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vaieri [72.5K]
3 years ago
9

Suppose a star the size of our Sun, but of mass 9.0 times as great, were rotating at a speed of 1.0 revolution every 17 days. If

it were to undergo gravitational collapse to a neutron star of radius 15 km, losing 3/4 of its mass in the process, what would its rotation speed be? Assume the star is a uniform sphere at all times
Physics
1 answer:
Tanya [424]3 years ago
4 0
Use the conservation of angular momentum; angular momentum at the beginning = angular momentum at the end 
Conservation of angular momentum: 
I1 w1 = I2 w2 
Where I is the moment of inertia. For a sphere, I=2/5 m R^2. Substituting into the equation above we get 
w2 = I1 w1 / I2 = w1 m1 R1^2 / (m2 R2^2) 
w2 = w1 4 * (R1/R2)^2
= 4*(1)*(7E5/7.5)^2
= 3.48E10 revs/(17days)
= 2.04705882 x 10^9 revs/sec
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If red light hits a red filter, what kind of light comes through the filter?
Roman55 [17]
A. red, is the correct answer. A red filter only lets red light through, whether white or red light passes through it.
Hope this helps, and have a great day!

8 0
3 years ago
A 25 - kg television set rests on four rubber pads , each having a height of 1 . 0 cm and a radius of 0 . 60 cm . A 200 - N hori
Svetlanka [38]

Answer:

Thus it moves 1.7 mm sideways

Solution:

As per the question:

Mass of the television, m = 25 kg

Height of the rubber pads, h = 1.0 cm = 0.01 m

Radius, R = 0.60 cm = 0.006 m

Horizontal force, F = 200 N

Shear Modulus of Rubber, G = 2.6\times 10^{6}\ N/m^{2}

Now,

To calculate the distance moved:

G = \frac{shear\ stress}{shear\ strain}

G = \frac{\frac{Force}{Area}}{\frac{\Delta l}{L}} = \frac{Fl}{A\Delta L}

where

\Delta L = distance moved

Area of 4 rubber pads, A = 4\times \pi R^{2}

Now,

\Delta L = \frac{200\times 0.01}{4\times \pi 0.006^{2}\times 2.6\times 10^{6}} = 1.7\times 10^{- 3}\ m = 1.7\ mm

6 0
3 years ago
A student drives 105.0 mi with an average speed of 61.0 mi/h for exactly 1 hour and 30
disa [49]

Answer:

91.5 miles

Explanation:

61 miles per hour so 61(x amount of hours)

so 61 x 1.5 hours is 91.5 miles

4 0
3 years ago
Question 1 of 10 Which characteristic of nuclear fission makes it hazardous?
notsponge [240]

Answer:

D.

The radioactive wastes it produces can spread to any part of the environment.

Explanation:

Fission is the name given to the splitting of a heavy nucleus into two medium-mass nuclei. Fission is said to be induced if it results from the absorption of a neutron to form an unstable nucleus that decays by fission. The induced fission usually produces further neutrons accompanying the fission fragments.

8 0
2 years ago
Two stars in a binary system orbit around their center of mass the centers of the two stars are 7.17 multiply 10 to the power 11
yKpoI14uk [10]

Answer:

1.512 × 10^(30) kg

Explanation:

Distance between centre of the 2 stars: x_2 = 7.17 × 10^(11) m

Mass of larger star; m1 = 3.7 x 10^(30) kg

Distance of larger star from the system center of mass; x_cm = 2.08 × 10^(11) m

Let the initial distance be x1 = 0

Thus, to find the mass(m2) of the smaller star, we will use the formula;

m2 = m1(x_cm - x1)/(x_2 - x_cm)

Plugging in the relevant values, we have;

m2 = (3.7 x 10^(30)) × ((2.08 × 10^(11)) - 0)/((7.17 × 10^(11)) - (2.08 × 10^(11)))

m2 = 151.2 × 10^(28) kg = 1.512 × 10^(30) kg

4 0
2 years ago
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