Answer
given,
radius of earth = 6370 km
earths latitude = 55° N
time = 24 hour = 86400 s
angular speed = ω
a) 
b) 
c) ω at equator
d)
Answer:
4 m/s.
Explanation:
The following data were obtained from the question:
Distance travalled (d) = 20 m
Time (t) = 5 secs
Speed (S) =?
Speed is defined as the rate of change of distance moved with time. Mathematically, it is expressed as:
Speed (S) = Distance (d) /time (t)
S = d/t
With the above formula, we can easily calculate the speed of the individual as follow:
Distance travalled (d) = 20 m
Time (t) = 5 secs
Speed (S) =?
S = d/t
S = 20/5
S = 4 m/s
Therefore, the speed of the individual is 4 m/s
74 km. Displacement is the distance between the two points not the distance traveled so 244 - 170 is 74 km
Answer:
3.75s
Explanation:
Using equation of motion, t= (v-u)/a
where v=0, u=75 and a=-20
t=-75/-20=75/20=3 /.75
Is a physical change because only the state of the matter has changed.
Physical changes can often be reversed. Allowing the water to evaporate will return the salt to a solid state.
It has not combined with the water to cause an irreversible chemical reaction.
