We are given that,
We need to find when
The equation that relates x and can be written as,
Differentiating each side with respect to t, we get,
Replacing the value of the velocity
The value of could be found if we know the length of the beam. With this value the equation can be approximated to the relationship between the sides of the triangle that is being formed in order to obtain the numerical value. If this relation is known for the value of x = 6ft, the mathematical relation is obtained. I will add a numerical example (although the answer would end in the previous point) If the length of the beam was 10, then we would have to
Search light is rotating at a rate of 0.96rad/s
Since the direction of the force and the direction of the path is perpendicular, the person is not doing any physical work.
Answer:
Explanation:
According to the law of conservation of linear momentum, the total momentum of both pucks won't be changed regardless of their interaction if no external forces are acting on the system.
Being and the masses of pucks a and b respectively, the initial momentum of the system is
Since b is initially at rest
After the collision and being and the respective velocities, the total momentum is
Both momentums are equal, thus
Solving for
The initial kinetic energy can be found as (provided puck b is at rest)
The final kinetic energy is
The change of kinetic energy is
1 and A
2 and B
3 and D
4 and C