12 m/s

Explanation:

Given the following data;

Wavelength = 6 meters

Period = 0.5 seconds. This is due to the fact that the student is moving his hand up and down twice each second.

To find the velocity;

Velocity = wavelength * frequency

But, frequency = 1/period

Frequency = 1/0.5

Frequency = 2

Substituting the values into the velocity formula, we have;

Velocity = 6 * 2

Velocity = 12 m/s

Therefore, the velocity of the wave is 12 meters per seconds.

the work done done by that person is less than zero

Answer:

I'd go for 'Marie drives a car'

Explanation:

Static electricity will possible form in all the scenarios, but is more likely to form when you're driving a car. This is due to the friction between the body of the car and the particles in the air around the body of the car. This is why chains are sometimes attached to fuel tankers when transporting them. The chain is made to touch the ground so that any charge built up can be safely conducted to the earth, reducing the chances of a fire outbreak due to charges igniting the fuel.

Answer:

i think its a, sorry if im wrong

Explanation:

Explanation:

36. How long does it take a car to slow down from a speed of 54 km/h to 32 km/h over a distance of 65 m? Answer in seconds. 37.

Answer:

A)2.811 × 10^-12 F

B)4.09V

Explanation:

(a) What is the capacitance?

Capacitance of coaxial cylinder can be determined using below expresion

C= (2π ε0 L)/ Ln[ rb/ra]

Where

ε0= permittivity of free space= 8.85×10^−12 Fm^-1

L= length of each cylinder =13.0 cm= 13×10^-2m

rb= radius of outer cylinder= 7.20 mm= 7.20×10^-3m

ra=radius of inner cylinder=0.550 mm= 0.550×10^-3 m

If we substitute the values we have,

C= (2π ε0 L)/ Ln[ rb/ra]

C= ( 2 × π × 8.85×10^−12 ×13×10^-2) / Ln[

7.20×10^-3/0.550×10^-3]

C=( 7.2288×10^-12 )/2.5729

C=2.811 × 10^-12 F

B) (b) What applied potential difference is necessary to produce these charges on the cylinders?

Vba= Q/C

Where Vba=potential difference

Q= charge on each = 11.5 pC. = 11.5×10^-12

C= capacitance= 2.811 × 10^-12 F

If we substitute the values we have

Vba=(11.5×10^-12)/2.811 × 10^-12

= 4.09V

The energy present in pond water and kerosene are potential energy and chemical energy respectively.

Energy is a quantifiable quantity in physics that can be transferred from an item to do work. Thus, we might characterise energy as the capacity to engage in any kind of physical action. So, to put it simply, we can define energy as: Energy is the capacity to carry out work.

Energy "can neither be created nor destroyed but can only be changed from one form to another," according to the rules of conservation of energy. The SI unit for energy is called a joule.

In pond, water is stored during rain and stored potential energy whereas in kerosene, carbon molecules have chemical energy and when it burns, chemical energy revels as thermal energy.

Learn more about energy here:

https://brainly.com/question/1932868

#SPJ2

Answer:

[tex]24.81\ \text{rad/s}^2[/tex]

Explanation:

M = Mass of cylinder = 4.31 kg

R = Radius of cylinder = 0.294 m

m = Mass of bucket = 6.27 kg

g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]

[tex]\alpha[/tex] = Angular acceleration

a = Acceleration = [tex]\alpha R[/tex]

I = Moment of inertia of cylinder = [tex]\dfrac{MR^2}{2}[/tex]

The force balance of the system is

[tex]mg-T=ma\\\Rightarrow T=m(g-a)[/tex]

For the disk

[tex]TR=I\alpha\\\Rightarrow m(g-a)R=\dfrac{1}{2}MR^2\alpha\\\Rightarrow \alpha=\dfrac{g}{\dfrac{MR}{2m}+R}\\\Rightarrow \alpha=\dfrac{9.8}{\dfrac{4.31\times 0.294}{2\times 6.27}+0.294}\\\Rightarrow \alpha=24.81\ \text{rad/s}^2[/tex]

The angular acceleration of the pulley is [tex]24.81\ \text{rad/s}^2[/tex].

