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Question: A juvenile elephant has a mass of 300kg. He wishes to fly using his very large ears. If the air speed on top of his ears is 30m/s and the speed below his ears is 22m/s, find the total surface area of his two ears.
A ski jumper has 1.2 ´ 10 J of potential energy at the top of the ski jump. The friction on the jump slope is small, but not negligible. What can you end about the ski jumper's kinetic energy at the bottom of the jump.
A helicopter is ascending vertically with a speed of 5.03m/s. How much time does it take for the package to reach the ground
You have a concave spherical mirror with a 10.3-cm radius of curvature. You place an object on the mirror\'s axis, How far is the object\'s image from the mirror
An electron is fired directly toward the center of a large metal plate that has excess negative charge with surface charge density 2.00×10-6 C/ m2. how far from the plate must it be fired
An airoplane takeoff speed is 320km/h. if its average acceleration is 2.9m/s^2, how long is it on runway after starting its takeoff roll.
A ball of mass 0.240 grams and positive charge, q =39.3 microC, is suspended on a string of negligible mass in a uniform electric field. We observe that ball hangs at an angle of theta =15.0 o from the vertical. What is the magnitude of electric f..
A lens for a 35-mm camera has a focal length given by f = 67 mm. What is the magnification of the image on the film
A 4.1-m-tall, 30-cm-diameter concrete column supports a 2.0×10^5kg load. By how much is the column compressed
The nucleus of a hydrogen atom is a single proton, which has a radius of about 1.2 × 10-15 m. What is the ratio of the density of the hydrogen nucleus to the density of the complete hydrogen atom
A volume of 7.2 m3 of glycerol (η = 0.934 Pa. s) is pumped through a 15 m length of pipe in 55minutes. The pressure at the input end of the pipe is 8.6 x105 Pa, and the pressure at the output end isatmospheric pressure. What is the pipe's radius?
At a coal-burning power plant a steam turbine is operated with a power output of 548 MW. At what rate must heat be supplied to the power plant by burning coal
Two balls of the same mass areaccelerated by the different net forces such that one ball gains avelocity twice that of the other ball in the process.
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