Author Question: Describe the two step process used to calculate thermal stress in a beam with ends which are rigidly ... (Read 44 times)

sheilaspns · **on:** Jul 29, 2018

Describe the two step process used to calculate thermal stress in a beam with ends which are rigidly fixed.

What will be an ideal response?

Question 2

A 60.0-kg satellite is in orbit a distance 2000 km above the surface of the earth. The mass of the earth is 5.976 x 1024 kg and the radius of the earth is 6.378 106 m.

(a) What is the change in the gravitational potential energy if the satellite moves to a circular orbit 5000 km above the surface of the earth?
(b) What is the change in kinetic energy if the satellite moves to a circular orbit 5000 km above the surface of the earth?
(c) How much work must be done on the satellite to move it to a circular orbit 5000 km above the surface of the earth?

C.mcnichol98 · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

(1 ) the beam tries to expand (or contract) by some amount due to a temperature change
(2 ) the solid in contact with the beam exerts a force to compress (or expand) it, keeping it at its original length

Answer to Question 2

(a) 7.53 108 J
(b) -3.76 x 108 J
(c) 3.76 x 108 J