Answer: 330 m
Explanation:
The speed of sound 
is defined as the distance traveled by the sound wave 
in a especific time 
:
Where:
is the speed of sound
is half the time the sound wave travels since the person speaks, the sound wave hits the hill and then returns to the person again as an echo
is the distance between the person and the hill
So, we have to find :
Finally:
the force in each of the chains holding the trapeze bar is D. 330 N
Her weight has to be divided evenly so, divide 660/2= 330 N
Answer:
C. 100
D.3
E. 33.3
Explanation:
C. Mechanical Advantage=Load / Effort
= 200N
--------
100N
Therefore,. = 100
D. I. Velocity Ratio= distance moved by the effort / distance moved by load
= 30cm/10cm
= 3
II. Efficiency= M.A / V.R
= 100/3
= 33.33
Answer: 1. 0.19
2. 0.33
3. 0.47
4. 0.62
Explanation: just did it & these are the correct answers
