The air in your classroom has

A) mass.
B) weight.
C) energy.
D) all of the above
E) none of the above


Answer: D

Physics & Space Science

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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).

Physics & Space Science

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?

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science