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Nostrana [21]
3 years ago
10

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. 
<span>B)The voltage will decrease by a factor of two. </span>
<span>C)The voltage will increase by a factor of two. </span>
<span>D)The two coils of wire will cancel out the magnetic field. </span>
<span>E)The voltage will be zero.
</span>
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
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