Atugboat pulls two barges down the river. the barge connected to the tugboat, carrying coal, has an inertia of 2.5 × 105 kg, and the other barge, carrying pig iron, has an inertia of 3.5 × 105 kg. the resistive force between the coal barge and the water is 8.0 × 103 n, and the resistive force between the pig iron barge and the water is 1.0 × 104 n . the common acceleration of all three boats is 0.40 m/s2. even though the ropes are huge, the gravitational force exerted on them is much smaller than the pulling forces.

Oxygen and nutrients are moved through the body by the: a. circulatory system c. lymphatic system b. digestive system d. reproductive system

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=