Answer:
Kindly check explanation
Explanation:
Given the following :
Distance between Ranjan and Gomez house = 9km
Start time = 6'o clock
Time he arrived at Gomes house = 7'o clock
Time used for chatting during this period = 5 minutes
Distance covered in 40minutes = 6km
Time spend for second part of the journey = (60 - (40 + 5))minutes = 15 minutes = 15/60 = 0.25 hoir
Distance covered during second part of journey = 9 - 6 = 3 km
Speed = distance / time
Speed = 3km / 0.25 hr = 12km/hr
Average speed for entire journey :
First part :
Speed = distance / time
Time = 40 minutes = (40/60) = 0.667 hour
Speed = 6km / 0.667 hour = 9km / hr
Average speed :
(First part + second part) / 2
(9km/hr + 12km/hr) / 2 = 21km/hr / 2 = 10.5 km/hr
= 10.5km/hr
Let's convert first the wavelength into meters:
Then, we know that the wavelength is related to the frequency by the following equation:
Where
is the speed of light in free space. Therefore, putting in the numbers, we find the frequency f:
using the formula
F = ma
Where F is the force applied by the machine
A is the acceleration which is also equal to v/t
where v is the velocity and t is time
M is the mass
F = mv/t
F = (0.15kg) (30 – 0 m/s)/ 0.5 s
<span>F = 9 N</span>
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