15 points for 2 questions 1. your family is moving to a new home. while lifting a box 1.5m straight up to put it on a truck, you exert an upward force of 200n. calculate the amount of work you did. a) 133j b) 198.5j c) 201.5j d) 300j 2. a truck pulls a trailer at a constant velocity for a 100m while exerting a force of 480n. calculate the work done. a) 4.8j b) 380j c) 48,000j d) 580j

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

Write a hypothesis about the effect of increasing resistance on the current in the circuit. use theformat and be sure to answer the lesson question. “how do changes in voltage or resistance affect current in an electric circuit? ”

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.