Answer:

I = 2A

Explanation:

V = IR

10V = I × 5ohms

I = 2A

Answer:

2Ampere

Explanation:

V=IR (ohm's law) so I =[tex]\frac{V}{R}[/tex] =[tex]\frac{10}{5}[/tex]=2Ampere

Answer:

R = 19.36  ohms

Explanation:

Given that,

The power of an electric motor, P = 2500 Watts

The voltage of the circuit, V = 220 V

We need to find the resistance of the motor. We can find it as follows :

[tex]P=\dfrac{V^2}{R}\\\\R=\dfrac{V^2}{P}\\\\R=\dfrac{(220)^2}{2500}\\R=19.36\ \Omega[/tex]

So, the resistance of the motor is 19.36  ohms.

Answer:

20

Explanation:

→ First perform calculation within brackets

2 × 5 = 10

→ Resubstitute back

2 × 10

→ Solve

20

Answer:

a

Explanation:

Answer:

b

Explanation:

Answer:

This is your answer. If I'm right so,

Please mark me as brainliest. thanks!!

Answer:

A simple circuit definition is a closed loop of a conductor that electrons can travel around, usually consisting of a power source (a battery, for example) and an electrical component or device (like a resistor or a light bulb) and conducting wire.

Answer:

Newton

Explanation:

Newton's are the standard unit of force.

Answer:

c. Bullfrogs

Explanation:

I did this lesson and got it right! :)

Answer:

direction : West to East

magnitude : 6.0 * 10^-3

Explanation:

Given data :

Four ( 4 ) monitoring wells

location of wells = corners of 1-ha square

Total piezometric head in each well ;

NE corner = 30.0 m ;

SE corner = 30.0 m;

SW corner = 30.6 m;

NW corner = 30.6 m.

Calculate for  the magnitude and direction of the hydraulic gradient

first step ; calculate for area

Area = ( 1 -ha  ) ( 10^4 m^2/ha )

        = 1 * 10^4 m^2

Distance between the wells = length of side

      = √( 1 * 10^4 ) m^2

      = 100 m

Direction of Hydraulic gradient is from west to east because the total piezometric head in the west = Total piezometric head in the east

Next determine The magnitude of the hydraulic gradient

= ( 30.6 - 30 ) / 100

= 6.0 * 10^-3

Answer:

A temporary charge

Explanation:

Static electricity is not steady. Unlike current electricity, it does not have a  driving force either in the form of a voltage source or an electromotive force from a cell or a generator. Static electricity is usually due a temporary flow of charges between bodies due unbalanced charges within a system, continuing  until equilibrium is achieved.

Answer:

a is correct

Explanation:

Answer:

Difference between heat and temperature in tabular form

Heat vs Temperature

1.Heat is a form of energy that can transfer from a hot body to a cold body. and Temperature is the degree of hotness and coldness of a body.

2.Heat is the total kinetic energy and potential energy obtained by molecules in an object. and Temperature is the average K.E of molecules in a substance.

3.Heat flows from hot body to cold body. It rises when heated and falls down when an object is cooled down and It has a working ability. It does not have the working ability

.

4.Its SI unit is “Joule” and Its SI unit is “Kelvin”.

5.It is measured by the calorimeter and It is measured by the thermometer

.

6.It is represented by “Q”. and It is represented by “T”.

Explanation:

A calorimeter is an object used for calorimetry, or the process of measuring the heat of chemical reactions or physical changes as well as heat capacity. ... A simple calorimeter just consists of a thermometer attached to a metal container full of water suspended above a combustion chamber.

Answer:

1306.66N

Explanation:

Given data

r=12.0 m

v=14 m/s

m= 80kg

From the formula

F= mv^2/r

substitute

F= 80*14^2/12

F= 80*196/ 12

F= 15680/12

F=1306.66N

Hence the force applied is 1306.66N

Answer:

a) θ = 1.67 10⁻⁵ m,  b) Consequently we must affirm that the vehicle headlights cannot resolve.

Explanation:

a) To find the resolution of the camera we use the Rayleigh criterion for diffraction

            a sin θ = m λ

where m = 1 for the first zero of the slit

we must remember that the angles in the experiments are measured in radians and are very small

            sin θ = θ

we substitute

             θ = [tex]\frac{\lambda}{a}[/tex]

this expression is for a slit, in the case of circular openings the expression must be solved in polar coordinates giving

             θ = [tex]1.22 \ \frac{\lambda}{D}[/tex]

where D diameters of the opening

let's calculate

            θ = [tex]1.22 \ \frac{550 \ 10^{-9}}{ 40\ 10^{-3}}[/tex]

           θ = 1.67 10⁻⁵ m

b) let's use trigonometry to find the separation distance on earth

            tan θ = y / x

            y = x tan θ

let's calculate

remember that the angles must be in radians

                y = 250 10³ tan 1.67 10⁻0-5

                y = 4.18 m

as they indicate that the separation of the headlights is y = 1.6m,

we see that this separation is greater than the separation distance separation.

