A closed system consists of 0.5 kmol of

1)      A piston–cylinder device, with a set of stops on the top, initially contains 3 kg of air at 200 kPa and 27 C. Heat is now transferred to the air, and the piston rises until it hits the stops, at which point the volume is twice the initial volume. More heat is transferred until the pressure inside the cylinder also doubles. Determine the work done and the amount of heat transfer for this process. Also, show the process on a P-v diagram

While exploring a cave,a spelunker stats at the entrance and move the following distance.She goes 75m North,250m East,125m at an angle of 30° north of east and 150m south.Find the resultant displacement from entrance.?

A picture window has dimensions of 1.40 m x p m and is made of glass 5.20 mm thick. On a winter day, the outside temperature is -20  while the inside temperature is a comfortable 19.56 °C. If the rate of  heat  loss through the window is 5.7 x  J/sFind the value of p                                                                                      (3 marks)How much heat flows through the window in one hour?                           (3 marks)

A 95.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.80 m/s2 , (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.30 m/s2 ?

The voltage v(t) across a device and the current i(t) through it are v(t) = 20 sin (4t) V and i(t) = 10(1 + e−2t ) mA Calculate: (a) the total charge in the device at t = 1 s, q(0) = 0.

how long will take a 1750w motor to lift a 285kg piano to six-story window 16m above

a horizontal force is applied to a 4kg box, which is initially at rest on a rough horizontal table.The coefficient of kinetic friction between the box and the table is 0.35 find the speed of the box after it has been pushed 3m

An image is located 289 mm behind a converging lens with 125-mm focal-length. Find the object distance.
 

Suppose you are sliding a block of ice across a flat, horizontal field as shown in the figure. the mass of the ice block is 125.0 kg and the force applied by you is F=400.0 N. If the coefficient of the kinetic friction between the block and the surface is 0.05, find the frictional force acting on the ice block