Someone please help me figure this out

Answer:

D. lucid dreaming

Explanation:

(=^w^=)

Answer:

1.47 s

Explanation:

From the question,

s = 2d/t................... Equation 1

s = speed of sound in air, d = distance between the boy and the hill, t = time to hear the echo.

make t the subject of the equation

t = 2d/s............... Equation 2

Given: d = 250 meters

Constant: s = 340 m/s

Substitute these values into equation 2

t = (2×250)/340

t = 500/340

t = 1.47 s

Answer:

[tex]E = 2.9775\times10^5 J[/tex]

Explanation:

Given:  The latent heat of fusion for Aluminum is [tex]L = 3.97\times10^5 J/Kg[/tex]

mass to be malted m = 0.75 Kg

Energy require to melt E = mL

[tex]E = 3.97\times10^5\times0.75 = 2.9775\times10^5 J[/tex]

Therefore, energy required to melt 0.75 Kg aluminum

[tex]E = 2.9775\times10^5 J[/tex]

Answer:

The Coriolis Effect, in combination with an area of high pressure, causes the prevailing winds—the trade winds—to move from east to west on both sides of the equator across this 60-degree "belt."

Explanation:

if its wrong welp sorry that what i know,

C. Light rays are bent by the water in the glass.

Explanation:

The light defracts as is it leaves the medium of air and enters the medium of the water/glass.

The link below is to a short video that explains this concept very well.

https://youtu.be/Iq1a_KJTWJ8

Answer:

Average acceleration of the car is 1.167 m/s^2

Explanation:

The speed of car with which it is travelling is 12 m/s

As the driver accelerates the car, the speed reaches 26 m/s

The change in speed in 12 seconds is

26 -12 = 14 m/s

Average acceleration is change in speed divided by time

[tex]\frac{14}{12} \\1.167[/tex] m/s^2

Answer: No sure what to do

Explanation: points for points

Answer:

[tex]\lambda=3\ m[/tex]

Explanation:

Given that,

The horizontal distance between the two nodes is 1.5 meters.

We need to find the wavelength of the standing wave.

If we know the distance between nodes and antinodes, then the equation is :

[tex]\dfrac{\lambda}{2}=D[/tex]

Where

[tex]\lambda[/tex] is the wavelength

So,

[tex]\lambda=2D\\\\=2\times 1.5\\\\=3\ m[/tex]

So, the wavelength of the standing wave is equal to 3 m.

Answer:

A                                    

Explanation:

Answer : a. Extrusion

Answer:

the answer is C gravity

Explanation:

Answer:

160J OR 140J

Explanation:

Depends on teacher which formula your teacher uses.

U=Q+W OR U=Q-W

Method 1:

U=150+10J=160

U=150-10=140J

Answer:

The motion of the book would change if there was less friction if it moved across the table is that it would spin and have more kenetic energy.

Explanation:

friction slows stuff down so if it had less friction it would speed up and spin when sliding.

Answer:

It follows that the magnitude in radians of one complete revolution (360 degrees) is the length of the entire circumference divided by the radius, or 2πr / r, or 2π. Thus 2π radians is equal to 360 degrees, meaning that one radian is equal to 180/π ≈ 57.295779513082320876 degrees.

Explanation:

Answer:

D. Friction

Explanation:

"Friction is caused by microwelds that form between two surfaces. Microwelds are stronger when the two surfaces are pushed together with a greater force." - ( Module 3 • Forces and Newton’s Laws) quoted

hope this helps and is right. p.s. i really need brainliest :)

Answer:

Friction

Explanation:

Took The Test

Answer:

[tex]Q=-38.15kJ[/tex]

Explanation:

From the question we are told that

Piston-cylinder initial Volume of air [tex]v_1=0.1 m^3[/tex]

Piston-cylinder initial temperature [tex]T_1=400k[/tex]

Piston-cylinder initial pressure [tex]P_1= 100kpa[/tex]

Supply line temperature[tex]T_s=400k[/tex]

Supply line pressure [tex]P_s= 500kpa[/tex]

Valve  final pressure [tex]P_v=500kpa[/tex]

Piston movement pressure [tex]P_m=200kpa[/tex]

Piston-cylinder final Volume of air[tex]v_2=0.2 m^3[/tex]

Piston-cylinder final temperature [tex]T_2=440k[/tex]

Piston-cylinder final pressure [tex]P_2= 500kpa[/tex]

Generally the  equation for conservation of mass is mathematically given by

[tex]Q=m_2 \mu_2-m_1 \mu_1 +W-(m_2-m_1)h[/tex]

where

Initial moment

[tex]m_1=\frac{p_1 V_1}{RT_1}[/tex]

[tex]m_1=\frac{100*0.1}{0.287*400}[/tex]

[tex]m_1=8.7*10^-^2kg[/tex]

Final moment

[tex]m_2=\frac{p_2 V_2}{RT_2}[/tex]

[tex]m_1=\frac{500*0.3}{0.287*440}[/tex]

[tex]m_1=79*10^{-2}kg[/tex]

Work done by Piston movement pressure

[tex]W=Pd[/tex]

[tex]W=P(v_2-v_1)[/tex]

[tex]W=200(0.2-0.1))[/tex]

[tex]W=20000J[/tex]

Heat function

[tex]h=cT_1[/tex]

[tex]h=1.005(400)[/tex]

[tex]h=402[/tex]

Therefore

[tex]Q=(0.792*0.718(440)-0.0871*0.718(400)+20-(0.792-0.087)*402))[/tex]

[tex]Q=-38.15kJ[/tex]

It is given mathematically that the system lost  or dissipated Heat of

[tex]Q=-38.15kJ[/tex]

Answer:

La densidad del tetracloruro de carbono es 1.990 gramos por centímetro cúbico.

