A stepped steel shaft (G 5 75 GPa) with diameters d1 5 36 mm and d2 5 32 mm is twisted by torques T at each end. Segment lengths are L1 5 0.9 m and L2 5 0.75 m. If the allowable shear stress is 28 MPa and maximum allowable twist is 1.8°, the maximum permissible torque is approximately:
(A) 142 N?m
(B) 180 N?m
(C) 185 N?m
(D) 257 N?m
(B) 180 N?m
You might also like to view...
The sun's magnetic field is evident in the looped shapes of
a. solar flares. b. sunspots. c. the corona. d. granules. e. prominences.
Impulse: A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg of water per second, what is the minimum velocity of the stream needed to knock down the door, assuming the water doesn't bounce back?
A. 15 m/s B. 20 m/s C. 25 m/s D. 30 m/s
If sunlight broke up water molecules in Venus's atmosphere, would the hydrogen atoms es-cape into outer space? Note that Venus's temperature is 740 K. Recall that gas eventually will escape if the average velocity of its atoms is greater than 1/6 times the escape velocity of the planet. The escape velocity of Venus is 10 km/s.
a. No, the average velocity of hydrogen atoms would be 0.8 km/s. b. No, the average velocity of hydrogen atoms would be 3.9 km/s. c. Yes, the average velocity of hydrogen atoms would be 3.9 km/s. d. Yes, the average velocity of hydrogen atoms would be 25 km/s. e. No, the average velocity of hydrogen atoms would be 25 km/s.
What is the major observational difference between a Seyfert galaxy and a normal spiral galaxy?
a. Normal spiral galaxies usually have shorter spiral arms. b. Normal spiral galaxies never contain a supermassive black hole at their center. c. The central region of a Seyfert galaxy is much brighter. d. Seyfert galaxies don't contain any star formation.