Time taken for a message to sent from earth to reach the first astronauts is 140 second.
It takes about three days for a spacecraft to reach the Moon. in the course of that time a spacecraft travels at the least 240,000 miles 386,400 km that is the space between Earth and the Moon. The specific distance depends at the specific path selected.
The distance from earth to moon is approximately3.84*108m
So, the distance from earth to the astronauts is3.84*108m - 10500*103m =3.735*108m
The speed of light c = 2.99792458*108m/s
So, divided the distance from earth to astronauts by the speed off light,
3.735*108m/2.99792458*108m/s ˜1.25seconds
Divided the Pluto-earth distance by speed of light:
Hence, 4.2*1010m/2.99792458*108m/s = 140seconds
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Answer:
The steady-state theory was first proposed by Sir James Jeans in the 1920s, but it really got a boost in 1948 when it was reformulated by Fred Hoyle, Thomas Gold, and Hermann Bondi.
Explanation:
True
Answer:
When the spectral lines are absorption lines, the effect is called inverse Zeeman effect.
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Answer:
length of the ladder is 13.47 feet
base of wall to latter distance 6.10 feet
angle between ladder and the wall is 26.95°
Explanation:
given data
height h = 12 feet
angle 63°
to find out
length of the ladder ( L) and length of wall to ladder ( A) and angle between ladder and the wall
solution
we consider here angle between base of wall and floor is right angle
we apply here trigonometry rule that is
sin63 = h/L
put here value
L = 12 / sin63
L = 13.47
so length of the ladder is 13.47 feet
and
we can say
tan 63 = h / A
put here value
A = 12 / tan63
A = 6.10
so base of wall to latter distance 6.10 feet
and
we say here
tanθ = 6.10 / 12
θ = 26.95°
so angle between ladder and the wall is 26.95°
