Energy in Thermal Processes

Question: Three liquids are at temperatures of 10 degrees C, 20 degrees C and 30 degrees C, respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 17 degrees C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 28 degrees C. Find the equilibri ...continues

Laws of Thermodynamics

An ideal gas initially at pressure Po, volume Vo, and temerature To is taken through the cycle described in attached file. A) Find the net work done BY the gas per cycle in terms of Po and Vo. I believe that my answer of 2Po2Vo is correct. B)What is the net energy Q added to the system per cycle? I know that I h ...continues

Currents

1. When electrons move through a metal conductor, a. they move in a straight line through the conductor. b. they move in zigzag patterns because of repeated collisions with the vibrating metal atoms. c. the temperature of the conductor decreases. d. they move at the speed of light in a vacuum. ...continues

Currents

1. In alternating current, the motion of the charges a. continuously changes in the forward and reverse directions. b. is equal to the speed of light. c. is greater than the speed of light. d. in the direction of the electric field. 2. A flashlight bulb with a potential difference of 4.5 V ac ...continues

Currents 3

1. If a lamp is measured to have a resistance of 45 ohm when it operates at a power of 80 W, what is the current in the lamp? A. 2.10 A B. 1.3 A C. 0.91 A D. 0.83 A 2. If a lamp has a resistance of 120 ohm when it operates at a power of 1.00 x 10^2 W, what is the potential difference across the ...continues

Currents 4

1. A steam turbine at an electric power plant delivers 4500 kW of power to an electrical generator that converts 95 percent of this mechanical energy into electrical energy. What is the current delivered by the generator if it delivers energy at 3600 V? 2. A color television draws about 2.5 A when it is connected to ...continues

Resistance

1. See attachment. 2. See attachment. 3. Three resistors are connected in series. Then they are connected in parallel. In which configuration will the resistance be greatest? a. series b. parallel c. It won't make any difference 4. See attachment. 5. See attachment.

Resistors 2

Problems: See attachment. Please show the formulas used, work done and the answers! Thank you!

Magnetic Field

1. ____ magnetic polies atytract, and _____ magnetic poles repel. A. like, opposite B. Opposite, opposite C. like, like D. opposite, like 2. The shape of the magnetic field surrounding a current carrying wire is A. a circle B. a square C. a rectangle D. an oval 3. The strength of a magnetic field is measured i ...continues

magnetic 2

7. If the magnetic field is represented by exes, it is a. directed to the left b. going away from you c. pointing west d. coming out of the plane of the page at you 8. A magnetic field is represented by a group of exes on the page, with an arrow to the right representing the velocity of a proton. How would the force ex ...continues