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A 20.0cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of the sound in air at 0 degree C is 331 m/s. What is the frequency of the third mode (second overtone)?
A 73 kg parachutist descends during a vertical height of 420 m with constant speed. Find the increase in entropy produced by the parachutist; assume the air temperature is 21°C.
A car decelerates uniformly and comes to a stop after 10s. The car's velocity was 50 km/h. What was the car's deceleration
If a hot air balloon floats at a constant elevation (it has reached equilibrium) where the local atmospheric pressure is 98 kPa (abs) and outside air temperature is 285 K, and the hot air inside the balloon is at 400 K
1.9*10^20photons per second are emitted by a 70W lightbulb, the wavelength is 550nm. How many photons per second are entering the pupil
A beam of thermal neutrons emerges from a nuclear reactor and is incident on a crystal. Find the Bragg- scattering angle that results in a scattered beam of this energy
A 1.00 kg beaker containing 2.00 kg of oil (density=900kg/m^3 rests on a scale, Find the equilibrium readings of both scales
A ball traveling with an initial momentum of 3.5 kg•m/s bounces off a wall and comes back in the opposite direction with a momentum of -3.5 kg•m/s
Three point charges are located near a spherical Gaussian surface of radius R = 6 cm. What is the electric flux through this surface
Power windmills turn in response to the force of high-speed drag. For a sphere moving through a fluid, the resistive force, FR is pro- portional to r2v2, where r is the radius of the sphere and v is the fluid speed.
Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.5 mm. What is the resistance ratio RA/RB, measured between their ends
Now the gymnast (not holding any additional mass) walks directly above the right support. What is the force the left support exerts on the beam
A beam of parallel rays from a 24 MHz citizens band radio transmitter passes between two electrically conducting (hence opaque to radio waves) buildings located 45.00 m apart. What is an angular width of the beam as it emerges from between the buildi..
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