What is the largest repository of fresh water?
What will be an ideal response?
Answer: The polar ice caps and glaciers.
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The critical-stress intensity factor KIc for a glass-fiber reinforced epoxy matrix composite is 50 MPa(m)1/2, and the tensile strength is 500 MPa. In a design application, it is expected that the maximum stress is 400 MPa. What size crack could produce fracture of this composite? Assume that the geometrical factor Y is equal to 1.0.
What will be an ideal response?
What do sunspots, solar prominences, and solar flares all have in common?
A) They all occur only in the Sun's photosphere. B) They are all shaped by the solar wind. C) They are all strongly influenced by magnetic fields on the Sun. D) They all have about the same temperature.
In an exothermic reaction, bonds may be broken
What will be an ideal response?
A mass sits at rest on top of a table. Which two forces are interaction pair forces and thus are equal and opposite?
A. the force of gravity on the mass due to the earth and the force of gravity on the earth due to the mass B. the force of gravity on the mass due to the earth and the contact force on the table due to the mass C. the contact force on the mass due to the table and the force of gravity on the earth due to the mass D. the force of gravity on the mass due to the earth and the contact force on the mass due to the table