Explanation:

La masa de agua contenida dentro de la botella es igual a la diferencia entre la masa pesada totalmente llena y la masa pesada totalmente vacía, es decir:

[tex]m_{w} = 86.55\,g-24.25\,g[/tex]

[tex]m_{w} = 62.3\,g[/tex]

Ahora, de acuerdo con la definición de densidad, la masa es directamente proporcional a la densidad, entonces, podemos calcular la densidad del solvente mediante la siguiente relación:

[tex]\frac{m_{x}}{m_{w}} = \frac{\rho_{x}}{\rho_{w}}[/tex] (1)

Donde:

[tex]m_{x}[/tex] - Masa del tetracloruro de carbono, en gramos.

[tex]m_{w}[/tex] - Masa del agua, en gramos.

[tex]\rho_{x}[/tex] - Densidad del tetracloruro de carbono, en gramos por centímetro cúbico.

[tex]\rho_{w}[/tex] - Densidad del agua, en gramos por centímetro cúbico.

Si sabemos que [tex]m_{x} = 123.95\,g[/tex], [tex]m_{w} = 62.3\,g[/tex] y [tex]\rho_{w} = 1\,\frac{g}{cm^{3}}[/tex], entonces la densidad del tetracloruro de carbono es:

[tex]\rho_{x} = \left(\frac{m_{x}}{m_{w}} \right)\cdot \rho_{w}[/tex]

[tex]\rho_{x} = 1.990\,\frac{g}{cm^{3}}[/tex]

La densidad del tetracloruro de carbono es 1.990 gramos por centímetro cúbico.

Answer:

300N

Explanation:

F=m×a

F=30kg×10m/s^2

F=300N

If 30 kilograms sit on a table the acceleration due to gravity is 10 meters/second², then the force exerted by the table on the television would be 300 Newtons,

Therefore the correct answer is option C.

The rate of change of the velocity with respect to time is known as the acceleration of the object.

As given in the problem If 30 kilograms sit on a table the acceleration due to gravity is 10 meters/second²,

the force exerted = mass × acceleration due to gravity

                       = 30 kilograms ×  10 meters/second²

                       = 300 Newtons

Thus, the force exerted by the table on the television would be 300 Newtons,

To learn more about acceleration from here, refer to the link;

brainly.com/question/2303856

#SPJ2

Answer:

some symptoms can be lack of energy, and dizziness.

Explanation:

Answer:

Mercury

Essentially because Mercury is closest to the Sun, when taking an average over time, Mercury is the closest planet to the Earth, and - in that measure - it is the closest planet to each of the other planets in the Solar System.

Explanation:

Answer:Electricity works by getting a bunch of conductor elements together and creating a flow of electron-stealing patterns through them. This flow is called a current. ... Once you can control the direction the electrons are going, you can use them to power or charge anything from a light bulb to your TV to your electric car.

Explanation:trust

Answer: They create antibodies.

Answer:

1, 2 and 3

Explanation:

The most dense substance will settle at the bottom of the cup

Answer:

c

Explanation:

Answer:

Areas where earth crust experiences a high amount of stress

Explanation:

FCAT review question

Answer:

D. Pearl Harbor

Explanation:

Answer:

C

Explanation:

Vector A points up

Vector B points right

The combination must be both up and right which is C

Answer:

A) El desplazamiento total del viaje es 14160 centímetros.

B) La velocidad media del viaje completo es 885 centímetros por segundo.

Explanation:

A) El desplazamiento es el producto de la velocidad media por el tiempo. El desplazamiento total es la suma de desplazamientos asociados a cada velocidad media, entonces:

[tex]x = \left(1200\,\frac{cm}{s}\right)\cdot (9\,s)+ \left(480\,\frac{cm}{s} \right)\cdot (7\,s)[/tex]

[tex]x = 14160\,cm[/tex]

El desplazamiento total del viaje es 14160 centímetros.

B) La velocidad media del viaje es el desplazamiento total dividido por el tiempo total, es decir:

[tex]\bar v = \frac{14160\,cm }{16\,s}[/tex]

[tex]\bar v = 885\,\frac{cm}{s}[/tex]

La velocidad media del viaje completo es 885 centímetros por segundo.

Answer:

Explanation:

In this case, a dark shirt or blanket would be a heat conductor as well as metal would be, too