If 1.0 m3 of concrete weighs 5 × 10^4 N, what is the height of the tallest cylindrical concrete pillar that will not collapse under its own weight? (The compression strength of concrete is 1.7 × 10^7 N/m2)
340 m
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Gravitational lensing can be used to detect the presence of dark matter
a. True b. False Indicate whether the statement is true or false
What two energy transport mechanisms, in order from outside the core to the surface, are found in the Sun?
A) convection, conduction B) radiative diffusion, convection C) conduction, radiative diffusion D) radiative diffusion, conduction E) conduction, convection
An object is moving to the right in a straight line. The net force acting on the object is also directed to the right, but the magnitude of the force is decreasing with time. The object will
A) continue to move to the right, with its speed increasing with time. B) continue to move to the right, with its speed decreasing with time. C) continue to move to the right with a constant speed. D) stop and then begin moving to the left.
An electron has a kinetic energy that is twice its rest energy. Determine its speed
a. 0.76 c b. 0.81 c c. 0.94 c d. 0.54 c e. 0.87 c