**Answer:**

The rate of ladder moving down against the wall is 1.125 ft/s

**Explanation:**

<u>**Note: Refer to the attached figure**</u>

Applying the concept of the Pythagoras we have

or

9²+y² = 15²

⇒y² = 225 - 81

⇒y = √144 = 12 m

also,

differentiating with respect to time, we get

substituting the values in the above equation we get

or

or

or

here, the negative sign depicts that the value of y is decreasing or the ladder is moving down.

hence, the rate of ladder moving down against the wall is 1.125 ft/s

I believe its gravitational pull or unbalanced force.?

**Answer:**

**1.364 m**

**Explanation:**

We are given that

Frequency,f=110 MHz=

We have to find the distance between the nodal planes of the magnetic field.

We know that

Wavelength**,**

Where c=

Using the formula

Distance between nodal planes of the magnetic field

Answer:

Wavelength;λ = 0.0227 m

Explanation:

We are given that;

Velocity; v = 0.832 cm/s = 0.00832 m/s

f = 2.4 revs / 6.54 s = 0.367 hz

Now, wavelength is given by the formula;

Wavelength can be calculated using the following formula: wavelength = wave velocity/frequency.

Wavelength usually is expressed in units of meters. The symbol for wavelength is λ,

so λ = v/f

λ = 0.00832/0.367 = 0.0227 m

ANSWER:

- Transported by blood picked up in the alveoli

- Pumped to cells by ventricles

Hope this helps! :)