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For premixed turbulent combustion in a propane-air mixture at atmospheric pressure and room temperature, having a laminar flame speed of 0.5 m/s, estimate the regime of turbulent combustion (weak-turbulence, distributed-reaction, etc.) for each of the following situations:
(a) The flame is stabilized just downstream from a grid having a mesh spacing of 2 mm in a wind tunnel with an average velocity of 0.6 m/s at the grid.
(b) The flame is held in a burner duct of circular cross-section, 1 m in diameter, by a transverse cylindrical rod 0.1 m in diameter, in a flow with an average velocity of 50 m/s.
(c) The flame is propagating through a cloud 10 m high in the open atmosphere, horizontally, with an ambient wind of 5 m/s.
(d) Combustion occurs in a spherical chamber 0.1 m in diameter having many inlet jets 2 mm in diameter with jet velocities of 100 m/s.
A daredevil decides to jump a canyon. Its walls are equally high and 10 m apart. What minimum speed must he have in order to clear the canyon
Suppose that three astronauts outside a spaceship decide to play catch. All three astronauts have the same mass and are equally strong. How long will the game last
Two blocks are sliding along a frictionless track. Block A (mass 3.25 kg) is moving to the right at 1.60 m/s. Block B (mass 3.90 kg) is moving to the left at 1.92 m/s. Suppose the system to be both Block A and Block B. What is the total momentum of t..
Bob (m = 60kg) is wearing a sticky suit. Just as he reaches his desired speed of 6m/s, he reaches the edge of ice (assume the ice is frictionless) and collides with a large crate (m = 250kg). Bob and the crate stick together and slide along level gro..
300 grams of water at 0 degrees are placed in a copper container weighing 120 grams in which 35 grams of ice (at 0 degrees also). 17 grams of steam at 100 degrees are fed in and completly condensed to water.
A galvanonmeter has an internal resistance of 100 Ω and deflects full-scale at 2.00 mA. what size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV?
Consider a hot-air balloon. The deflated balloon, gondola, and two passengers have a combined mass of 315 kg, Then find the temperature of the air inside the balloon
To determine the range and time of flight of a projectile and To analyze the effect of air-resistance
Two objects have exactly the same mass. If object A weighs 300N on the Moon what would Object B need to weigh on Earth?
The potential energy of two small particles in water is approximately: Write down a formula for the force between them
A Heavy rainstorm dumps 1.0 cm of rain on a city five km wide and 8 km long in a two hr period. How many metric tons (1metric ton = 10^3 kg) of water fell on the city? [1cm^3 of water has a mass of 1 gram=10^-3.] How many gallons of water was this?
suppose that a projectile which is subject to a linear resistive force is thrown down with a speed of Vyo which is greater than the terminal speed Vterm. Describe and explain how the velocity varies with time, and make a plot of Vy against t for t..
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