Currents of 3.0 A are placed at each of four corners of a square 12 cm on a side.The two currents on top are going into the page as viewed end on, and the two on the bottom arecoming out of the page. What is the magnitude and direction of the magnetic field at the point P half way betweenthe two bottom currents?

The specific heat capacity of an ideal gas is given by Cv= A + BT . a) Firstly calculate the change in entropy in going from the state (V1, T1) to state (V2,T2). Then, b) plot the entropy as a function of temperature at constant volume , A = 5 and B = 0.05 are set for this task.

The water level of a tank on a building roof is 2657cm above ground . A tube leads from the tank bottom to the ground. The tube has a nozzle pointing straight up at the end. a) what is the maximum height to which the water could rise? b) which factors can reduce this height?

An ideal steam turbine takes in steam at the rate of 2981 Kg/h and its power output is 700 kW. Find the change in the specific enthalpy of the steam as it passes through the turbine if the entrance velocity is 60 m/s and the exit velocity is 180 m/s, with the outlet pipe 2m above the inlet.

An electrical resistance coil is placed inside a cylinder with adiabatic walls fitted with a frictionless piston and containing an ideal gas. A current of 5 A is maintained through the resistance, across which there is a voltage drop of 100 V. The piston is opposed by a constant external force of 1067 N . a ) Is the electrical energy transferred to the gas […]

How to understand position time graphs and find the answers to those questions ?

1. Calculate the size of the universe (in km), in two ways:a) rate of expansion (120 km/s) multiplied by time since the big bang (14 B yr).b) distance traveled by light between earth and the furthest star (45 B light yr),where 1 light yr = 9.4 1012 km. Multiply by 2 for diameter