5. Two 25.0-N weights are suspended at opposite ends of a rope that passes over å light, frictionless pulley. The pulley is attached to a cha in that goes to the ceiling. (a) What is the tension in the rope? (b) What is the tension in the chain?
5. Two 25.0-N weights are suspended at opposite ends of a rope that passes over å light, frictionless pulley. The pulley is attached to a cha in that goes to the ceiling. (a) What is the tension in the rope? (b) What is the tension in the chain?
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Please answer 5 to 9 only
Transcribed Image Text:1. A dog running in an open field has components of velocity v, -2.6 m/s and v. -2.8 m/satt. 10.0s. For
the time interval from t 10.0s to ta-20.0 s the average acceleration of the dog has magnitude 0.45 m/s²
and directie 1,0° measured from the +x-axis toward the +y-axis. At t₂-20.0 s,
dy-components of the dog's velocity?
what are the
b. What are the magn and direction of the dog's velocity?
Sketch the velocity vectors d How do these two vectors differ?
building and throws a
an ign
c.
2. A man stands on the roof of a 15.0-m
at an angle of 33.0° above the horizontal.
above the roof reached by the rock; (b) the m
rock just before it strikes the ground
base of the building to the poi
3. A Ferris wheel with
788 N
the horize
ere the rock strikes the g
4.0 m is turning about a horizontalax rough
its center (refer gure). The linear speed of a passenger on the rim is
constan equal to 7.00 m/s. What are the magnitude and direction of the
pa's acceleration as she passes through (a) the lowest point in her
cular motion? (b) The highest point in her circular motion? (c) How much
time does it take the Ferris wheel to make one revolution?
32
53°
a velocity of magnitude 30.0 m/s
resistance. Calculate (a) the maximum height
985 N
411 N
of the velocity of the
range from the
find the magnitude and direction of the resultant of the three pulls.
5.
Two 25.0-N weights are suspended at opposite ends of a rope that passes over a
light, frictionless pulley. The pulley is attached to a chain that goes to the ceiling. (a)
What is the tension in the rope? (b) What is the tension in the chain?
7.
6. On September 8, 2004, the Genesis spacecraft crashed in the Utah desert
because its parachute did not open. The 210-kg capsule hit the ground at 311 km/h
and penetrated the soil to a depth of 81.0 cm. (a) Assuming it to be constant, what was its acceleration (in
m/s² and in g's) during the crash? (b) What force did the ground exert on the capsule during the crash?
Express the force in newtons and as a multiple of the capsule's weight. (c) For how long did this force last?
A stonemason drags a marble block across a floor by pulling on a rope attached to the block. The block is
not necessarily in equilibrium. How are the various forces related? What are the action-reaction pair?
You want to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230
N horizontal force. Once the crate "break loose" and starts to move, you can keep it moving at constant
velocity with only 200 N. What are the coefficients of static and kinetic
friction?
8.
Workmen are trying to free an SUV stuck in the mud. To extricate the vehicle,
they use three horizontal rones ducing the force vectors shown in the figure. (a)
Find the x-components of each of the three pulls. Use the components to
9. A small car with mass 0.800 kg travels at constant speed on the inside of a
track that is a vertical circle with radius 5.00 m (Fig. E5.42). If the normal
force exerted by the track on the car when it is at the top of the track (point
B) is 6.00 N, what is the normal force on the car when it is at the bottom of
the track (point A)?
v = 12.0 m/s
5.00 m
12.0 m/s
A
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