Speed of sound of hiker voice in air
A hiker shouts toward a vertical cliff 740 m away. The echo is heard 4.00 s later. What is the speed of sound of the hiker's voice in air?
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An object has a kinetic energy of 232 J and a momentum of magnitude 26.3 kg·m/s. Find the speed and the mass of the object.
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As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. The spacecraft's mass is 291 kg and the thrust (force) of the rocket engines is 59 N. If the speed of the spacecra
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The masses of the earth and moon are 5.98x1024 and 7.35x1022 kg, respectively. Identical amounts of charge are placed on each body, such that the net force (gravitational plus electrical) on each is zero. What is the magnitude of the charge placed
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