Consequently we must affirm that the vehicle headlights cannot resolve.

Answer:

R = 46,25 (Ω)

L = 0,07363 (H)

C = 2,7 *10⁻⁶ (F)

Explanation:

Statement problem does not specify if  160 (V) is peak voltage or RMS value. If 160 (V) is the peak value then for a sinusoidal wave,  RMS value is  V(rms) = 160 /√3

V(rms) =  92,49 (V)

In each branch: we have

V = I*Z         V = voltage through the impedance in (V) , I current in (A)

and Z impedance in Ω

Resistor case    Z = R  then V = 92,49 = 2 * R

R = 92,49/2       R = 46,25 (Ω)

Inductor case   |Z| = wL    Then Z = 2*π*f*L   V = 0,8 * |wl|

Inductor L in (H)       |wL| * 0,8 = 92,49   |wL| = 92,5/0,8    w = 2*π*f   2*3,14*250= 1570

1570*L = 92,49/0,8

L = 0,07363 (H)

In the case of the capacitor

|Z|  = 1/wc    = 1/1570*c

The current is 2 + 0,8 = 2,8          2,8 - 2,5 = 0,3 (A)

Again  V = I*Z        92,49 = 0,3 /1570*C

C = 0,3 / 1570*92,49

C = 2,7 *10⁻⁶ (F)

Answer:

a) quantity to be measured is the height to which the body rises

b) weighing the body , rule or fixed tape measure

c)   Em₁ = m g h

d) deformation of the body or it is transformed into heat during the crash

Explanation:

In this exercise of falling and rebounding a body, we must know the speed of the body when it reaches the ground, which can be calculated using the conservation of energy, since the height where it was released is known.

a) What quantities must you know to calculate the energy after the bounce?

The quantity to be measured is the height to which the body rises, we assume negligible air resistance.

So let's use the conservation of energy

starting point. Soil

          Em₀ = K = ½ m v²

final point. Higher

          Em_f = U = mg h

         Em₀ = Em_f

         Em₀ = m g h₀

b) to have the measurements, we begin by weighing the body and calculating its mass, the height was measured with a rule or fixed tape measure and seeing how far the body rises.

c) We use conservation of energy

starting point. Soil

          Em₁ = K = ½ m v²

final point. Higher

          Em_f = U = mg h

         Em₁ = Em_f

         Em₁ = m g h

d) to determine if the energy is conserved, the arrival energy and the output energy must be compared.

There are two possibilities.

* that have been equal therefore energy is conserved

* that have been different (most likely) therefore the energy of the rebound is less than the initial energy, it cannot be stored in the possible deformation of the body or it is transformed into heat during the crash

Answer:

Hey mate.....

Explanation:

This is ur answer....

3% of the earth's water is fresh. 2.5% of the earth's fresh water is unavailable: locked up in glaciers, polar ice caps, atmosphere, and soil; highly polluted; or lies too far under the earth's surface to be extracted at an affordable cost. 0.5% of the earth's water is available fresh water....

Hope it helps you,

Mark me brainliest plz....

Follow me! :D

Question:

1. Only about % of water on Earth is fresh water that is readily available for human consumption.

a. less than 1

b. 5

c. more than 50

d. All water on Earth is fresh water and is easily accessible

Answer:

a. less than 1

Answer:

the glasses received 0.1131 of the total intensity

Explanation:

Given the data in the question;

the intensity is proportional to the electric field amplitude;

now, we assign the electric field of 1 to the vertical component and an electric field of 2.8 to the horizontal component

so;

Horizontal intensity =  1² = 1

Vertical intensity = 2.8² = 7.84

so total intensity = 1 + 7.84 = 8.84

fraction of the light intensity received before the glasses were put on now reaches the sunbather's eyes,

since the sunglasses blocks the horizontal intensity so only the the vertical intensity goes through;

hence

⇒ 1 / 8.84 = 0.1131 of the total intensity

Therefore, the glasses received 0.1131 of the total intensity

Answer:

Yes

Explanation:

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