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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?
The wire is fixed at both ends and then bowed in the middle to produce its fundamental frequency and generate a sound wave. The tube length is then adjusted until the fundamental frequency of the tube is heard. What is the length of the tube? You ..
A capacitor is connected in series with a resistor and a switch. With the switch open, the capacitor is charged to 9.0 V. When the switch is closed, how long will it take for the voltage across the capacitor to drop to 6.0 V if the time constant of t..
A harp string plays the A above middle C, vibrating at itsfundamental frequency of 440 Hz. What is the distance between the nodes of the standing wave pattern
If the speed of a particle is increased by a factor of 10, by what factor is its momentum changed, By what factor is its kinetic energy changed
you place a small lightbulb 70 cm from a concave mirror and find a real image 17 cm from the mirror. where should you
Draw a force diagram for a baseball player who slows as he slides into the base - Write the net force equations which indicate the net force on your system in both the horizontal and vertical dimensions.
What is the magnitude of the force that maintains circular motion acting on puck.
A 0.42-kg particle has a speed of 8.0 m/s at point A and kinetic energy of 7.5 J at point B. What is the total work done on the particle as it moves from A to B
A 1 000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20-s "burn." what impulse is experienced by the rocket sled
The potential energy function of a point mass is given by the expression: U(x) = 2x^2 - 8x, where x is the coordinate of the body and U is measured in Joules. Only conservative forces are acting. Find the kinetic energy of the body (in J) at the ..
A mass on a spring has an angular oscillation frequency of 2.56rad/s. The spring constant is 27.2 N/m, and the system's kinetic energy is 4.47J when t = 1.56 s. Suppose that φ = 0.00. What is the oscillation amplitude?
At what speed does the vehicle move along its descent path
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