The air in your classroom has
A) mass.
B) weight.
C) energy.
D) all of the above
E) none of the above
Answer: D
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(a) Develop an equation for the time at which the plastic (viscous) strain is equal to the elastic strain in a Maxwell solid (series spring and dashpot) subject to a stress (?) where the viscous component is Newtonian (n=1).
(b) Determine the time (t) when the plastic strain is equal to the elastic strain in quartz subject to a stress of 35 MPa at 1250 K, if the viscosity is equal to 1014 Pa·s and the elastic modulus is equal to 70×109 Pa, assuming that the quartz behaves as a Maxwell solid. (c) Determine the total strain at the time (t).
A 50-gram ball moving +10 m/s collides head-on with a stationary ball of mass 100.g. The collision is elastic. What is the speed of each ball immediately after the collision?
What will be an ideal response?
A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path?
A. 4.1 cm B. 2.9 cm C. 3.4 cm D. 5.1 cm E. 2.4 cm
For which of the following would it be most advisable to utilize a system that is damped?
1.within the pendulum of a grandfather clock 2.within shock absorbers 3.within the bouncing mechanism for a trampoline 4.within a buoy that floats on the ocean