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3 years ago

In the above lightwave the property labeled a determines which characteristic of visible light

Physics

1 answer:

kap26 [50]3 years ago

7 0

The light must be either very dim or else non-existent.
We can't see the light wave or the label.

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A piano mover raises a 1000-n piano at a constant speed using a very light rope in a frictionless pulley system, as shown in the

Rina8888 [55]

Here As we can see the figure that the end of the rope is pulled by some force F

Now as we can see that Piano is connected by a pulley which is passing over the pulley so effectively net force on the piano upwards will be 2F as it is connected by 2 ropes by the pulley

Now for constant velocity of the piano we will say

$2F - mg = ma$

since velocity is constant so acceleration must be ZERO

so here we have

$2F - mg = 0$

as we know here that

mg = 1000 N

so we will have

$2F - 1000 = 0$

$F = 500 N$

so here force must be 500 N

5 0

4 years ago

Read 2 more answers

Una barra metálica de 2 m de largo recibe una fuerza que lo provoca una alargamiento o variación en su longitud de 0.3 cm ¿Cuál

Elan Coil [88]

Answer:

La deformación unitaria lineal experimentada por la barra es $1.5\times 10^{-3}$ .

Explanation:

De la Mecánica de Materiales sabemos que la deformación unitaria lineal es la razón de la variación de la longitud con respecto a su longitud inicial. Al asumirse que la variación longitudinal es muy pequeña con respecto a la longitud inicial, se puede utilizar la siguiente ecuación:

$\epsilon = \frac{\Delta l}{l_{o}}$ (Eq. 1)

Donde:

$\epsilon$ - Deformación unitaria, adimensional.

$\Delta l$ - Cambio longitudinal, medido en metros.

$l_{o}$ - Longitud inicial, medida en metros.

Si conocemos que $\Delta l = 3\times 10^{-3}\,m$ y $l_{o} = 2\,m$ , entonces la deformación unitaria lineal es:

$\epsilon = \frac{3\times 10^{-3}\,m}{2\,m}$

$\epsilon = 1.5\times 10^{-3}$

La deformación unitaria lineal experimentada por la barra es $1.5\times 10^{-3}$ .

3 0

4 years ago

A wave has a frequency of 34 Hz and a wavelength of 2.0 m. What is the speed of the wave? Use . A. 17 m/s B. 36 m/s C. 0.059 m/s

mel-nik [20]

F= (speed)/(wavelength)

Therefore, speed = Frequency x wavelength
V = 68m/s

8 0

4 years ago

Read 2 more answers

A child's top is held in place upright on a frictionless surface. The axle has a radius of ????=3.21 mm . Two strings are wrappe

tekilochka [14]

Answer:

Angular momentum, $L=6.47\times 10^{-3}\ m$

Explanation:

It is given that,

Radius of the axle, $r=3.21\ mm=3.21\times 10^{-3}\ m$

Tension acting on the top, T = 3.15 N

Time taken by the string to unwind, t = 0.32 s

We know that the rate of change of angular momentum is equal to the torque acting on the torque. The relation is given by :

$\tau=\dfrac{dL}{dt}$

Torque acting on the top is given by :

$\tau=F\times r$

Here, F is the tension acting on it. Torque acting on the top is given by :

$\tau=2F\times r$

$2T\times r=\dfrac{L}{t}$

$L=2T\times r \times t$

$L=2\times 3.15\times 3.21\times 10^{-3}\times 0.32$

$L=6.47\times 10^{-3}\ m$

So, the angular momentum acquired by the top is $6.47\times 10^{-3}\ m$ . Hence, this is the required solution.

7 0

4 years ago

If a magnet is put inside one coil of wire a voltage is produced. What will happen if the magnet is put inside two coils of wire

atroni [7]

The choices can be found elsewhere and as follows:

A)There will not be a change.
B)The voltage will decrease by a factor of two. 
C)The voltage will increase by a factor of two. 
D)The two coils of wire will cancel out the magnetic field. 
E)The voltage will be zero.

I believe the answer is option C. If the magnet is put inside two coils of wire, then the voltage will increase by a factor of two. Hope this answers the question.

8 0

4 years ago