I attached the missing picture.
The force of seat acting on the child is a reaction the force of child pressing down on the seat. This is the third Newton's law. The force of a child pressing down the seat and the force of the seat pushing up on the child are the same.
There two forces acting on the child. The first one is the gravitational force and the second one is centrifugal force. In this example, the force of gravity is always pulling down, but centrifugal force always acts away from the center of circular motion.
Part AFor point A we have:
![F_a=F_cf-F_g](https://tex.z-dn.net/?f=F_a%3DF_cf-F_g)
In this case, the forces are aligned, centrifugal is pointing up and gravitational is pulling down.
Part BAt the point, B situation is a bit more complicated. In this case force of gravity and centrifugal force are not aligned. We have to look at y components of this forces, y-axis, in this case, is just pointing upward.
Part CThe child will stay in place at point A when centrifugal force and force of gravity are in balance:
Answer:
120 v
Explanation:
The two resistors have an equivalent of 20 * 30 /(20+30) = 12 ohms
10 amps of current in the circuit
v = ir
= 10 * 12 = 120 volts
Here is another way:
The two resistors are in prallel so the voltae across both is the same
use the one on the right v = ir = 4 x 30 = 120 v
ANSWER
4 m
EXPLANATION
The circumference formula is,
![C=2\pi r](https://tex.z-dn.net/?f=C%3D2%5Cpi%20r)
Where r is the radius of the circle.
Solving for r,
![r=\frac{C}{2\pi}](https://tex.z-dn.net/?f=r%3D%5Cfrac%7BC%7D%7B2%5Cpi%7D)
The circumference of the swimming pool is 25.12m. If we use 3.14 for π,
![r=\frac{25.12m}{2\cdot3.14}=\frac{25.12m}{6.28}=4m](https://tex.z-dn.net/?f=r%3D%5Cfrac%7B25.12m%7D%7B2%5Ccdot3.14%7D%3D%5Cfrac%7B25.12m%7D%7B6.28%7D%3D4m)
The radius of the swimming pool is 4 m.
Answer:
a. A uniform disk of radius and mass .
Explanation:
The moment of inertia I of an object depends on a chosen axis and the mass of the object. Given the axis through the point, the inertia will be drawn from the uniform disc having a radius and the mass.
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