Multiple choice please help :) At John and Jay's Delicious Cookies test kitchen, engineers want to use materials to make the fastest cooling sheets for cookies after the cookies come out of the oven. The engineers are studying each material's thermal
conductivity, or how easily a material can transfer thermal energy in the form of heat.

Thermal conductivity is
measured in Wim-K.
Based on the information in the table,
Thermal Conductivity
of Different Materials
which material should the engineers use to
make the cooling sheets?

A. copper
B. bronze
C. iron
D. tungsten

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

Positive ions differ from neutral atoms in that