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Shown in Fig. P12.11 is a toy "helicopter" powered by air escaping from a balloon. The air from the balloon flows radially through each of the three propeller blades and out small nozzles at the tips of the blades. The nozzles (along with the rotating propeller blades) are tilted at a small angle as indicated. Sketch the velocity triangle (i.e., blade, absolute, and relative velocities) for the flow from the nozzles. Explain why this toy tends to move upward. Is this a turbine? Pump?
You drive on Interstate 10 from San Antonio to Houston, half the time at 63 km/h and the other half at 86 km/h. What is your average speed for the entire trip
a pair of eyeglass frames are made of an epoxy plastic coefficient of linear expansion 1.30 10-4degc-1. at room
A cart for hauling ore out of a gold mine has a mass of 427 kg, including its load. Find the work that the donkey performs on the cart during this process
a sea divers suit has a thickness of 5 mm and is made of a material with thermal conductivitynbspof 0.05 wmk. if the
It is known that the electric force of repulsion between two electrons is much stronger than the gravitational attraction. For two electrons at a distance d apart, calculate the ratio of the size of the electrostatic repulsion to that of the gravi..
A projectile is launched with initial speed V0, and angle A with the horizontal, What is the distance S over the ground
The energy equivalent of one gallon of gasoline is 1.3 × 108 Joule. Determine the amount of gasoline used to accelerate the car from rest to 22.7 m/s
Two cylindrical bars, each with diameter of 2.40 cm, are welded together end-to-end. One of the original bars is copper and is 0.350 m long. The other bar is gold and is 0.135 m long. What is the resistance between the ends of the welded bar at 20 oC..
A spring oscillator is designed with a mass of 0.113 kg. It operates while immersed in a damping fluid, determine the required damping constant for the system
At the start of his race, an 84-kg runner pushes against the starting block, Determine the horizontal speed of the runner after the force is exerted for 0.32s
An object is placed 61.5 cm from a screen. Where should a converging lens of focal length 5.0 cm be placed to form an image on the screen? Find the magnification of the lens.
Structures on a bird feather act like a reflection grating having 8000 lines per centimeter. What is the angle of the first-order maximum for 452 nm light?
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