Compared to red light, blue light has higher frequency and

Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 × 108 m. Find th

Veseljchak [2.6K]

Answer:

a) Find the time it took for his voice to reach the earth via radio waves.

1.28s

b) Determine the minimum time that will be required for a message from Mars to reach the earth via radio waves.

186.6s

Explanation:

The electromagnetic spectrum is the distribution of radiation due to the different frequencies at which it radiates and its different intensities. That radiation is formed by electromagnetic waves, which are transverse waves formed by an electric field and a magnetic field perpendicular to it.

The distribution of the radiation in the electromagnetic spectrum is given in frequency, in the following order from the highest to the lower frequencies:

X-rays

Ultraviolet rays

Visible region

Infrared

Microwave

Radio waves

Light propagates as electromagnetic wave in vacuum with a speed of $3x10^{8}m/s$ . Therefore, radio waves will have the same speed in vacuum.

a) Find the time it took for his voice to reach the earth via radio waves.

Then, to know the time that it took for Neil A. Armstrong's voice to reach the Earth via radio waves from the Moon, the next equation can be used:

$c = \frac{d}{t}$ (1)

Where v is the speed of light, d is the distance and t is the time.

Notice that t can be isolated from equation 1.

$t = \frac{d}{c}$ (2)

$t = \frac{3.85x10^{8} m}{3x10^{8}m/s}$

$t = 1.28s$

Hence, it took 1.28 seconds for his voice to reach the Earth via radio waves from the Moon.

(b) Determine the minimum time that will be required for a message from Mars to reach the earth via radio waves.

For this part, the same approach described above will be used.

For this case, $d = 5.60x10^{10}m$

$t = \frac{d}{c}$

$t = \frac{5.60x10^{10}m}{3x10^{8}m/s}$

$t = 186.6s$

Hence, the minimum time that will be required for a message from Mars to reach the earth via radio waves is 186.6 seconds.

6 0

4 years ago

After initially picking the stone up off the ground, a man exerts a 148 N force upwards on a 10 kg stone. What is the accelerati

Lubov Fominskaja [6]

Answer:

5m/s²

Explanation:

The force exerted on an object is calculated using the formula ;

F = ma

Note that the upward force (F) is 148N

Where;

F = force (N)

m = mass (kg)

a = acceleration (m/s²)

The downward force towards gravity is F' = mg

F' = 10 × 9.8m/s²

F' = 98N

Net force (F - F') = m × a

148 - 98 = 10 × a

50 = 10a

a = 50/10

a = 5m/s²

4 0

3 years ago

Uniform solid disk rolls without slipping down a 19.0° inclined plane. what is the acceleration of the disk's center of mass?

coldgirl [10]

Below is the solution:

Let us say that the disk goes through a vertical elevation change of one meter.

The change in potential energy will equal the change in kinetic energy 

PE = KEt + KEr 
mgh = ½mv² + ½Iω² 

for a uniform disk, the moment of inertia is 
I = ½mr² 
and 
ω = v/r 

mgh = ½mv² + ½(½mr²)(v/r)² 
mgh = ½mv² + ¼mv² 
gh = ¾v² 

v² = 4gh/3 

v² = u² + 2as 

if we assume initial velocity is zero 

v² = 2as 
a = v² / 2s 

s(sinθ) = h 
s = h/sinθ 

a = 4gh/3 / 2(h/sinθ) 
a = ⅔gsinθ 

a = ⅔(9.8)sin25 
a = 2.8 m/s²

3 0

4 years ago

Which are negative impact that the internal combustion engine has had on society

OverLord2011 [107]

The internal combustion engine has been criticized for ages for its negative effects on human health as well as the deterioration that it has caused to the environment with the release of Carbon Dioxide (CO2). However, to settle the skeptics, studies have been conducted to prove the environmental benefits of the internal combustion engine.

According to an article written by Dr. Dwight R. Lee, an Economist at the University of Georgia, livestock is responsible for 18% of the greenhouse gases that cause global warming, a far higher statistic than the contribution made by automobiles and aircrafts. The internal combustion engine began replacing horses as a source of power in the early 1900s, which started replacing the outputs from animals with exhaust from tailpipes.

7 0

3 years ago

Read 2 more answers

What are the advantages of vacuum diode ?

sweet-ann [11.9K]

Answer:

An electron tube from which all air has been removed. The vacuum ensures transparency inside the tube for electric fields and moving electrons. Most electron tubes are vacuum tubes; cathode-ray tubes, which include television picture tubes and other video display tubes, are the most widely used vacuum tubes

Explanation:

hope it help

4 0

3 years ago