Question
In: Physics
Two identical twins hold on to a rope, one at each end, on a smooth, frictionless...
Two identical twins hold on to a rope, one at each end, on a smooth, frictionless ice surface. They skate in a circle about the center of the rope (the center of mass of the two-body system) and perpendicular to the ice. The mass of each twin is 78.0 kg. The rope of negligible mass is 4.0 m long and they move at a speed of 4.90 m/s.
(a) What is the magnitude, in kg · m2/s, of the angular momentum of the system comprised of the two twins?
(b) They now pull on the rope and move closer to each other so that the rope between them is now half as long. Determine the speed, in m/s, with which they move now.
(c) The two twins have to do work in order to move closer to each other. How much work, in joules, did they do? This is the same as the change in kinetic energy.
Solutions
Expert Solution
The reason we are able to conserve angular momentum is because there is no external torgue acting on the system as the floor is frictionless.
If you are satisfied with the answer please consider upvoting it.
genius_generous answered 7 months agoRelated Solutions
Two friends hold on to a rope, one at each end, on a smooth, frictionless ice...
Two friends hold on to a rope, one at each end, on a smooth,
frictionless ice surface. They skate in a circle about an axis
through the center of the rope and perpendicular to the ice. The
mass of one friend is 81.0 kg and the other has a mass of 125.0 kg.
The rope of negligible mass is 4.5 m long and they move at a speed
of 4.50 m/s.
(a) What is the magnitude of the angular momentum...
Six sets of identical twins were randomly selected from a population of identical twins. One child...
Six sets of identical twins were randomly selected from a
population of identical twins. One child was taken at random from
each pair to form an experimental group. These children
participated in a program designed to promote creative thinking.
The other child from each pair was part of the control group that
did not participate in the program to promote creative thinking. At
the end of the program, a creative problem-solving test was given,
with the results shown in the...
Six sets of identical twins were randomly selected from a population of identical twins. One child...
Six sets of identical twins were randomly selected from a
population of identical twins. One child was taken at random from
each pair to form an experimental group. These children
participated in a program designed to promote creative thinking.
The other child from each pair was part of the control group that
did not participate in the program to promote creative thinking. At
the end of the program, a creative problem-solving test was given,
with the results shown in the...
There are two types of twins, monozygotic (identical) twins where the offspring are generated from the...
There are two types of
twins, monozygotic (identical) twins where the offspring are
generated from the unexpected splitting of the same fertilised egg,
while dizygotic (fraternal) twins arise from independent
fertilisations of two different eggs. Discuss the power
of STR profiling in discriminating between monozygotic and
dizygotic twins
8 IP Two strings that are fixed at each end are identical, except that one is...
8
IP Two strings that are fixed at each end are identical, except
that one is 0.530 cm longer than the other. Waves on these strings
propagate with a speed of 34.2 m/s , and the fundamental frequency
of the shorter string is 217 Hz . Part A What beat frequency is
produced if each string is vibrating with its fundamental
frequency? fbeat = nothing Hz Request Answer Part B Does the beat
frequency in part (a) increase or decrease...
IP Two strings that are fixed at each end are identical, except that one is 0.600...
IP Two strings that are fixed at each end are
identical, except that one is 0.600 cm longer than the other. Waves
on these strings propagate with a speed of 31.2 m/s , and the
fundamental frequency of the shorter string is 212 Hz .
Part A
What beat frequency is produced if each string is vibrating with
its fundamental frequency?
Part B
Does the beat frequency in part (a) increase or decrease if the
longer string is increased in...
Each of two identical uniform metal bars has a resistance R. The end of one bar...
Each of two identical uniform metal bars has a resistance
R.
The end of one bar is welded to the end of the other bar (Figure
1) . In terms of R, what is the resistance of this
combination?
What is the resistance if the bars are welded together along
their length? (Figure 2)
Two identical, uniform and frictionless spheres, each of mass m, rest in a rigid rectangular container...
Two identical, uniform and frictionless spheres, each of mass m,
rest in a rigid rectangular container as shown in the figure. A
line connecting their centers is at 45° to the horizontal. a)If the
angle is increased to 90° think about what happens to the forces.
This can help provide a check to your answers as we make a change
to the problem. For all of the following questions, the
configuration is now changed such that the line connecting their...
Two masses, 4.0 kg and 6.0 kg, are connected by a "massless" rope over a "frictionless"...
Two masses, 4.0 kg and 6.0 kg, are connected by a "massless"
rope over a "frictionless" pulley as pictured in the diagram. The
ramp is inclined at 30.0 degrees and the coefficient of kinetic
friction on the ramp is 0.18. a) determine acceleration of the
system once it begins to slide b) determine tension in the rope.
Show all work
Listed below are the IQ scores of identical twins that were adopted and raised apart. One...
Listed below are the IQ scores of identical twins that were
adopted and raised apart. One Twin Other Twin 90 95 99 101 105 106
109 103 111 113 98 100 89 92 115 116 100 102 107 104 110 112 102
101 98 99 92 94 100 101 111 112 117 120 102 99 95 93 105 107
Predict the IQ of the 2nd twin if the IQ of the 1st twin was
118.
Round your answer to 3...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Gives the following four numbers: a.01101010 b.11110001 c.10001000 d.00100010 then answer the questions: (i) What's the...
- Weez Ltd is a GST registered retailer of widgets with monthly accounting periods. The following is...
- explain the relationship between the SEC and the various private sector standard setting bodies that have,...
- You have been asked to prepare a December cash budget for Ashton Company, a distributor of...
- Holly bought a 7-year bond, with a 3% coupon paid semi annually. It was priced to...
- METAR Abbreviations METAR (Meteorological Aviation Report) is a format for reporting weather information, either for pilots...
- The data below are the heights of fathers and sons (inches). There are 8 rows in...
ADVERTISEMENT