Answer:
1-D(carbon dioxide, water and sunlight)
2-D(parasitism)
3-C(competition)
Explanation:
hope it helps
Answer:
a).
b).rpm
c).v=0.5865 m/sec.
Explanation:
Given:
a).
The angular speed in radians per seconds is
b).
rpm
c)
Child's distance per revolution
(pi*2r) = 43.988 metres.
v=(43.988 x 0.0133333) = 0.5865 m/sec.
To solve this problem it is necessary to apply the concepts related to the law of Malus.
The light intensity after passing through the first polarizer is given as
Where,
I = Intensity of unpolarized light
The expression for malus law is given as
Where
\theta = Angle between the first and second polarizers
= Intensities of the light after passing through the first and second polarizers respectively.
The intensity of light after passing first polarizer ( Perpendicular to the surface) is
The angle between the first and second polarizers is given by
The expression for Malus law is given by
Therefore the intensity of the light after passing through both the polarizer is
Answer:
b.The frictional force and force exerted by the spring scale on the block, because they are a Newton's third-law pair.
Explanation:
Students connect a spring scale to a block on a rough horizontal surface. The students use the spring scale to measure the magnitude of the horizontal force needed to pull the block at a constant speed. Which of the following statements explains why two forces exerted between objects ar equal in magnitude?
a.A The gravitational and normal forces exerted on the block, because they are a Newton's third-law pair.
b.The frictional force and force exerted by the spring scale on the block, because they are a Newton's third-law pair.
c.The normal force and the frictional force exerted on the block, because objects always exert forces of equal magnitude on each other.
d.The frictional forces that the block and the surface exert on each other, because objects always exert forces of equal magnitude on each other.
solution \
the answer will be B
for a body to travel in a horizontal direction, it must be equal in direction to the frictional force which is in opposite direction to the force applied to move the block.
Also Newton's third law of motion must be obeyed , which states that action and reaction are equal and opposite
Dense substances sink into the earth's core heated earth's interior through friction. Hope this helped!