A simply supported beam (L 5 4.5 m) with rectangular cross section (b 5 95 mm, h 5 280 mm) supports uniform load q 5 25 kN/m. The ratio of the magnitudes of the principal stresses (?1/?2) at a point a 5 1.0 m from the left support and distance d 5 100 mm up from the bottom of the beam is approximately:
(A) 9
(B) 17
(C) 31
(D) 41
(D) 41
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Differentiate between the following: navigation menu, navigation bar, and navigation tabs. What is a breadcrumb trail?
What will be an ideal response?
Rhea, Saturn's second largest moon, might best be described as:
A) having a very reflective, icy surface that is heavily cratered. B) orbiting in a highly elliptical orbit, far from Saturn. C) having the leading hemisphere six times darker than the following one. D) being composed of the densest material of any Saturnian moon and dark in appearance. E) being the only major moon of any planet not in synchronous rotation.
Which of these is true about the seasons of Uranus?
A) With a tilt of 29 degrees, they are not that different from our solstices and equinoxes. B) Its strange tilt produces extreme seasonal variations, especially at the poles. C) At the Uranian equator, the Sun would pass overhead every sixteen hours. D) At the Uranian pole the Sun sets every 16 hours during the summer and winter. E) There are no seasons at the poles.
A 2.0-kg block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If the block has a speed of 4.0 m/s as it passes through the equilibrium position, what is its speed when it is 20 cm from the equilibrium position?
a. 2.6 m/s b. 3.1 m/s c. 3.5 m/s d. 1.9 m/s e. 2.3 m/s