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6.8 Power -- Part 8

- Building con struction uses this idea a lot.
- The Eiffel Tower has a wide bottom and a narrower top.
- TheObservational Experiment Table 7.5 explains why you need to keep your feet apart when standing on a subway train.

- There are several holes in the ruler.
- The ruler swings back and forth with maximum displacement from the equilibrium position if you pul the bottom of the ruler to the side.
- The ruler swings down if disturbed.

- If the bottom of this ruler is released, it will return to equilibrium.

- If the top of the ruler is stable.

- There is no displacement that has displaced from equilibrium.

- The axis of rotation does not exert any force on the ruler or the object.

- The net force on the ruler by Earth and by the displaced is tipped over if the ruler is both positions a and b.

- The center of mass of objects is usually lower when the Torques are produced.
- If it is possible for the object to be tilted so that its center of mass is lowered, it will do so.

- If we hang the ruler using the center hole, it stays in its original position.
- The normal force that the nail exerts and the gravitati nail onal force that Earth exerts produce zero Torques.

- The ruler has no effect on displacement.

- Is it possible to balance the pointed tip of a pencil.

- There is a sketch of the Net clockwise situation.

- There is an E on P. The axis of rotation is the tip of the pen.

- This instability is caused by F on P-K tation.

- The pencil is shown below.

- Try to understand new situations and ideas that are ready to be discussed.
- The equilibrium is most stable when the center of mass of the system is in the lowest possible position or the smal est value.

- Circus tricks are included in the rules of equilibrium and stability.
- Vending machines are an application center of mass.

- A bicycle on a high wire may not be as dangerous as it looks.

- According to the U.S. Consumer Product Safety Commis- model the vending machine is just barely off sion, tipped vending machines caused 37 deaths between chine as a rigid body.

- A vending machine that is 1.83 m high, 0.84 m deep, and 0.94 m wide is shown in the side view.
- Four corners of its base are supported by a leg on the force diagram.

- The back floor has an axis of rotation.
- The person exerts force on the vending machine.

- The vending machine that was erted by the floor on the back legs did not produce a will tip.

- Both answers seem reasonable.

- To keep the vending machine tilted above the horizontal, you need to just barely lift the vending machine's front off.

- The chance of being injured by a tipped vending machine is small since a large force must be put on it to tilt it up, and it must be tilted at a fairly large angle before it reaches an unstable equilibrium.
- In regions prone to earthquakes, falling bookcases is a more common danger.
- The base of a bookcase is not very deep.
- The bookshelves above the base are the same size as the base bookshelves.

- The bookcase can tip over.
- In earthquake-prone regions, people attach a bracket to the top of the bookcase and anchor it to the wall.

- We will apply our understanding of static equilibrium to analyze three common situations: standing on your toes, lifting a heavy object, and climbing a ladder.

- In a less stressed situation, we will analyze what happens to your ankle.

- The magnitude of the force that the tibia exerts on the ground if you stand on your toes with your heel slightly is what it is.

- We sketch the foot with the distance from the joint to the Achil es tendon attachment.
- The system of interest is caused by the Torque condition of equilibrium.

- A very light foot is a rigid body.

- The force that Earth exerts on the foot is two and a half times the force that Earth exerts on the body.
- We will ignore it because it's 10 N>kg for a 70 kilogram per ing.
- The force diagram shows the force at 1750 N.

- When moving, the forces are greater.
- Every time you lift your foot to walk, run, or jump, the tendon ten sion and joint compression are more powerful than the force that Earth exerts on your entire body.

- If the person's mass was 90 kilograms instead of 70 kilograms, the Achil es tendon on the foot of the person would increase in magnitude.

- Let's apply equilibrium to this system.

- A bad way to lift.

- Improper lifting techniques can cause back problems.

- The downward pul causes a large clockwise Torque on her upper body.
- To prevent her from tipping over, her back muscles have to exert a lot of force.
- The force of the back muscles can cause damage to the disks in the lower back.
- The equilibrium equations can be used to estimate the lifting forces.

- The axis of rotation is where the back muscle body is located.

- A force dia is drawn in her lower back when she lifts a barbell.

- 133 kg219.8 N/kg2 is 323 lbs.

- 179 N 140 lbs2 is calculated using 118 kg219.8 N/kg2 and 176 N 140 lbs2 The force by which it is exerted makes a 12 angle relative to the horizontal backbone.

- D doesn't produce a Torque.

- The barbel exerts force on the upper distribution and the Earth exerts force on the upper distribution.
- The axis of rotation is at the left end of the body, while the tension of the back muscles on the upper body represents one of the disks.

- Our model of a person lifting a barbell is below.

- The force that the disk exerts on the bone is the same as the force by the back of the disk.

- The back muscles exert a force more than four times the grav out if the denominator of the terms in this equation is found.

- Two linemen standing on a 1-inch-diameter disk are equivalent to M on B cos 12 tebral disk.

- It's a better way to lift things.

- Lift your legs with your knees.
- The back muscle exerts a third of the force when it is not being lifted correctly.
- The disks in the lower back are only half the size they are.

- Consider the physics of using a ladder.

- You want the ladder to remain static when you climb it.
- The ex terior wall of the house is very smooth, meaning that it exerts a negligible friction force on the ladder.
- The floor and ladder have the same coefficients of static friction.

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