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.
Know the building plans, the names of the two building plans, the domes and roofs of the early structures and why they were used in the cathedrals of Europe and of Byzantine Russia especially churches in Moscow.
(b) What maximum height does the ball reach relative to the floor of the elevator cab? (c) At what rate does the speed of the ball change relative to the ground (sign and magnitude)? (d) At what rate does the speed of the ball change relative to t
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A(n) 0.55 kg softball is pitched at a speed of 18 m/s. The batter hits it back directly at the pitcher at a speed of 25 m/s. The bat acts on the ball for 0.018 s. What is the magnitude of the average force exerted by the bat on the ball during con
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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