Homework Answers
We know by law of conservation of angular momentum
I1w1 = I2w2 where I is moment of inertia and w is rotational speed
w = 2*pi/T
w1 = 2*3.14/(24*24*60*60) rad
Therefore
I1w1 = I2w2
(2/5*M*R1^2*2*PI)/(24*24*3600) = (2/5*M*R2^2*2*pi)/(T)
T = 12.5e3*24*24*3600/(3.45e8) = 75.13 seconds
already did problem 2 which is 2310 and the period is .00272 i need help on...
already did problem 2 which is 2310 and the period is
.00272 i need help on extra credit problem
Problem 2 5 x 1031 kg and a radius of 3.45 x 105 km is initially rotating on A star with a mass of 1.2 its axis with a period of 24.0 days (remember, the period is the time it takes to complete one full revolution). Suppose the star collapses in on itself and becomes a neutron star with a radius...
need help on C. Conservation of angular momentum A spherical star with radius R1 7.96 x...
need help on C.
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Please solve for Tf and how
fast the neuron star rotate in rotations per seconds.
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An isolated star with the radius of the Sun (6.95 × 108 m) rotates on an axis through its centre once every 2.16 × 106 s. It collapses under gravity to form a much denser star with the radius of the Earth (6.38 × 106 m). For the purposes of this question, you may assume that no matter is lost from the star during its collapse. You may also treat the star as a homogeneous sphere before and after the...
10*) The Sun has approximate radius 7×108 m, and rotates around its axis once every 27...
10*) The Sun has approximate radius 7×108 m, and rotates around
its axis once every 27 days. a) Find its angular velocity in rad/s,
and (assuming it is a uniform sphere) write a formula for its
angular momentum expressing it in terms of its mass M (you do not
need to substitute a value for M). b) Suppose the Sun were to
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7&8 7. Antares is a star in Scorpius constellation. Its radius is 3.0AU and its mas...
7&8
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9. (5 Pts.) A star with a radius R, 109 m is rotating with initial angular...
9. (5 Pts.) A star with a radius R, 109 m is rotating with initial angular velocity w 108 rad/s. The star collapses in on itself until it becomes a neutron star with the same mass, and a final radius Ry 10t m. Modeling the star as a uniform solid sphere, what is the final angular velocity of the star? (Hint: angular momentum is conserved)
Question 16 A sun-like star with mass M = 2.00 x 1030 kg and radius R...
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A rotor disk in your car's wheel with radius of 30.0 cm and mass of 15.0...
A rotor disk in your car's wheel with radius of 30.0 cm and mass of 15.0 kg rotates with 800 rpm and it slows down to 50 rpm in 10 second. Find its angular acceleration? (b) Number of revolutions during this period of time (c) The required force to do this action during this period of time. Antares is a star in Scorpius constellation. Its radius is 3.0AU and its mas is about 12 times the mass of the sun....
The mass of a star is 1.770×1031 kg and it performs one rotation in 21.90 days....
The mass of a star is 1.770×1031 kg and it performs one rotation in 21.90 days. Find its new period (in days) if the diameter suddenly shrinks to 0.590 times its present size. Assume a uniform mass distribution before and after. A figure skater is spinning with an initial angular speed of 9.8rad/s. He then pulls his arms in, reducing his moment of inertia to 0.27 times its original value. What is his angular speed after pulling in his arms?...
already did problem 2 which is 2310 and the period is
.00272 i need help on extra credit problem
Problem 2 5 x 1031 kg and a radius of 3.45 x 105 km is initially rotating on A star with a mass of 1.2 its axis with a period of 24.0 days (remember, the period is the time it takes to complete one full revolution). Suppose the star collapses in on itself and becomes a neutron star with a radius...
need help on C.
Conservation of angular momentum A spherical star with radius R1 7.96 x 10 km and rotating with angular speed (o 3,92 x 10s rad/s suddenly collapses into a neutron star. The neutron star emits a beam of X-rays directed radially outward that can be seen by an observatory on the earth r 4.55 x 104 km from the star. The X-ray beam sweeps past the earth with a tangential speed v 7.40 x 10 km/s each...
Please solve for Tf and how
fast the neuron star rotate in rotations per seconds.
Formation of a Neutron Star A star rotates with a period of 29 days about an axis through its center. The period is the time interval required for a point on the star's equator to make one complete revolution around the axis of rotation. After the star undergoes a supernova explosion, the stellar core, which had a radlus of 1.5 x 104 km, collapses into...
10*) The Sun has approximate radius 7×108 m, and rotates around
its axis once every 27 days. a) Find its angular velocity in rad/s,
and (assuming it is a uniform sphere) write a formula for its
angular momentum expressing it in terms of its mass M (you do not
need to substitute a value for M). b) Suppose the Sun were to
collapse to a neutron star, which is a much denser state, without
losing any mass and without being...
7&8
7. Antares is a star in Scorpius constellation. Its radius is 3.0AU and its mas is about 12 times the mass of the sun. Antares orbital speed is 20.7 km/sec. Eventually after a couple million years Antares will be converted to a neutron star. Its radius will be 4.3*10-5 AU. Find its orbital speed after it becomes neutron star? Find your answer by rpm. Moment of inertia of sphere is = 2/5 MR2 - 8. A rotor disk in...
9. (5 Pts.) A star with a radius R, 109 m is rotating with initial angular velocity w 108 rad/s. The star collapses in on itself until it becomes a neutron star with the same mass, and a final radius Ry 10t m. Modeling the star as a uniform solid sphere, what is the final angular velocity of the star? (Hint: angular momentum is conserved)
Question 16 A sun-like star with mass M = 2.00 x 1030 kg and radius R = 7.0 x 10% km rotating once per month collapses into a neutron star (r = 16 km). What is the rotational speed of the sun-like star in rev/s? (1 month - 30 days, 1 year = 365 days, and 1 day = 86400 s.) 30.0 rew's 3.86 x 107 revi's 1.16 x 105re's 0.03 rew's 2.74x10 rew's 10 rew's 10 pts D Question...
A rotor disk in your car's wheel with radius of 30.0 cm and mass of 15.0 kg rotates with 800 rpm and it slows down to 50 rpm in 10 second. Find its angular acceleration? (b) Number of revolutions during this period of time (c) The required force to do this action during this period of time. Antares is a star in Scorpius constellation. Its radius is 3.0AU and its mas is about 12 times the mass of the sun....
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