The seasons on earth are created by all of the following except:
c. mountain winds
Work done = fore × distance
wd= 47N ×o.25m
wd= 12.22Nm
Answer:
The speed is 13 m/s
Explanation:
In this problem, we have two reference frames:
- The reference frame of the observer on the ground, O
- The reference frame of the observes on the train, O', moving with velocity
with respect to O (here we have taken north as positive direction, so since the train is moving south, we wrote it as a negative number)
For the observer on the ground, O, Sydney is moving with velocity
(positive because it's moving north)
So, we can find Sydney's velocity with respect to the frame O' as follows
![v=v'+v_s\\v_s = v-v' = +8.0 - (-5.0) = +13 m/s](https://tex.z-dn.net/?f=v%3Dv%27%2Bv_s%5C%5Cv_s%20%3D%20v-v%27%20%3D%20%2B8.0%20-%20%28-5.0%29%20%3D%20%2B13%20m%2Fs)
So, the camera crew on the train observe Sydney moving at 13 m/s north
Answer:
astronauts age is 32 years
correct option is e 32 years
Explanation:
given data
travels = 20 light year
stay = 2 year
return = 52 years
to find out
astronauts aged
solution
we know here they stay 2 year so time taken in traveling is
time in traveling = ( 52 -2 ) = 50 year
so it mean 25 year in going and 25 years in return
and distance is given 20 light year
so speed will be
speed = distance / time
speed = 20 / 25 = 0.8 light year
so time is
time = ![\frac{t}{\sqrt{1-v^2} }](https://tex.z-dn.net/?f=%5Cfrac%7Bt%7D%7B%5Csqrt%7B1-v%5E2%7D%20%7D)
time = ![\frac{25}{\sqrt{1-0.8^2} }](https://tex.z-dn.net/?f=%5Cfrac%7B25%7D%7B%5Csqrt%7B1-0.8%5E2%7D%20%7D)
time = 15 year
so age is 15 + 2 + 15
so astronauts age is 32 years
so correct option is e 32 years