Dolphin in sea water emits a sound
A dolphin in 25°C sea water emits a sound directly toward the bottom of the ocean 105 m below. How much time passes before it hears an echo? (The speed of sound in sea water is 1530 m/s.)
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A uniform electric field with a magnitude of 6270 N/C points in the positive x direction. Find the change in electric potential energy when a +12.5 µC charge is moved 5.16 cm in the following directions.
What is the balanced chemical reactions when carbon dioxide reacts with water? How can carbon dioxide change the pH of water and what happens to the pH when this happens, does it go up or down?
Suppose that a data set has a minimum value of 24 and a maximun of 79 and that you want 5 classes. Explain how to find the class width for this frequency table. What happens if you mistakenly use a class width of 11 of 12?
An air conditioner running with R-134a on a cycle executed under the saturation dome between the pressure limits of 0.8 MPa and 0.12 MPa.
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Air at 300 K and 200 kPa is throttled by a valve to pressure of 100 kPa. If the valve is adiabatic and the change in kinetic energy is negligible, calculate the temperature of air after throttling.
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