Imagine that you're standing in a large room when a loud noise is made.You begin hearing a series of echoes.Which charactestics
2 answers:
You might be interested in
Answer:
Explanation:
The apparent brightness follows an inverse square law, therefore we can write:
where I is the apparent brightness and r is the distance from the Sun.
We can also rewrite the law as
(1)
where in this problem, we have:
apparent brightness at a distance
, where
million km
We want to estimate the apparent brightness at , where
is ten times
, so
Re-arranging eq.(1), we find :
Answer:
Explanation:
Given
Car speed decreases at a constant rate from 64 mi/h to 30 mi/h
in 3 sec
we know acceleration is given by
negative indicates that it is stopping the car
Distance traveled
s=63.038 m
The correct answer is 2.8s
