A woodworker has made four small airplanes and one large
airplane. All airplanes are
exactly the same shape, and all
are made from the same kind of
wood. The larger plane is twice
as large in every dimension as
one of the smaller airplanes. The planes are to be painted and then shipped as gifts.
a. The amount of paint required to paint the planes is directly proportional to the surface area. Will the amount of paint required for the single plane in Case A be greater than, less than, or equal to the total amount of paint required for all four planes in Case B?
b. The shipping cost of the planes is proportional to the weight, which is related directly to the volume. Will the weight of the single plane in Case A be greater than, less than, or the same as the total weight of all four planes in Case B? How much more or less than (if applicable)?

Ais not a compound machine. a. bolt b. shovel c. handcart (dolly) d. see-saw (teeter totter)

Dinate system, and a charge q = - 2.00 nc is placed s2 10 n> c. (a) what is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to es from parallel to perpendicular? (b) at what absolute temperature t is the average translational kinetic energy 32 kt of a molecule equal to the change in potential energy calculated in part(: abovethistemperature, thermalagitationprevents the dipoles from aligning with the electric field.) placed in a uniform electric field e with magnitude 1.6 * 6 on the positive x-axis at x = 4.00 cm. (a) if a third charge q3 = +6.00 nc is now placed at the point x = 4.00 cm, y = 3.00 cm, find the x- and y-components of the total force exerted on this charge by the other two. (b) find the magnitude and direction of figure p21.62 ll uu 21.55 . torque on a dipole. an electric dipole with dipole moment ps is in a uniform external electric field es. (a) find the orientations of the dipole for which the torque on the dipole is zero. (b) which of the orientations in part (a) is stable, and which is unstable? (hint: consider a small rotation away from the equi- librium position and see what happens.) (c) show that for the stable orientation in part (b), the dipole’s own electric field tends to oppose the external field. 21.62 ..

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in