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A 100-g piece of metal initially at 100 C is placed in a 250 gof water contained in a 300-g aluminum vessel initially at 20.o C.If the final equilibrium temperature is 25.0 C, what is the specific heat of the unknown piece of metal? What type of metal isthe unknown mostly composed of?
Carbon dioxide gas (CO2) enters a pipe at a pressure of 3.5 MPa and a temperature of 450 K at a mass flow rate of 2 kg/sec. This gas flow is cooled at a constant pressure until its temperature drops to 400 K at the exit of the pipe.
Your average speed on the first half of a car trip is 75.0 km/h. How fast do you have to drive on the second half of the trip to achieve an average speed of 83.0 km/h for the whole trip
A gas expands from I to F. The energy added to the gas by heat is 418 J when the gas goes from I to F along the diagonal path. (a) What is the change in internal energy of gas? (b) How much energy must be added to the gas by heat for indirect path..
How much energy is delivered to the battery. What is the velocity v of the smaller fish before lunch.
Mechanical Work is defined as a scalar product between the applied force, F and the displacement vector, d, of the motion, W = F · d. how much the mechanical work was done
Freight trains can produce only relatively small acceleration and decelerations. How far will it travel in each case
Two small nonconducting spheres have a total charge of 93.1 C. When placed 1.01 m apart, the force each exerts on the other is 11.5 N. What is the charge on each? What if the force was attractive?
In the figure below, the converging lens' focal length is 14.4 cm, d = 13.6 cm, and the diverging lens' focal length is -14.1 cm. Where is the image formed by the converging lens,
A low-voltage device like an electric bell obtains its electricity from a 120 V source, but requires only 4–8 V. Thus,it requires a small transformer. This often takes the form of an autotransformer, which has only one winding around a single core..
The primary winding of an step-up transformer has 100 turns and the secondary has 1300 turns. If the RMS input voltage is 110 V, what is the RMS output voltage
A solar cell has a light-gathering area of 10 cm^2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1000 W/m^2 sunlight. What is the efficiency of the solar cell
q1. a 1000 kg car travelling at a speed of 20 ms skids to a halt on wet concrete where fk 0.50. how long is the cars
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