Asteel column with a cross section of 12 cm x 16 cm is 4 m in height and is fixed at its base. the column is braced against buckling in its weak direction only by a pin connection at the top but is unbraced in its strong direction. the column’s modulus of elasticity is 2.1 x 105 mpa. what is the maximum vertical load the column can support without bucking?

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?