Answer:
The work done is 13.875 J.
Explanation:
Given that,
Mass of ball = 0.25 kg
Initial speed = 20 m/s
Final speed = 17 m/s
We need to calculate the work done
Using formula of work done
Work done by the friction
Negative sign shows the friction always against displacement.
Hence, The work done is 13.875 J.
Answer:
angle of refraction is the same as angle of incidence
Explanation:
The magnitude of the vertical force that a concrete support exerts on the bridge at the far end is 201.25 N.
<h3>What is force?</h3>
The force is an action of push or pull which makes a body to move or stop.
Given is the weight of tourist W = 805 N and L is the length of the bridge.
Let the reaction force at both the ends of the bridge is R1 and R2.
Taking the moments about point A,
R1 x 0 - W x L/4 +R2 x L =0
R2 = W/4
R2 = 805 /4
R2 = 201.25 N
Thus, the magnitude of the vertical force that a concrete support exerts on the bridge at the far end is 201.25 N.
Learn more about force.
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By knowing the distance between two objects we can not get enough ideas about the location of these respective objects. It can be easily understood from a simple example.
Let us consider two bodies A and B which are in a two dimensional plane. .Let the co-ordinates of body A is [2,2].
Let us consider two possible co-ordinate pairs [1,0] and [0,1]
Let the body B is at [1,0].
Hence the distance between A and B is
Let the body B is shifted to [0,1] now.
Now the distance between A and B will be
Here we observe that distance in each case is same .But in first case the body B was on +X- axis while in second case the body B was on +Y- axis.
Hence distance between points may be same in different planes, but only the distance can not get enough ideas about the location of the objects.It is the points in specific reference frames gives the ideas about the location of the objects. As position is relative ,hence for complete location of a object,the observer also plays a vital role here.