The average distance between the earth and moon is 3.84x10^5km how far is this in miles

The time that would  take   a radio wave with the frequency of 7.25 x 10^5 Hz  to travel from  earth to the moon is    1.28  sec

Explanation:

Time =  distance / speed

distance =  3.84 x 10 ^5 km

convert  Km to m

1 Km= 1000 m

3.84 x10^5km= ? m

by cross multiplication

= (3.84 x 10^5 km x 1000 m) / 1 km = 3.84 x 10 ^8 m

Speed  of light=  3.0  x 10^8 m/s

therefore time =  3.84  x10^8 m / 3.0  x10^8 m/s =  1.28  sec

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s