A cylindrical tank is assembled by welding steel sections circumfer-entially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum stress in the heads of the tank is approximately:
(A) 38 MPa
(B) 45 MPa
(C) 50 MPa
(D) 59 MPa
(A) 38 MPa
You might also like to view...
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 2.0 seconds from the start?
A. 0.37 
B. 0.30
C. 0.28
D. 0.21
E. 0.16
The earliest human culture, involving villages and a sense of history, developed
A) about 10,000 years ago. B) about one billion years ago. C) a few million years ago. D) 100,000 to 200,000 years ago. E) about 1000 years ago.
Which of the following is true of early astronomers?
A) They knew that there were many other galaxies in the Universe. B) They thought the entire Universe consisted of Earth, the Sun, the Moon, and five other planets. C) They knew that the planets were made of rock and gas, much like Earth. D) They thought that stars were other objects like the Sun and that we lived inside a galaxy.
Two electrons are placed into separate (very tiny) one-dimensional boxes A and B. When the electrons are excited to higher energy levels and then decay to lower levels, they emit photons. The longest-wavelength spectral line from the electron in box A is observed to have the same wavelength as the third-longest spectral line from the electron in box B. The ratio of the box lengths LA/LB is equal to
A. 3/7
B. 7/3
C. 
D. 
E. 9/49