**Explanation:**

If it doesn't specify vertical or horizontal, that means it wants you to find the total velocity. You can do that using Pythagorean theorem:

v² = vₓ² + vᵧ²

The wavelength of the first order bright band light light is **714 nm .**

**Explanation:**

We have to find the wavelength of the first order brightness of a light. Here we are using** Huygen's principle **of light.

The formula is

nλ =d sinθ

where, n is the order of maximum

λ is the wavelength of light

d is the distance between the lines on diffraction grating.

θ is the angle.

For the given equation n is 1 because the problem states that the light forms 1st order bright band

λ is unknown.

d = or 0.0000014 m

sin (30) = 0.5

so,

1(λ) = (0.0000014)(0.5)

= 0.0000000714

= **714 nm**

Thus, The wavelength of the first order bright band light light is **714 nm .**

**Answer:**

and

**Explanation:**

**The first sentence of this question is not explanatory enough. However, I'll assume the force to be 15N**

to the horizontal

**Required**

Solve for the x and y components

**Since the given angle is to the horizontal, the x and y coordinates are calculated using the following illustrations.**

---- y component

---- x component

**Calculating the y component.**

**Substitute 15 for Force and 36.7 for **

becomes

**Make y the subject**

**Calculating the x component.**

**Substitute 15 for Force and 36.7 for **

becomes

**Make y the subject**

<em>**Hence, the x and y components of the force are: 8.964N and 12.027N respectively.**</em>

Hot water boils faster since its already hot and dosnt take much more time to get as hot

Base on my research, within 2 hours you have a number of atoms which remain.

N= N0*2^(-t/6.020 = N= N0*2^-0.33223= 07943 N0

So, the number of atoms that are being disintegrated is N0-N=N0*(1-0.79430)=0.2057 N0

It must be equal to 15 mCi = 15*3.7*10^7= 5.55*10^8 atoms

N0= 5.55*10*8/0.2057 = 2.698*10^9 atoms

Therefore, 2.698*10^9 atoms is the number of N0