Recitation class презентация

Chapter 2

Слайд 1Recitation Class


Слайд 2Chapter 2


Слайд 3[Problem 29] A car moving at a constant velocity of 46

m/s passes a traffic cop who is readily sitting on his motorcycle. After a reaction time of 1.0s, the cop begins to chase the speeding car with a constant acceleration of 4.0 m/s^2. How much time does the cop need to overtake the speeding car?

Слайд 4[Problem 29] A car moving at a constant velocity of 46

m/s passes a traffic cop who is readily sitting on his motorcycle. After a reaction time of 1.0s, the cop begins to chase the speeding car with a constant acceleration of 4.0 m/s^2. How much time does the cop need to overtake the speeding car?

Car

 

 

Car

 

Car

 

 

 

 


Слайд 5[Problem 58] An object falls a distance h from rest. If

it travels 0.60h in the last 1.00 s, find (a) the time and (b) the height of its fall. (c) Explain the physically unacceptable solution of the quadratic equation in t that you obtain.?

Слайд 6[Problem 58] An object falls a distance h from rest. If

it travels 0.60h in the last 1.00 s, find (a) the time and (b) the height of its fall. (c) Explain the physically unacceptable solution of the quadratic equation in t that you obtain.?

Слайд 7 

 
[Problem 58] An object falls a distance h from rest. If

it travels 0.60h in the last 1.00 s, find (a) the time and (b) the height of its fall. (c) Explain the physically unacceptable solution of the quadratic equation in t that you obtain.?

Слайд 8 
 

 
[Problem 58] An object falls a distance h from rest. If

it travels 0.60h in the last 1.00 s, find (a) the time and (b) the height of its fall. (c) Explain the physically unacceptable solution of the quadratic equation in t that you obtain.?

Слайд 9 
 

 
 
 
[Problem 58] An object falls a distance h from rest. If

it travels 0.60h in the last 1.00 s, find (a) the time and (b) the height of its fall. (c) Explain the physically unacceptable solution of the quadratic equation in t that you obtain.?

1.00 s


Слайд 10 
 
 

 
 
 
 
 
 
 
1.00 s


Слайд 11 
 
 

 
 
 
 
 
 
 
 
1.00 s


Слайд 12 
 
 

 
 
 
 
 
 
 
 
 
1.00 s


Слайд 13 
 
 

 
 
 
 
 
 
 
 
 
 
 
1.00 s


Слайд 14 
 
 

 
 
 
 
 
 
 
 

 
 
 
 
1.00 s


Слайд 15 
 
 

 
 
 
 
 
 
 
 

 
 
 
 
1.00 s


Слайд 16 
 
 

 
 
 
 
 
 
 
 
 
1.00 s


Слайд 17 
 
 

 
 
 
 
 
 
We take
 
Why?
 
 
 
1.00 s


Слайд 18 
 
 

 
 
 
 
 
 
 
We take
 
Why?
Negative time indicates a time before the object was

dropped

Answer of (c)

 

 

1.00 s


Слайд 19 
 
 

 
 
 
 
 
 
 
Plugging Eq. (3) into (1),
 
 
 
 
1.00 s


Слайд 20 
 
 

 
 
 
 
 
 
 
 
 
1.00 s


Слайд 21Chapter 4


Слайд 23 
 



 
 
 
 
 
 
 
 
 


Слайд 24Chapter 5


Слайд 26 
(a)
 
 
(b)
 
before the block is lifted off the floor
 
(c) acceleration is

still in the x axis

 


Слайд 27[Problem 67] The figure shows three blocks attached by cords that

loop over frictionless pulleys. Block B lies on a frictionless table; the masses are mA = 6.00 kg, mB = 8.00 kg, and mC = 10.0 kg. When the blocks are released, what is the tension in the cord at the right?

Слайд 28[Problem 67] The figure shows three blocks attached by cords that

loop over frictionless pulleys. Block B lies on a frictionless table; the masses are mA = 6.00 kg, mB = 8.00 kg, and mC = 10.0 kg. When the blocks are released, what is the tension in the cord at the right?

mCg

mAg

TC

Assume a clockwise motion
(Downward is positive for block C,
Rightward is positive for block B,
Upward is positive for block A.)


 


Слайд 29[Problem 67] The figure shows three blocks attached by cords that

loop over frictionless pulleys. Block B lies on a frictionless table; the masses are mA = 6.00 kg, mB = 8.00 kg, and mC = 10.0 kg. When the blocks are released, what is the tension in the cord at the right?

mCg

mAg

TC

Assume a clockwise motion
(Downward is positive for block C,
Rightward is positive for block B,
Upward is positive for block A.)

 

 


 


Слайд 30[Problem 67] The figure shows three blocks attached by cords that

loop over frictionless pulleys. Block B lies on a frictionless table; the masses are mA = 6.00 kg, mB = 8.00 kg, and mC = 10.0 kg. When the blocks are released, what is the tension in the cord at the right?

mCg

mAg

TC

Assume a clockwise motion
(Downward is positive for block C,
Rightward is positive for block B,
Upward is positive for block A.)

 

 

 

The force for just on block C:

 


 


Слайд 31Chapter 6


Слайд 32[Problem 10] In the figure, a block of weight W experiences

two applied forces, each of magnitude W/2. What coefficient for static friction between the block and the floor puts the block on the verge of sliding?







W/2

W/2

 

 


Слайд 33





W/2
W/2
 
 
 
W/4
W
 
[Problem 10] In the figure, a block of weight W experiences

two applied forces, each of magnitude W/2. What coefficient for static friction between the block and the floor puts the block on the verge of sliding?

Слайд 34





W/2
W/2
 
 
 
W/4
W
 
 
 
[Problem 10] In the figure, a block of weight W experiences

two applied forces, each of magnitude W/2. What coefficient for static friction between the block and the floor puts the block on the verge of sliding?

Слайд 36 
 
 
 
 
 


Слайд 37 
 
 
 

 




Block does not stick together !!
 
 
80 N
59 N


Слайд 38 
(a) accelerations of the block
 
 
 
(b) accelerations of the slab
 
 
 
 
 


Слайд 40 

 
 
boom
car is at rest at the top
 
car and riders
car+riders
 


Слайд 47 


 
 
car and riders
 
 
 
 
 
 
 


Слайд 48 


 
 
car and riders
 
 
 
(a), (b)
 
 
 
the direction of the force from the

boom is upward

Слайд 49 


 
 
car and riders
 
 
 
(c), (d)
 
 
 
the direction of the force from the

boom is downward

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