‘velocity’ refers to how fast an object is moving ‘in a particular direction’. speed is only how fast something is moving and velocity is how fast something is moving AND the direction. (hope this helps)

6 0

3 years ago

Help!!!!!!!!!!!!!!!!!!

GREYUIT [131]

I think wind is anther answer

5 0

3 years ago

a plane inclined at an angle of 30° to the horizontal has an efficiency of 50%. the force parallel to the plane required to push

Nutka1998 [239]

Answer:

Correct Answer: Option B

Explanation

V.R = 1sinθ=1sin30=21sinθ=1sin30=2

M.A = E×V.R100=50×2100=1E×V.R100=50×2100=1

Effort = loadM.A=1201=120N

3 0

3 years ago

If light is used to promote the electron, what are the selection rules for the initial and final spin and orbital angular moment

loris [4]

Answer:

(1) $\Delta S=0$

(2) $\Delta L=0, +1,-1$ but $J=0 to J=0$ transition not allowed.

Explanation:

Atoms can be described by the quantum number n, spin quantum number S, angular momentum quantum number L, and total angular momentum quantum number J. Based on approximation Russel- Saunders electron coupling, the atomic term symbol can be written as $L_{J} ^{2S+1}$ .

The conditions or selection rule to promoting the electron are discussed below:

(1) The total spin should not change that is $\Delta S=0$ .

(2) The total angular momentum change should be, $\Delta L=0, +1,-1$ but $J=0 to J=0$ transition not allowed.

8 0

4 years ago