Characterize each of the following processes as being reversible (A) or irreversible (B). (Some answers may be debatable!)
(a) A living creature grows.
(b) A ball is dropped and falls freely downward.
(c) A ball rebounds elastically from a wall.
(d) A piece of hamburger meat cooks on a grill.
(e) A cube of ice melts in a glass sitting on a table.
(f) A bowling ball elastically scatters some bowling pins.
(a) A living creature grows. -B
(b) A ball is dropped and falls freely downward. -A
(c) A ball rebounds elastically from a wall. -A
(d) A piece of hamburger meat cooks on a grill. -B
(e) A cube of ice melts in a glass sitting on a table. -B
(f) A bowling ball elastically scatters some bowling pins. -B
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cable and frictionless pulley system at D is used to bring a 230-kg pole (ACB) to a vertical position as shown in the figure. The cable has tensile force T and is attached at C. The reaction force components, Ax and Ay, at A (in newtons) are:
(A) 3102, 21270
(B) 21270, 3102
(C) 21342, 4214
(D) 23102, 4204
On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary. When the spring is most compressed, both objects are moving at the same speed
Ignoring friction, what is conserved during this interaction? A) momentum and mechanical energy B) momentum only C) kinetic energy only D) momentum and kinetic energy E) momentum and potential energy
A large billet of steel initially at 260°C is placed in a radiant furnace where the surface temperature is held at 1200°C. Assuming the billet to be infinite in extent, compute the temperature at point P shown in the accompanying sketch after 25 min have elapsed. The average properties of steel are: k = 28 W/(m K), p = 7360 kg/m3, and c = 500 J/(kg K).
GIVEN
FIND
The temperature at point P shown in the accompanying sketch
ASSUMPTIONS
The billet infinite in extent
SKETCH
Which of the following statements is true regarding the stars in a stellar association?
A) They orbit a common center of mass. B) They were not formed together. C) They are gravitationally bound to one another. D) They drift away from each other in a few million years.