Answer:
Explanation:
<u>Electric Resistance and Temperature </u>
For some materials, resistivity is linearly related to the temperature. The function that relates them is
Where Ro is the electric resistance at 20°C, is the temperature coefficient of the conductor, T is the actual temperature at which we want to compute R, and To is the initial temperature, usually 20°C.
The problem gives us the following values
Thus
1) Magnitude of the net force: 20.8 N
2) Angle: clockwise from positive x-direction
Explanation:
1)
First of all, we need to find the components of the resultant force along the horizontal and vertical direction.
We observe that there are two forces acting along the horizontal direction:
We notice that they act in opposite directions, so the net force in the horizontal direction is the difference between these two forces:
(to the right)
Instead, there is only one force acting in the vertical direction, so the net force in the vertical direction is:
(downward)
Therefore, the magnitude of the net force can be found by using Pythagorean's theorem:
2)
Now we have to find the angle of the resultant net force. We can do it by using the following equation:
where
is the angle, measured as clockwise from the positive x-direction (because the vertical net force is downward)
is the vertical net force
is the horizontal net force
Solving, we find:
And so the angle is
In a direction down with respect to the right.
Learn more about forces:
About addition of vectors:
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Explanation:
We have,
A projectile is launched at an angle 60° to the horizontal with some initial speed 45 m/s.
The cliff is 265 m high.
(A) The final velocity of the projectile is given by :
(B) The maximum height of the projectile is given by :
(C) The horizontal range of the motion is given by :