(1) Explain why the feet of camels and wading birds have the shapes that they have. (2) Two birds have the same mass, but one has much bigger feet. How would the pressure that they produce on the ground be different?
(3) What would happen if you tried using a road bike to ride across a soft surface? Explain your answer.
(4) Two horses have hooves of about the same area. Horse A has a much bigger mass than horse B. How would the pressure they produce on the ground be different?

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

These models show the electron structures of two different nonmetal elements. which element is likely more reactive, and why? element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table. element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table. element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons. element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?