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S_A_V [24]
3 years ago
13

(11) The speed of radio waves is 300 000 000 m/s.

Physics
1 answer:
Neko [114]3 years ago
7 0

Answer:

Wavelength = 9.68 meters

Explanation:

Given the following data;

Speed = 300,000,000m/s

Frequency = 31 Megahertz to Hertz = 31 * 10⁶ Hz

To find the wavelength;

Wavelength = speed/frequency

Wavelength = 300,000,000/31,000,000

Wavelength = 9.68 meters

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sashaice [31]

Answer:

speed for last lap is 247.89 km/h

Explanation:

given data

velocity v1 = 203 km/h

velocity v2 = 199 km/h

no of lap n = 10

to find out

average speed for last lap

solution

we consider here distance d for 1 lap

so in first 9 lap time taken is

t1 = distance / velocity v2

t1 = 9d / 199    ...............1

and

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t2 = 10d / 203   .............2

so from 1 and 2 equation time for last lap

last lap time t3  = t2 - t1    

t3 = 10d / 203  -  9d / 199

t3 = 0.004034 d

so speed for last lap is

speed = distance / time

speed = d / 0.004034 d

speed = 247.89 km/h

so speed for last lap is 247.89 km/h

4 0
3 years ago
A car accelerates from rest to a velocity of 5 meters/second in 4 seconds. What is its average acceleration over this period of
wlad13 [49]
The car's average acceleration would be 1.25m/s^2 or 1.25meters/second/second. That looks to be the fourth one you've listed.
7 0
3 years ago
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An object of mass 4kg is moving along a horizontal plane. If the coefficient of kinetic friction is 0.2 find the friction force
lana66690 [7]

Answer:

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Explanation:

Given;

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F = 0.2 x 4 x 9.8

F = 7.84 N

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