Which of these would typically be among the brightest stars in an ancient globular cluster?
A) A4 B) K3 C) O3 D) B3 E) M5
B
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An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no effects of air?
A) 0.50 s B) 0.88 s C) 1.1 s D) 2.5 s E) 0.54 s
A composite material is made of 50 % uniaxial glass fibers and 50% epoxy resin. The epoxy matrix is cured at 150ºC and then cooled to 25ºC. The elastic modulus of the glass fibers is 76 GPa, and the thermal expansion coefficient is 5×10-6 °C-1 . The elastic modulus of the epoxy resin is 4 GPa, and the thermal expansion coefficient is 60×10-6 °C-1 .
(a) Calculate the thermal stresses, both the magnitude and sign, in the matrix and in the fibers after the cured composite is cooled to room temperature. Assume that each material is elastic. (b) Calculate the composite strain in cooling from 150°C to 25°C.
Which does NOT belong to the same family?
A) infrasonic waves B) ultrasonic waves C) radio waves D) shock waves E) longitudinal waves
The Cassini Division is in between which two rings? I. A II. B III. C IV. F
a. I and II b. II and III c. III and IV d. II and IV