Using Newton's law that F = ma.
The force here is the net force. The forces acting in opposite direction are the weight and the air resistance. The weight of course is acting downwards and the air resistance is pushing upwards.
Therefore:
W - AR = ma W = Weight = mg, AR = Air Resistance = 150.
g = 10 m/s2
mg - AR = ma
60(10) - 150 = 60a
600 - 150 = 60a
450 = 60a
60a = 450
a = 450/60
a = 7.5 m/s2
Cheers.
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Answer: Something that's vibrating, and you also need medium for those vibrations to start in.
I hope this helped!
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The force of the collisions creates pressure on the container. ... Explain why atmospheric pressure changes as depth changes. Atmospheric pressure increases as depth increases because at lower levels of the atmosphere, there is more air above that is being pulled down by gravitational force.
B. is coated on the inside with powder
The distance should be 11 cm and the image will be inverted (and smaller)
I used the Lens Equation:

Where:
obj. is the distance of the object
im. is the distance of the image
f is the focal length