Two astronauts are 1.40 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electr
1 answer:
Answer:
The spaceship is placed at a distance of meters from the Earth.
Explanation:
Distance between two astronauts, d = 1.4 m
The time it takes for sound waves to travel at 328 m/s through the air between the astronauts equals the time it takes for the electromagnetic waves to travel to the earth.
For sound, time taken is given by :
For electromagnetic wave, time taken to travel the Earth is :
d is the distance from the Earth to the spaceship.
As time are same :
So, the spaceship is placed at a distance of meters from the Earth.
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Answer:
a) -1.25 rev/s² and 23.3 rev
b) 2.67s
Explanation:
a) ω = (500 rev/min)(1min/ 60s) => 8.333 rev/s
ω= (200 rev/min)(1min/ 60s) => 3.333rev/s
time 't'= 4 s
angular acceleration 'α'=?
constant angular acceleration equation is given by,
ω= ω
+ α
t
α= (ω
- ω
)/t => (3.333-8.333)/4
α= -1.25 rev/s²
θ-θ = ω
t + 1/2α
t²
=(8.333)(4) + 1/2 (-1.25)(4)²
=23.3 rev
b) ω=0 (comes to rest)
ω = 3.333 rev/s
α= -1.25 rev/s²
ω= ω
+ α
t
t= (ω - ω
)/α
=> (0- 3.333)/-1.25
t= 2.67s
Answer:
total energy is 14.12kj
energy at 85% is 12kJ
Explanation:
