Is this statement true or false?

Question 4 of 20

Nookie1986 [14]

Answer:

Which ball has the least momentum? C. A 160 g ball that is rolling north across a field at 2.0 m/s

xXxAnimexXx

5 0

3 years ago

Read 2 more answers

Consider two antennas separated by 9.00 m that radiate in phase at 120 MHz, as described in Exercise 35.3. A receiver placed 150

Dafna11 [192]

Answer:

a

$\Phi =4.524 \ rad$

b

$I = 0.40637 I_o$

Explanation:

From the question we are told that

The distance of separation is $d = 9.0 \ m$

The frequency is $f = 120 \ MHz = 120 *10^{6} \ Hz$

The distance of the receiver from the antennas is $D = 150 \ m$

The intensity measured is $I = I_o$

The change in position of the receiver is by $\Delta D = 1.8 \ m$

Gnerally the phase difference is mathematically represented as

$\Phi = \frac{ 2 \pi * \Delta D}{\lambda}$

Here $\lambda$ is the wavelength which is mathematically represented as

$\lambda = \frac{c}{f}$

Here c is the speed of light with value $c = 3.0 *10^{8} \ m/s$

=> $\lambda = \frac{3.0 *10^{8}}{ 120 *10^{6} }$

=> $\lambda = 2.5 \ m$

So

$\Phi = \frac{ 2* 3.142 * 1.8 }{2.5}$

$\Phi =4.524 \ rad$

Generally the intensity measured by the receiver is

$I = I_o cos^2 [\frac{\Phi}{2} ]$

=> $I = I_o [cos [\frac{4.524}{2} ]]^2$

=> $I = I_o [cos [ 2.262]]^2$

=> $I = 0.40637 I_o$

6 0

3 years ago

A sound wave traveling at STP has a period of .0023 seconds. The wavelength of this sound is closest to

agasfer [191]

Answer: 3

Wavelength = 0.76m

Explanation:

When sound wave is travelling at standard temperature and pressure ( STP), its speed will be equal to normal speed of sound which is equal to 331 m/s

Given that the period of the wave is 0.0023 seconds.

Wave speed = wavelength/period

Substitute the wave speed and the period to obtain wavelength

331 = wavelength/0.0023

Cross multiply

Wavelength = 331 × 0.0023

Wavelength = 0.7613 metre

The wavelength of this sound is closest to 0.76 m

4 0

4 years ago

Groundwater is desirable for which of the following reasons?

Akimi4 [234]

the answer is B. surface water can seep downward to become groundwater

5 0

3 years ago

What structure holds donor sperm in earthworms

lidiya [134]

Answer:

Explanation: As the earthworm passes through the slime tube, the tube will pass over the female pore picking up eggs. The tube will continue to move down the earthworm and pass over the male pore called the spermatheca which has the stored sperm called the spermatozoa.

4 0

3 years ago