In the solution to University Physics 12th Edition, Chapter 5Question 125 CP, the free body diagram for pulley B is shown. Itsays that 2Ta - Tc = 0, so there is no net force on the pulley. Butthe pulley has acceleration, so how can this be true?

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3) (10 pts] A physics professor, working on his summer research, is struggling to put a massive telescope structure in place while it is suspended from a crane (see diagram). The mass of the structure is 1000 kg, and the correct position for it is at a 15 degree angle from directly below the crane. The crane cannot be moved. a. Draw the free-body diagram on the structure, labeling all forces. b. What horizontal force does the professor need to apply to keep the structure directly over the mounting point? c. Given a coefficient of static friction between the professor's shoes and the ground of us = 1.0, can the 90 kg professor do this? If not, how many 90-kg professors would it take (assume you can't have fractional professors, so answer with an integer)? crane professor structure mounting point

College Physics 8th Edition, Serway and Vuille

Problem number 88- Chapter 8

A 10.0-kg monkey climbs a uniformladder with weight w= 1.26x10² N and lengthL = 3.10 m as shown inthe figurebelow. The ladder rests against the wall at an angleofÎ¸ = 53Â°. The upper and lower ends of the ladderrest onfrictionless surfaces, with the lower end fastened to thewall by ahorizontal rope that is frayed and that can support amaximumtension of only 80.0 N.

(a) Draw a free-body diagram for the ladder. (Do this onpaper.Your instructor may ask you to turn in this work.)

(b) Find the normal force exerted by the bottom of theladder.
________ N

(c) Find the tension in the rope when the monkey is two-thirdsofthe way up the ladder.
_________N

(d) Find the maximum distance d that the monkey canclimbup the ladder before the rope breaks.

_________m

(e) If the horizontal surface were rough and the rope wereremoved,how would your analysis of the problem be changed and whatotherinformation would you need to answer parts (c) and (d)?
_____________________

a.) A hockey puck is observed to be sliding along a flatfrictionless surface at a speed of 4 cm/min. There is no net forceacting on the puck. Assuming it doesn't smash into anything, howfast will the puck be going 17 min later?
cm/min

b.) An object is accelerating. Which one of the followingstatements is true?
The object must be speeding up.
Gravity must be causing the object to accelerate.
The object must be changing directions.
The object must be slowing down.
There is a net force acting on the object.

c.) A 100 kg block weighs 220 lb on Earth. If the block weretransported to a planetary body that had a smaller free fallacceleration (as compared to Earth), which one of the followingwould be true?
The block would have the same weight and a smaller mass.
The block would have the same mass and a bigger weight.
The block would have the same mass and the same weight.
The block would have the same weight and a bigger mass.
The block would have the same mass and a smaller weight.
d.) What does it mean (in physics) to say that a quantity isconserved?
It means that the quantity is not being used.
It means the total amount is zero.
It means the total amount never changes.
It means it's being saved up.

e.) At a certain point in time, the total energy of a closed systemis observed to be 176 J. Which one of the following statements istrue?
Three hours later the energy of the system is 352 J.
Four hours later the energy of the system is 88 J.
All of the energy must be kinetic if the objects are moving.
Twelve hours later the energy of the system is 176 J.
Some of the energy must be potential.

g.) Which of the following statements are impossible? Choose allthat apply.
The parked truck had 8770 J of KE.
The scooter had 0 J of KE and 0 kgÂ·m/s of momentum.
A ball moving in a circle had 0 N of net force acting on it.
A box had an acceleration of 0 m/s2 while a net force of 311 Nacted on it.
Jack exerted 18 N of force due east on a cart. As a direct result,the cart exerted 18 N of force due west upon Jack.
A toothpick exerts a smaller gravitational force upon the Moon thanthe Moon exerts upon it.

a.) Two balls make up a closed system. Ball A has 701 J of energyand ball B has 78 J. After they collide, ball A has 665 J. How muchenergy does ball B have after they collide?
J

b.) An asteroid and a comet collide head on. Prior to thecollision, the asteroid has a momentum of 700,000 kgÂ·m/s up and thecomet has a momentum of 800,000 kgÂ·m/s down. After the collisionthe asteroid has a momentum of 750,000 kgÂ·m/s down. After thecollision, what is the comet's momentum?
kgÂ·m/s
North
South
East
West
Up
Down
Left
Right
No direction because the comet has stopped

c.) How much does a 28 kg object weigh on Moon? Please feel free toreference the Solar System Data table located at the beginning ofUnit II.
______N

d.) A 660 N net force acts on a 42 kg object. Determine theobject's acceleration.
_____m/s2

e.) Calculate the gravitational force between a 657 kg object(resting on Earth) and the Moon. The mass of the Moon is 7.347Ã1022kg and the distance between the object & the Moon is 3.844Ã108m.
____N

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In the solution to University Physics 12th Edition, Chapter 5Question 125 CP, the free body diagram for pulley B is shown. Itsays that 2Ta - Tc = 0, so there is no net force on the pulley. Butthe pulley has acceleration, so how can this be true?

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