Abook is pushed off the edge of a table. which is true about the motion of this book? a. it falls straight down because two continuous forces are acting on it. b. its path is unpredictable because there are no continuous forces acting on it. c. its path is harmonic because two instantaneous forces are acting on it. d. it follows a parabolic path because only one continuous force is acting on it.

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?