In a fusion bomb, what initiates, or triggers, the fusion reaction?
A) a sudden release of neutrons
B) a laser beam
C) conventional chemical explosive, designed to implode instead of explode
D) nuclear magnetic resonance
E) a fission explosion
E
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A cube of polymer that is 0.05 m on each side is to be held in place with a clamp. The clamp is designed to compress the 0.05-m-thick polymer by a constant amount of 0.0001 m to provide the clamping force. The maximum clamping force that is allowable is 1×104 N. To keep the polymer block securely clamped, the clamping force cannot fall below 0.5×104 N for one year, which is the expected life for this device. Assume that this polymer behaves as a Maxwell solid and that the viscous component is Newtonian.
(a) What is the maximum possible elastic modulus in the polymer that will result in the maximum allowable clamping force? (b) Assuming that a polymer is selected that has the highest allowable elastic modulus, what is the minimum allowable viscosity?
About 24,000 women in the United States ____ each year because of an STI they may not have even known they had.?
Fill in the blank(s) with the appropriate word(s).
Thermal Expansion: A solid object has a volume density ?0 at a temperature of 315 K. The coefficient of volume expansion for the material of which it is made is 7.00 × 10-5 K-1. What will be its density (in terms of ?0 at a temperature of 425 K, assuming that it does not melt and that its thermal properties do not change with temperature?
Fill in the blank(s) with the appropriate word(s).
Why does Mars appear fainter than Venus, as seen from Earth?
A) because of its red color B) because its two moons block the light from getting to Earth C) because it is often eclipsed by Jupiter D) because it is smaller, farther away and less reflective E) because it doesn't have water on its surface