A particle with a mass of 400 g moving at 2.0 m/s collides elastically with a stationary particle whose mass is 240 g. After the collision, the 400 g mass is moving at 1.5 m/s. Through what angle is its path deflected?
A)
35°
B)
15°
C)
25°
D)
30°
E)
20°
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 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8 c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
a. 2 years younger b. 2 years older c. 3 years older d. 10 years older e. 8 years older
A steel tube with diameters d2 5 86 mm and d1 5 52 mm is twisted by torques at the ends. The diameter of a solid steel shaft that resists the same torque at the same maximum shear stress is approximately:
(A) 56 mm
(B) 62 mm
(C) 75 mm
(D) 82 mm
What do we mean when we say that the universe is expanding?
A) Average distances between galaxies are increasing with time. B) Within galaxies, average distances between star systems are increasing with time. C) Everything in the universe is gradually growing in size. D) The statement is not meant to be literal; rather, it means that our knowledge of the universe is growing.