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6.8 Power -- Part 9
We sketched the situation.
If the ladder is too large an angle from the vertical, it will slide down the wall.
The force diagram der and the painter should be used together.
Rather than determining the center of mass, we have kept the forces of Earth on the ladder and painter separate.
Ladder out of each seems reasonable and similar to what we do when someone uses a ladder in real life.
There is a warning not to have the angle exceed 15.
Earth exerts less force on the object being lifted than the muscles in the body do.
You can use your understanding of static equilibrium to get rid of this phenomenon.
A leaf flutters.
A chemistry book rests on top of a physics textbook.
You have an object that is irregular.
A hammock is between trees.
The ropes have an equal chance to break.
The objects are not in the axis of rotation.
Why do you tilt your body?
Give an example of an object that is moving quickly.
10 is the force that the body muscles exert on bones.
A ladder is leaning against a wall.
For each force, identify two interacting objects.
Is it possible that an object won't be in equilibrium when 22?
It takes a large example to pul ing directly on the nail.
Is it harder to do a sit-up with stretched hands?
The two conditions are not the same.
It's better to estimate the problem rather than make a specific answer.
You have to make a drawing or graph as part of your calculations.
This is your solution.
You have a computer.
The more difficult problems should be estimated.
The Torque that balances those produced by shown object O is caused by 3 on O.
A 100N force was found on the knot by 4 on O.
64 N is the B knot's location.
A ladder resting against a house wal makes a 30 angle with the wall.
Between the top of the ladder and the wall the coefficient of static friction is zero, while between the ladder feet and the ground it is 0.40.
Luis (rope 3) was ex- 13 The machine shop you work in needs a force that balances the first two so that the knot doesn't move the big engine to the left in order to slide.
The rope- pulling exercise described in the previous two problems was joined by Kate.
They tied four ropes to the ring.
The ring should be in equilibrium with 4 on R. You exert a 630@N force on rope 2 in the previ and use the first condition of equilibrium to write a two-equa ous problem.
If you replace the light in safe, the ropes will exert on the knot.
The rope length is 20 m and the problem is with a heavier object and ropes.
The numbers 2 and 3 are shown in Figure P9.
If the tension of Chapter 7 exceeds 6700 N, the rope will break.
A man is sitting on one end and the other.
A woman sits on the other end of an apparatus to lift hospital patients.
You have a flat tire.
If subjected to a Torque greater than 3300 N#m, ject A will break.
The bers in Figure P7.24 seesaw are 1.2 m from the ground.
You are standing at the end of a diving board.
You can make a list of physical quantities and show how you will change them with different dimensions.
You put one penny in the bottom left cup, three pennies in the bottom right cup, eleven pennies in the middle right cup, and five pennies in the top left cup.
Kate is sitting on a swing.
Kate sits on the right side of the swing because it is wet on the left side.
Kate's mass is 55 kilo and the swing seat's mass is 10 kilo.
The two cables exert force on the swing.
Ray decided to paint the outside of his uncle's house.
He uses a board supported by cables to paint the second floor.
The board has a large mass.
Ray is 1.0 m from the left cable.
You put a board across a chair to seat three.
A group of physics students are at a party at your house.
2.5 m from one end is where Dan sits.
Komila needs to balance the seesaw by sitting at the other end of the board.
The table exerts force on the bag of vegetables at one end and the bag of fruit hand at the other end.
2 at the right when you lift a barbel.
A person has a broken leg.
A person is standing at one end of a boat.
The block 80 cm with respect to the bottom of the lake should be the size of the rope pulling on the leg if the boat moves so fast that it exerts a 120@N force on it.
Two people are holding hands and standing on erblades.
A person with a height of 1.88 m is lying on a light board with scales under their feet and under their head.
When he bends over 43, estimate the location of the per son's center mass.
He is touching the floor with his hands while you are working out.
A seesaw has a mass of 30 kg, a length of 3.0 m, and a fulcrum cord attached to a hook on the wall.
Determine the mag on one end and a person sits on the other.
The thigh bone exerts on the calf bone at the knee joint.
You have a 10 kilo table with each leg of mass 1.0 kilo.
A man is holding a child with both hands and his elbow bent 90 degrees.
Determine the force that each of his muscles must exert on the forearm in order to hold the child in this position.
You use the ar of the arm to hang the flowerpot.
The force that his triceps muscle must exert on his forearm is not known, but it looks light.
It is much easier to push a rock than it is to pull in an experiment.
You can draw a picture to explain your decision.
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