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The sled in the figure below is stuck in the snow. A child pulls on the rope and finds that the sled just barely begins to move when he pulls with a force of22N, with the rope at an angle of?=34Â°with respect to the horizontal. The mass of the sled is15kg.(a) Sketch the sled and all the forces acting on it.
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(b) Determine the components of all the forces on the sled along the coordinate axes. (Enter the magnitude only.)
T_{x}  =N 
T_{y}  =N 
mg  =N 
F_{friction}  =N 
The normal forceNwill be in theSelect+xx+yydirection.
The friction force will be in theSelect+xx+yydirection.
(c) Write the conditions for static equilibrium along your two coordinate directions. (Use the following as necessary:T_{x},T_{y},m,g,F_{friction}, andNand indicate the direction with the signs of these values.)
SF_{x}  =  = 0 
SF_{y}  =  = 0 
(d) What is the coefficient of friction between the sled and the snow?
(e) Is this the coefficient of static friction or the coefficient of kinetic friction?
coefficient of static frictioncoefficient of kinetic friction
(f) If the child continues to pull on the sled and it has an acceleration of0.33m/s^{2}, find the coefficient of kinetic friction between the sled and the snow.
Viewing Saved WorkRevert to Last Response2.0/3 pointsPrevious AnswersGioCP2 4.P.007.My NotesA system of cables is used to support a crate of massm=42kg as shown in the figure below (?=58Â°). Find the tensions in all three cables.
T_{1}=  N 
T_{2}=  N 
T_{3}=  N 
3.â€“/7 pointsGioCP2 4.P.008.My NotesBalancing act. The tightrope walker in the figure below gets tired and decides to stop for a rest. During this rest period, she is in translational equilibrium. She stops at middle of the rope and finds that both sides of the rope make an angle of?=14.60Â°with the horizontal.(a) Sketch the walker and the rope. Show all the forces acting on the point of the rope on which the walker stands (call this pointP). Also include a coordinate system (take up and to the right to be the positive directions, and the tightrope walker to be the origin). (Do this on paper. Your instructor may ask you to turn in this work.)
(b) Determine the components of all the forces on pointPalong the coordinate axes. (Use the following as necessary:Tfor the tension force and?. Do not substitute numerical values; use variables only.)
Left side of the rope  Right side of the rope 

T_{x}=
 T_{x}=

T_{y}=
 T_{y}=

(c) Write the conditions for static equilibrium along your two coordinate directions. (Use the following as necessary:m,g,T, and?. Do not substitute numerical values; use variables only.)
F_{x}=
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= 0
F_{y}=
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= 0
(d) If the mass of the tightrope walker is60kg, what is the tension in the rope?
T=N
4.â€“/2 pointsGioCP2 4.P.009.My NotesA flag of mass2.4kg is supported by a single rope as shown in the figure below. A strong horizontal wind exerts a force of13N on the flag. Find the tension in the rope and the angle?the rope makes with the horizontal.
Tension =  N 
?=  Â° 
5.â€“/9 pointsGioCP2 4.P.010.My NotesA car of mass1391kg is parked on a very slippery hillside (see figure below). To keep it from sliding down the hill (?=14Â°), the owner attaches a cable.(a) Sketch all the forces on the car. (Take the positivexdirection to be along the path of the car, and the positiveydirection to be in the same direction as the normal force on the car. Do this on paper. Your instructor may ask you to turn in this work.)
(b) Determine the components of all the forces on the car along the coordinate axes.
F_{gravityx}=N
F_{gravityy}=N
The normal forceNis in theSelectnegativepositiveSelectyxdirection.
The tensionTis in theSelectpositivenegativeSelectxydirection.
(c) Write the conditions for static equilibrium along your two coordinate directions. (Use the following as necessary:?,m,g,Tfor the magnitude of the tension, andNfor the magnitude of the normal force. Do not substitute numerical values; use variables only.)
F_{x}=
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= 0
F_{y}=
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= 0
(d) If there is no frictional force between the road and the tires, what is the tension in the cable?
T=N
6.â€“/4 pointsGioCP2 4.P.015.My NotesA rock is thrown horizontally with a speed of15m/s from a vertical cliff of height35m.(a) How long does it take to reach the horizontal ground below?
s
(b) How far will it land from the base of the cliff?
m
(c) What is the velocity (magnitude and direction counterclockwise from the +xaxis, which is the initial horizontal direction in which the rock was thrown) of the rock just before it hits the ground?
Magnitude  m/s 
Direction  Â° 
7.â€“/3 pointsGioCP2 4.P.019.My NotesA soccer ball is kicked with an initial speed of22m/s at an angle of25Â°with respect to the horizontal.(a) Find the maximum height reached by the ball.
m
(b) Find the speed of the ball when it is at the highest point on its trajectory.
m/s
(c) Where does the ball land? That is, what is the range of the ball?
m
8.â€“/6 pointsGioCP2 4.P.020.My NotesConsider a rock that is thrown off a bridge of height9m at an angle?=23Â°with respect to the horizontal as shown in the figure below. If the initial speed the rock is thrown is13m/s, find the following quantities.(a) The time it takes the rock to reach its maximum height.
s
(b) The maximum height reached by the rock.
m
(c) The time at which the rock lands.
s
(d) The place where the rock lands.
m
(e) The velocity of the rock (magnitude and direction) just before it lands.
magnitude  m/s 
direction  Â° 
9.â€“/2 pointsGioCP2 4.P.023.My NotesA horizontal rifle is fired at a target46m away. The bullet falls vertically a distance of10cm on the way to the target.(a) What is the speed of the bullet just after it left the rifle?
m/s
(b) What is the speed of the bullet just before it hits the target?
m/s
10.â€“/2 pointsGioCP2 4.P.025.My Notes
Question Part 
Points 
Submissions Used 
Consider the game of baseball. A pitcher throws a ball to the catcher, with a speed of98miles per hour (43.81m/s). If the velocity of the ball is horizontal when it leaves the pitcher"s hand, how far (vertically) will it fall on the way to the catcher? The distance from the pitcher to the catcher is60.5feet (the pitching distance used from1893 to present). Express your answer in meters and feet.
m
ft
11.â€“/1 pointsGioCP2 4.P.047.My Notes
Question Part 
Points 
Submissions Used 
A sled is pulled with a horizontal force of16N along a level trail, and the acceleration is found to be0.40m/s^{2}. An extra massm=4.1kg is placed on the sled. If the same force is just barely able to keep the sled moving, what is the coefficient of kinetic friction between the sled and the trail?
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