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Kamila [148]
3 years ago
15

A wave has a wavelength of 13 mm and a frequency of 18 hertz. What is its speed?

Physics
1 answer:
labwork [276]3 years ago
4 0
Velocity = Frequency x Wavelength

= 18 x 13 = 234 mm/s
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One way to measure g on another planet or moon by remote sensing is to measure how long it takes an object to fall a given dista
devlian [24]

Answer:

2.24 m/s²

Explanation:

Using equation of motion

s = ut + \frac{1}{2}at²

u = 0 , t = 3.17 s , s = 11.26 m

Put these values in the equation above

11.26 = 0 +.5 x a( 3.17)²

a = 2.24 ms⁻².

So acceleration due to gravity on that planet will be 2.24 m s⁻².

7 0
3 years ago
The speed is represented by
nordsb [41]

<u>Answer:</u>

<em>Instantaneous velocity is equal to speed of the object at that particular instant.</em>

<u>Explanation:</u>

Instantaneous velocity is the velocity of the object at that particular instant. It is also equal to speed of the object at that instant. It can be calculated by drawing a tangent to the position-time graph at that point and finding the tangent’s slope.

The first option ‘The ratio of change in position to the time interval during that change’  gives the average velocity of an object and not speed. Similarly the second option ‘the absolute value of the slope of position time graph’ gives the average speed.

3 0
3 years ago
Read 2 more answers
Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person’s voice w
abruzzese [7]

Answer:

3.85*10^8m

Explanation:

We know that

Speed v = distance/time t

So distance = v x t

So = 3*10^8 x 2.56s

= distatance = 7.7*10^8m

However this is double the distance from the earth to the moon, so to get distance from earth to the moon we divide by 2

7.7*10^8/2= 3.85*10^8m

8 0
3 years ago
What is the main source of energy
jolli1 [7]
Sun is the main source of energy
8 0
3 years ago
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Why does it take mars over 500 days to orbit the sun?
kakasveta [241]

Answer:

Mar's orbital path is more than that of Earth, thus it takes more number of days to orbit around the sun.

Explanation:

Mars takes over 500 days to orbit all the way around the sun than Earth because its distance from the sun (228 million kilometers) is greater than that of Earth (150 million kilometers) which takes it 365 days.

Planets that orbit closer to the sun take shorter time to orbit around the sun because the cover a shorter orbital distance and orbit faster than those planets further from the sun.

<u>For example</u>

Using Earth's distance from the sun, 150 million kilometers and the number of days taken to orbits the sun ,365 days and the distance Mars is from the Earth, 228 million kilometers, you can approximate the time Mar takes to orbit the sun as:

Earth 150 million kilometers  = 365 days

Mars  228 million kilometers= ?

Cross product ; (228 *365) /150 =555 -----(a value closer to that in the question)

6 0
3 years ago
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