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Question: Two meteoroids are heading for earth. Their speeds as they cross the moon's orbit are 1.0 km/s.
(A) The first meteoroid is heading straight for earth. What is its speed of impact? ______ km/s ?
(B) The second misses the earth by 4000 km. What is its speed at its closest point? ______ km/s ?
Modern wind turbines are larger than they appear, and despite their apparently lazy motion, the speed of the blades tips can be quite high- many times higher than the wind speed. At the tip of the blade what is the speed
A reversible power cycle whose thermal efficiency is 40% receives 50 kJ by heat transfer from a hot reservoir at 600 K and rejects energy by heat transfer to a cold reservoir at temperature Tc. Determine the energy rejected in KJ
A cube of unknown material which is 1 m on a side is observed to float in fresh water with 30% of the cube exposed above the water line. how much of the cube (in percent) is above the water line
Estimate the maximum centrifugal and coriolis forces that you would experience on a ferris wheel in Melbourne, FL. How does this compare with gravity?
A ball of mass moving with velocity strikes a vertical wall. What is the magnitude of the average force exerted on the ball by the wall
A plane electromagnetic wave has a maximum electric field magnitude of 3.20 x 10-4 V/m. Evaluate the magnetic field amplitude
One mole of a monatomic ideal gas has an initial pressure, volume, and temperature of Po, Vo, and 335 K, respectively. Find the total heat (including the algebraic sign) for this three-step process
A block is connected between two springs on a frictionless,horizontally level track. what is the mass of the block
A parallel-plate capacitor with plates of area 420 cm2 is charged to a potential difference V and is then disconnected from the voltage source. When the plates are moved 0.4 cm farther apart, the voltage between the plates increases by 100 V.
An astronaut arrives at a new planet, and gets out his simple device to decide the gravitational acceleration there. Prior to this arrival, he noted that the radius of the planet was 7040 km. If his 0.400-m-long pendulum has a period of 1.0 s, what i..
An athlete executing a long jump leaves the ground at a 30.8 angle and travels 7.62m. What was the takeoff speed? If this speed were increased by just 4.0%, how much longer would the jump be?
A diver tucks her body in midflight, decreasing her moment of inertia by a factor of two. By what factor does her angular speed change
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