A boulder falls off a cliff toward the ground with no air resistance. The isolated system for which momentum is conserved is
1.only the Earth.
2.only the boulder.
3.both the Earth and the boulder.
4.none of these.
3
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For the aluminum alloy 7075-T6, shown in Figure 11.23, a stress amplitude of 250 MPa is applied for 106 cycles to a group of 100 specimens. How many of these specimens should fail in this test?
What will be an ideal response?
Entropy: When water at 0°C freezes, the entropy of the water
A. increases. B. decreases. C. remains constant. D. could either increase or decrease; it depends on other factors.
The Schwarzchild radius is defined for a given mass M as the radius for which the escape velocity would be exactly equal to the speed of light, c. What is the expression for this radius in terms of G, M, and c?
What will be an ideal response?
Gas, ______________, and pyroclastics are the three general products emitted during a volcanic eruption
Fill in the blank(s) with correct word