An old building is being demolished by swinging a heavy metal ball from a crane. Suppose that such a 115kg ball swings from a 20
-m-long wire at speed 12m/s as the wire passes the vertical orientation.
a) What tension force must the wire be able to withstand in order not to break?
b)Assume the ball stops after sinking 1.5 m into the wall. What was the average force that the ball exerted on the wall?
a) What tension force must the wire be able to withstand in order not to break?
b)Assume the ball stops after sinking 1.5 m into the wall. What was the average force that the ball exerted on the wall?
1 answer:
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Answer:
19.01 N
Explanation:
F = Force being applied to the crate = 45 N
= Angle at which the force is being applied =
Horizontal component of force is given by
The horizontal component of the force acting on the crate is 19.01 N.
Answer:
Explanation:
Let the ball is thrown upwards with speed u and reaches upto height h.
Use III equation of motion
here, final velocity v = 0
So,
Now as the ball reaches the maximum height, it starts falling freely. Let it strkes with the ground with velocity v'.
here, u = 0
So,
It means the velocity is same as the velocity of projection.