Answer:
YES
Explanation:
An echo may be defined as a sound which is repeated because of the sound waves that are produced are reflected back after striking a surface. Sound waves can smoothly bounce off the hard objects in the same manner as a rubber ball bounces back the ground.
When a sound wave strikes a hard surface, the sound waves gets reflected back and bounces back to the observer and produces an echo. If the sound waves strikes a soft surface it absorbs the sound.
Although the direction of a sound changes but the echo sounds in the same way as the original sound.
Silicon is in fact a Metalloid. Comment if you need more info!
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Answer:
(a) 
(b) 
(c) 
Solution:
As per the question:
Mass of Earth, 
Mass of Moon, 
Mass of Sun, 
Distance between the earth and the moon, 
Distance between the earth and the sun, 
Distance between the sun and the moon, 
Now,
We know that the gravitational force between two bodies of mass m and m' separated by a distance 'r' is given y:
(1)
Now,
(a) The force exerted by the Sun on the Moon is given by eqn (1):
(b) The force exerted by the Earth on the Moon is given by eqn (1):
(c) The force exerted by the Sun on the Earth is given by eqn (1):
The answers to the problem are as follows:
<span>a) use f=ma. Mass of student is 836/9.8=85.3kg, force is 935-836=99N. Put it into the formula you will get a=99/85.3
b)Use same formula. Force is 782-836=-54 so put it into formula a=-54/85.3
c)Stopping would take longer as the acceleration is smaller
I hope my answer has come to your help. God bless and have a nice day ahead!</span>
