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4 years ago

Britain and France signed an entente and became the

Physics

2 answers:

V125BC [204]4 years ago

6 0

Allied Forces. they became the allies.

Shkiper50 [21]4 years ago

5 0

I think B. Allied forces

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There are usually _________ collisions in a motor vehicle crash.

mel-nik [20]

Answer:

Explanation:

During a crash 3 types of collisions can occur.

5 0

3 years ago

A portable CD player uses two 1.5 volt batteries. if the current in the CD player is 2amps ,what is resistance?

chubhunter [2.5K]

resistance=voltage/current

1.5/2=0.75ohms

7 0

3 years ago

The magnetic field in a plane monochromatic electromagnetic wave with wavelength λ = 598 nm, propagating in a vacuum in the z-di

Oksanka [162]

Answer:

For this given plane monochromatic electromagnetic wave with wavelength λ=598 nm, the wavenumber is $k=0,0105\ x\ 10^{-9}\ m^{-1}$ .

Explanation:

For a plane electromagnetic wave we have that the electrical and magnetic field are:

$E(r,t)=E_{0}\ cos ( wt-kr)\\\ B(r,t)=B_{0}\ cos(wt-kr)$

In this case we have the data for the magnetic field. We are told that the magnetic field in a plane electromagnetic wave with wavelength λ=598 nm, propagating in a vacuum in the z direction ( $\hat k$ ) is described by

$B=8.7\ x\ 10^{-6}\ T sin(kz-wt) (\hat i+\hat j)$

( $\hat i,\hat j, \hat k$ are the unit vectors in the x,y,z directions respectively)

The wavenumber k is a measure of the spatial frequency of the wave, is defined as the number of radians per unit distance:

$k=\frac{2\pi}{\lambda}$

where λ is the wavelength

So we get that

$k=\frac{2\pi}{\lambda} \rightarrow k=\frac{2\pi}{598 nm} \rightarrow k=0,0105\ x\ 10^{9}\ m^{-1}$

The wavenumber is

$k=0,0105\ x\ 10^{9}\ m^{-1}$ .

4 0

3 years ago

A car driving around a track is an example of projectile motion. a. True b. False

Degger [83]

the answer is.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................FALSE. You are welcome everybody :) GOod luck to all of you people. Peace love and coconut oil ॐ

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3 years ago

Read 2 more answers

In Hooke's law, Fspring=kΔx , what does the Fspring stand for?

Mrrafil [7]

Answer:

The amount of force acting on the spring.

Explanation:

Here, Fspring= kΔx is a equation denoting the amount of force acting on the spring.

where, k = spring constant.

Δx= change in the length of the spring.

so, for every Δx change in spring length, kΔx force acts on the spring.