Which set of electromagnetic waves is in the correct order from greatest to least energy?

Se lanza desde el suelo verticalmente hacia arriba un objeto con una velocidad inicial de 20 m/s. Calcula: a)Posición y velocida

djverab [1.8K]

Answer:

Ver las respuestas a continuacion.

Explanation:

Para solucionar este tipo de problemas debemos de utilizar la siguiente ecuacion de la cinematica.

a)

$v_{f}=v_{o}-g*t$

Donde:

Vf = velocidad final [m/s]

Vo = velocidad inicial = 20 [m/s]

g = aceleración gravitacional = 9.81 [m/s²]

t = tiempo = 1 [s]

El signo negativo de la aceleración gravitacional significa que el objeto se mueve en dirección contraria a la aceleración gravitacional.

$v_{f}=20-9.81*(1)\\v_{f}=10.19[m/s]$

b)

La altura máxima se logra cuando la velocidad final es cero, es decir no existe movimiento alguno para que siga subiendo el objeto. Debemos utilizar la siguiente ecuación de la cinemática.

$v_{f}^{2} =v_{o}^{2}-2*g*y$

Donde:

y = elevación [m]

$0 = 20^{2} -2*9.81*y\\19.62*y=400\\y=20.38 [m]$

c)

Podemos calcular el tiempo máximo que toma el objeto en subir.

$v_{f}=v_{o}-g*t$

$0 = 20 -9.81*t\\9.81*t=20\\t=2.04[s]$

Ahora del numeral b) sabemos la distancia maxima, de esta manera y utilizando la siguiente ecuacion podemos calcular el tiempo de caida, Debemos tener en cuenta que ahora la velocidad final es igual a la velocidad inicial = 0.

$y=y_{o}+v_{o}*t+\frac{1}{2}*g*t^{2}$

$20.38 = 0*t + 0.5*9.81*t^{2} \\20.38 = 4.905*t^{2}\\t=\sqrt{\frac{20.38}{4.905} } \\t=2.04[s]$

Entonces el tiempo total es igual a:

t = 2.04 + 2.04

$t = 4.076 [s]$

4 0

3 years ago

A toroidal coil has a mean radius of 16 cm and a cross-sectional area of 0.25 cm2; it is wound uniformly with 1000 turns. A seco

Roman55 [17]

Answer:

Explanation:

Mutual inductance is equal to magnetic flux induced in the secondary coli due to unit current in the primary coil .

magnetic field in a torroid B = μ₀ n I , n is number of turns per unit length and I is current .

B = 4π x 10⁻⁷ x (1000 / 2π x .16 )x 1 ( current = 1 A)

flux in the secondary coil

= B x area of face of coil x no of turns of secondary

= 4π x 10⁻⁷ x (1000 /2π x .16 ) .25 x 10⁻⁴ x 750

= 2 x 1000 x .25 x( 750 /.16) x 10⁻¹¹

2343.75 x 10⁻⁸

= 23.43 x 0⁻⁶ H.

.

6 0

3 years ago

Read 2 more answers

An initially uncharged 3.47-μF capacitor and a 6.43-kΩ resistor are connected in series to a 1.50-V battery that has negligible

harkovskaia [24]

Answer: a) io=233.28 A ( initial current); b) τ=R*C= 22.31 ms; c) 81.7 ms

Explanation: In order to explain this problem we have to use, the formule for the variation of the current in a RC circuit:

I(t)=io*Exp(-t/τ)

and also we consider that io=V/R=(1.5/6.43*10^3)

=233.28 A

then the time constant for the RC circuit is τ=R*C=6.43*10^3*3.47*10^-6

=22.31 ms

Finally the time to reduce the current to 2.57% of its initial value is obtained from:

I(t)=io*Exp(-t/τ) for I(t)/io=0.0257=Exp(-t/τ) then

ln(0.0257)*τ =-t

t=-ln(0.0257)*τ=81.68 ms

3 0

3 years ago

You are thinking about adding a part-time job to your business? You could pay the employees the $6.50 per hour. How much would y

SCORPION-xisa [38]

Answer:

1.) 15hrs per week = $97.50

2.) 20hrs per week = $130

Explanation:

4 0

3 years ago

Choose the answer choice that BEST completes the following sentence. About four million tons of __________________ are converted

yaroslaw [1]

Answer:

About four million tons of matter are converted to energy in the Sun’s core every second

Explanation:

The Sun

It's estimated that The Sun fuses near 600 million tons $(6.10^9\ kg)$ of hydrogen into helium every second. As a result, 4 million tons of matter are converted to energy every second according to Einstein's equation $E=mc^2$

4 0

4 years ago