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'As we go from cooler stars to hotter stars, what happens to t

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'As we go from cooler stars to hotter stars, what happens to the Main Sequence life span?'

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Question 1

Medium

Two identical hollow spheres of mass

M

and radius

R

are joined together, and the combination is rotated about an axis tangent to one sphere and perpendicular to the line connecting their centres. The rotational inertia of the combination is

$10 M R^{2}$
$\frac{4}{3} M R^{2}$
$\frac{32}{3} MR^{2}$
$\frac{34}{3} M R^{2}$

Topic:

System of Particles and Rotational Motion

Book:

Physics for JEE Main and Advanced Mechanics 2 (McGraw Hill)

View 3 solutions

Question 2

Medium

A particle moving with kinetic energy

K

makes a head on elastic collision with an identical particle at rest. Find the maximum elastic potential energy of the system during collision.

Topic:

Mechanical Properties of Solids

Book:

Mechanics Volume 2 (DC Pandey)

View 2 solutions

Question 3

Medium

A child with mass

m

is standing at the edge of a horizontal disc with moment of inertia

I

, radius

R

, and initial angular velocity

ω

about its central vertical axis. The child jumps off the edge of the disc with tangential velocity

v

with respect to the ground. The new angular velocity of the disc is

$\frac{I ω ^{2} - m v ^{2}}{I}$
$\frac{( I + m R ^{2} ) ω ^{2} - m v ^{2}}{I}$
$\frac{I ω - m v R}{I}$
$\frac{( I + m R ^{2} ) ω - m v R}{I}$

Topic:

System of Particles and Rotational Motion

Book:

Physics for JEE Main and Advanced Mechanics 2 (McGraw Hill)

View 2 solutions

Question 4

Medium

A thin uniform rod of mass

M

and length

L

is hinged at its upper end, and released from rest from a horizontal position. The tension at a point located at a distance

L /3

from the hinge point, when the rod becomes vertical, will be

$22 M g /27$
$11 M g /13$
$6 Mg /11$
$2 Mg$

Topic:

System of Particles and Rotational Motion

Book:

Mechanics Volume 2 (DC Pandey)

View 2 solutions

Students who ask this question also asked

Question 1

A ray of light passes from air into water. For its deviation angle

δ = ∣ θ_{1} - θ_{2} ∣

to be

10. 0^{\circ},

what must its angle of incidence be?

Topic:

Physics

View solution

Question 2

Subcooled liquid at 5 MPa and 120Â°C is heated to a final state of 5 MPa and 500Â°C. Evaluate the specific enthalpy and specific internal energy at the initial stage by approximating the initial stage as a saturated liquid. Find the change in total enthalpy and total internal energy if the volume occupied by the liquid at the initial stage is 2 L.

Topic:

Physics

View solution

Question 3

QUESTION 13 (11 Marks) (a) Figure 3 shows a shock tube configured for particle delivery. The particles are initially located on the upstream surface of a diaphragm in the device. The driver gas (Î³=1.65; R=1578 Jkg-1 K-1) is at a pressure of 2 MPa. The shock tube section is one atmosphere of air (Î³=1.4; R=287 Jkg K-1). As usual, the driver and shock tube are respectively referred to as Region 4 and Region 1. The driver gas unsteadily expands from Region 4 to 3. Diaphragm rupture initiates a primary shock moving at M_s=2.34. Using P_1, calculate the pressure in Region 2. (1) (30% of marks) (b) For the system of (a), what is the pressure in Region 3? (20% of marks) (c) The particles accelerate in the gas unsteadily expanding from the driver (Region 4 to Region 3). Calculate the gas velocity in Region 3, by using equation (2): (1/âˆšZL) (2) p. Assuming Î³=884 m/s. (50% of marks) Particle Payload Diaphragm Driver Shock Tube Figure 3. Shock tube

Topic:

Physics

View solution

Question 4

Texts: (ScNdErYbLu),SiO, (ScNdErYbLu),Si,O, Yb,Si,O SiC Matrix Si CTE 400 500 600 700 800 900 1000 1100 1200 Temperature, Figure 1: Thermal expansion coefficient of rare earth silicates. Problem 2: Thermal Expansion. (20 points) Environmental/thermal barrier coatings have been successfully employed in the hot zone of gas turbine engines, allowing for high fuel burn temperatures and increased flight efficiency. The objective in the design and discovery of environmental barrier coatings is to identify materials with both low thermal conductivity, providing good thermal insulation, and low coefficient of thermal expansion (CTE), which matches the substrate or matrix. In a study that was published in December of 2022 (Materialia, 26, 101557, 2022), Drs. Elizabeth Opila and Patrick Hopkins showed how multi-component rare earth silicates offer a unique solution for simultaneously co-optimizing thermal expansion and thermal conductivity. How do chemical bond strength and atomic mass impact thermal expansion coefficient, or CTE? As shown in Figure, rare earth mono-silicate (Sc0.2Nd0.2Er0.2Yb0.2Lu0.2)SiO has a significantly larger CTE than di-silicate (Sc0.2Nd0.2Er0.2Yb0.2Lu0.2)2SiO7 and Yb2Si2O7 (the latter is known as the coating material in Rolls-Royce engines). Why?

Topic:

Physics

View solution

Question Text	'As we go from cooler stars to hotter stars, what happens to the Main Sequence life span?'
Topic	All topics
Subject	Physics
Class	Class 11

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