Answer:
2s
Explanation:
The position function of the motion can be expressed as:
where is the origin where the particle starts off,
and a = <1,2,0> m/s2. In the 3-coordinate system it can be written as
For the particle to hit the 2x+y-z=4 plane then its coordinates must meet that criteria
t = 2 or t = -1
Since t can only be positive we will pick t = 2s
Answer:
The work done required on the coin during the displacement is 21.75 w.
Explanation:
Given that,
A coin slides over a friction-less plane i.e friction force = 0.
The co-ordinate of the given point is (1.40 m, 7.20 m).
The position vector of the given point is represented by .
The displacement of the coin is
The force has magnitude 4.50 N and its makes an angle 128° with positive x axis.
Then x component of the force = 4.50 cos128°
The y component of the force = 4.50 sin128°
Then the position vector of the force is
We know that,
work done is a scalar product of force and displacement.
=(-2.77×1.40+ 3.56×7.20) w
=21.75 w
The work done required on the coin during the displacement is 21.75 w.