How many photons does the antenna of the station emit
Your favorite radio station broadcasts at a frequency of 93.7 MHz with a power of 50.5 kW. How many photons does the antenna of the station emit in each second?
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A pair of power transmission lines each have a 1.90 resistance and carry 700 A over 9.8 km. Assume that the rms input voltage is 42 kV.
Bereken de maximale verplaatsing f (mm) die is toegestaan op een pakket van drie veren. De E-modulus bedraagt E = 210 GPa. Beschouw drie bladveren met elk een breedte b=40 mm en een hoogte h=10 mm.
In a survey, 3 of 4 students said the court show "too much concern" for the criminals. Find the probability that AT MOST 3 out of 7 randomly selected students will agree with this statement.
The refrigerator is located in a room that is maintained at a constant temperature of 25 degrees celsius. What is the minimum amount of work required to achieve water cooling (in kj)?
A piston-cylinder device contains steam initially at 1 MPa, 450°C, and 2.5 m3. Steam is allowed to cool at constant pressure until it first starts condensing.
An adiabotic nozzle handling air (ideal gas with constant specific heats) has operating conditions. What is the mass flow rate at the inlet section in kg/sec?
The diameter of a brand of Ping-Pong balls is approximately normally distributed, with a mean of 1.32 inches and a standard deviation of 0.04 inch. A random sample of 4 Ping-Pong balls is selected. What is the probability that the sample mean is l
A radioactive isotope has an activity of 9.32 × 104 Bq initially. After 3.55 hours the activity is 6.71×104 Bq. A.) What is the half-life of the isotope?
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