Suppose the date is June 21 and the Sun never sets, just touching your northern horizon at midnight. Where are you?
A) the equator
B) the Tropic of Cancer
C) the Tropic of Capricorn
D) the Arctic Circle
E) the Antarctic Circle
D
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Design a composite material made of epoxy and uniaxial E-glass fibers that has an axial elastic modulus of 50 GPa. The epoxy resin has an elastic modulus of 5 GPa, and the E-glass fibers have an elastic modulus of 72.4 GPa.
(a) What is the volum fraction of fibers and matrix in this composite? (b) What is the transverse elastic modulus of this material?
A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 350 kg/m3. The board is floating partially submerged in water of density 1000 kg/m3. What fraction of the volume of the board is above the surface of the water?
A) 0.350 B) 0.650 C) zero D) 0.200 E) The answer depends on which edge of the board is vertical.
A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s
(a) What are the magnitude and direction of the acceleration of the ball? (b) Find the tension force that the string exerts on the ball.
The formation of the supercontinent of Pangaea
A) resulted from the collision of all major land masses. B) produced widespread mountain building in the Himalayas. C) resulted in extensive volcanic activity and flood basalts. D) all of these