Answer:
Normal Force is usually perpendicular to the movement and static friction usually means that there is no movement.
Explanation:
The work donde by any force on an object is equal to the displacement of the object multiplied by the component of the force that is in the direction of the displacement.
Normal force is usually perpendicular to the movement, so there is no component in the direction of the displacement. This is why it is zero in most circumstances.
<em>Static</em> friction on the other hand, usually means that there is no movement at all (it's static). It means that there is no displacement between the object and ground (in most cases). If there is no displacement, there is no work.
D. colour blindness
"red-sensitive" just means that the nerves are able to see red light
Answer:
Explanation:
B = Magnetic field =
r = Radius of rim = 16 m
t = Time = 90 seconds
A = Area of rim =
EMF is given by
The magnitude of the induced emf between the hub and the rim is .
Answer: Option C) Warm air is less dense than cold air
Explanation:
Due to greater temperature of warm air than cold air, the space between intermediate molecules is more as compared to cold air. It means the warm air expands. Hence, the density of warm air is less than cold air. On the other hand, the cold air comparatively denser and sinks. Warm air is lighter and rises.
Thus, correct option is C) Warm air is less dense than cold air.
Answer:
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