Mass on a Spring: A 51.8-kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant (force constant) of the bungee cord?
A. 16.3 N/m
B. 19.6 N/m
C. 26.1 N/m
Answer: A
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A uniaxial composite material is made from 75 vol %t continuous kevlar fibers and 25 vol %t epoxy. The kevlar fibers have an elastic modulus of 131×109 Pa and a tensile strength of 4.0×109 Pa. The epoxy resin has an elastic modulus of 5×109 Pa and a tensile strength of 50×106 Pa.
(a) In a uniaxial test to failure, what component will fail first, and at what strain? (b) What is the composite stress at fracture of the first component? Assume that both the kevlar fibers and the epoxy matrix are elastic up to their failures.
Uranus rotates _______________ degrees from the _______________ to its orbit
Fill in the blank(s) with correct word
The Universe contains _____________________
a. 22.7% baryonic, 4.5% WIMPs, 72.8% dark energy b. 22.7% normal, 4.5% non-Baryonic, 72.8% dark energy c. 22.7% non-Baryonic, 4.5% normal, 72.8% dark energy d. 22.7% dark energy, 4.5% baryonic, 72.8% non-baryonic
State the general rule for significant figures when adding or subtracting numbers
What will be an ideal response?