The correct answer is: [D]:
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"The amount of pressure exerted by a solid is solely dependent on its mass."
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Answer:
The 40g mass will be attached at 69 cm
Explanation:
First, make a sketch of the meterstick with the masses placed on it;
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↓ Δ ↓
20 g.................50 cm.................40g
38 cm y cm
Apply principle of moment;
sum of clockwise moment = sum of anticlockwise moment
40y = 20 (38)
40y = 760
y = 760 / 40
y = 19 cm
Therefore, the 40g mass will be attached at 50cm + 19cm = 69 cm
12cm 50 cm 69cm
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↓ Δ ↓
20 g.................50 cm.................40g
38 cm 19 cm
Answer:
1) The net force is 5 N. The box is accelerating 10 m/s
2) The net force is 6.986 N. It is accelerating. Normal Force is 16.986
Explanation:
1) 20 N forward - 15 N backwards = a net force of 5 N
Acceleration: Acceleration = Net Force * Mass ( derived from Force = mass * acceleration).
a = 5 N / 2 kg
a= 2.5 m/s^2
2)
Answer:
B
Explanation:
Electromagnetic spectrum includes visible light which we see all the time reflecting off objects to give them colours, mechanical waves like sound require something to move in, its the reason why people say you can't scream in space because space is a giant vacuum. No not the kind you use to clean up the mess you made from breakfast. The kind that has no air. So sound can be heard on earth as it is not a vacuum, air moves freely and transfers sounds vibrations all around you to be absorbed by walls and other stuff in comes in contact with.
Extra information:
Sound travels further in water because the molecules are closer together meaning that transferring the energy is easier. This is how Blue wales can communicate from hundreds of miles away.
The answer is A. conduction
