The minimum acceleration is
Explanation:
The motion of the Cessna is a uniformly accelerated motion, so we can use the following suvat equation:
where
v is the final velocity of the Cessna
u is the initial velocity
a is the acceleration
s is the distance covered when accelerated from u to v
Assuming the Cessna starts from rest, we have:
u = 0
The final velocity (lift-off speed) is:
While the maximum distance that the aircraft can cover is:
s = 205 m
Therefore, the minimum acceleration that the Cessna should have is:
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After 1 second speed = 9.8 m/s
After 2 second speed = 19.6 m/s
a. A car driving in a straight line at 20 m/s.
Explanation:
An object is in a state of equilibrium when no force is acting upon it. There are two types of equilibrium; static equilibrium and dynamic equilibrium.
Static equilibrium is a state when a body is at rest.
Dynamic equilibrium is an equilibrium state when a body is moving at a constant velocity. (Rectilinear Motion).
A car moving in a straight line at 20 m/s has a constant velocity and hence no force is acting on it. So, it is in dynamic equilibrium.
A book sitting on a table without moving is not is dynamic equilibrium but in static equilibrium.
A boy jumping off a diving board in not in equilibrium as gravitational force is acting upon him and he has a changing velocity.
A motorcycle going in a circle at a constant speed has changing velocity because the direction of the motion is constantly changing hence it is not in the state of motion.
Keywords: velocity, force, equilibrium, static equilibrium, dynamic equilibrium
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Answer:
(b) Centripetal force acts along the radius of circular path
Explanation:
Centripetal force is a force experienced by a body moving in a circular path. It is expressed mathematically ad F = mv²/r
m is the mass of the body
v is the velocity
r is the radius of the circular path
When a body moves in a circular path, work dome is zero because Centripetal force acts along the radius of circular path and the force is at right angle with the motion of body.