Probability that from a random sample
In a certain college 33% of the physics majors belon to ethnic minorities. Find the probability that from a random sample of 10 physics majors, no more than 6 belong to an ethnic minority.
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Radio astronomers detect electromagnetic radiation at 44.0 MHz from an interstellar gas cloud. They suspect this radiation is emitted by electrons spiraling in a magnetic field. What is the magnetic field strength inside the gas cloud?
There is also a heat loss per unit mass of 5 kJ/kg. Kinetic and potential energy effects are negligible. What is the mass flow rate through the compressor?
(a) Draw a free body diagram of the radio and the forces on it. (b) Calculate the acceleration on the radio. Express your answer in component and magnitude angle notation.
Bicyclists in the Tour de France do enormous amounts of work during a race. For example, the average power per kilogram generated by Lance Armstrong (m = 75.0 kg) is 6.50 W per kilogram of his body mass.
On a summer day when the temperature is 80 degrees F, a trash fire emits 30,000 Btu to the atmosphere.By how much has the entropy of the atmosphere increased?
At a distance from a point charge, the electric potential is 3400 and the magnitude of the electric field is 2.0×105 . What is the distance ? What is the electric potential at distance from the charge?
Determine the entropy change of the wood and the oil. Use properties of engine oil for the oil, and neglect the fact that oil will soak into the wood.
What is the standard deviation of Pan's driving time on a day in which he encounters two red lights? What is the probability the Pan spent less than 15 minutes to drive to school today?
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