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You are called as an expert witness to analyze the fracture of a sintered silicon carbide plate that was fractured in bending when a blunt load was applied to the plate center. Measurement of the distance between the fracture origin and the mirror/mist boundary on the fracture surface gives a radius of 0.796 mm. You are given three pieces of the same SiC to test, and you determine that the mirror radius is 0.603, 0.203, and 0.162 mm for bending failure stress levels of 225, 368, and 442 MPa, respectively. What is your estimate of the stress present at the time of fracture for the original plate?
After a snow storm, the roof on one house, H1, isuniformly covered by snow, whereas at the house next door, H2, the snow has completely melted off. A likely reason for this is:
A spaceship is moving at a speed ot 0.9c away from an observer at rest. What is the speed of the protons measured by the observer at rest when the gun is shot away from the observer
A 160 kilogram object and a 460 kilogram object are separated by 4.70 meter. Obtain the magnitude of the net gravitational force exerted by these objects on a 30 kilogram object located midway between them
A rocket starts from rest and moves upward from the surface of the earth, What is the speed of the rocket when it is 340m above the surface of the earth
A force of 720 Newton stretches a certain spring a distance of 15 centimeter. Find what is its force constant? If a 60 kilogram mass is hung on it, find how far will it stretch
High-speed photos of a 220 microg flea jumping vertically indicate that the jump lasts 1.2 ms, What is the flea's change in momentum during its jump
two thin rods of length l lie along the x-axis one between xa2 and xa2l and the other between x - a2 and x - a2 - l.
To weigh a fish, a person hangs a tackle box of mass 3.5 kilogramsand a cooler of mass 5 kilograms from the ends of a uniform rigidpole that is suspended by a rope attached to its center. What is the mass of the fish
two capacitors have the same plate separation but one has square plates and the other has circular plates. the square
On a frictionless, horizontal air table, puck C (with mass 0.250 kilogram) is moving toward puck D (with mass 0.290 kilogram), Determine the change in the total kinetic energy of the system
a helicopter is lifting two crates simultaneously. one crate with a mass of 148 kg is attached to the helicopter by
a skateboarder shoots off a ramp with a velocity of 6.8 ms directed at an angle of 59deg above the horizontal. the end
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