Which method will correctly determine whether the forces on an object are balanced or unbalanced?
add the forces in the horizontal direction to the forces in the vertical direction.
add the forces in the horizontal and vertical directions separately.
subtract the forces in the horizontal direction from the forces in the vertical direction.
subtract the forces in the vertical direction from the forces in the horizontal direction.

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.