9. Use the chart below. Which 2 of the following animals are most closely related? Explain your thinking below. (SZL1a)
Red lionfish
Seal
Lobster
Bear
Common
name
Animalia
Kingdom
Animalia
Animalia
Animalia
Phylum
Chordata
Chordata
Arthropoda
Chordata
Mammalia
Malacostraca
Mammalia
Class
Actinopterygii
Carnivora
Decapoda
Carnivora
Order
Scorpaeniformes
Nephropidae
Ursid
Phocidae
Family
Scorpaedae
Your answer

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Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?