The transportation revolution can best be described as a period of
1 answer:
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Answer:
At the focus
Explanation:
In car head lights concave mirrors are used. The light bulbs in these headlights are place along the principal axis as shown in the figure. On this Principal axis light bulbs are place at the Focus to get maximum brightness. As from the figure we can conclude that light rays coming from infinity converse at focus thus, giving maximum brightness.
Answer:
Explanation:
The motion of a projectile consists of two independent motions:
- A uniform motion along the horizontal direction (constant velocity)
- A uniformly accelerated motion along the vertical direction (constant acceleration)
The time of flight of a projectile is given by
where
is the initial vertical velocity
is the acceleration due to gravity
Here the time of flight is
t = 8 s
So, the initial vertical velocity is:
At the same time, the horizontal distance covered by the projectile is given by
where
is the horizontal velocity, which is constant
t is the time of flight
Here we know that the range of the projectile is 0.3 km, so
d = 0.3 km = 300 m
So the horizontal velocity is
Therefore, we can find the angle of projection of the projectile by using: