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Q. A space station is constructed in the shape of a wheel 25 in diameter, with essentially all of its 5.10×10^5 mass at the rim. Once the station is completed, it is set rotating at a rate that requires an object at the rim to have radial acceleration, thereby simulating Earth's surface gravity. This is accomplished using two small rockets, each with 150 thrust, which are mounted on the rim of the station. How long would it take to reach the desired spin rate?
At a factory, a noon whistle is sounding with a frequency of 497 Hz. As a car traveling at 84km/h approaches the factory, driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change i..
A machine part rotates at an angular speed of 0.48 rad/s; its speed is then increased to 2.8 rad/s at the angular acceleration of 0.61 rad/s2.
A block weighing 60.0 N rests on a plane inclined at 25.0° to the horizontal. A force F is applied to the object at 44.0° to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and the pla..
In a common but dangerous prank, a chair is pulled away as a person is moving downward to sit on it, causing the victim to land hard on the floor.
A car moving at 10 m/s crashes into a barrier and stops in 0.50s. There is a 20kg child in the car. Suppose that the child's velocity is changed by the same amount as the cars in the same time period.
One way to measure on another planet or moon by remote sensing is to measure how long it takes an object to fall a given distance. A lander vehicle on a distant planet records the fact that it takes 3.17 for a ball to fall freely 11.26.
A rectangular container measuring 24 cm 48 cm 55 cm is filled with water. What is the mass of volume of water in kilograms.
A 1500-kg car moving east at 28.00m/s collides with a 1720 kg car moving south at 15 m/s and the two cars stick together.
What is minimum important in returning blood to the heart? Negative intrathoracic pressure, valves and veins, the pumping action of skeletal muscles, or the pushing of blood by arterial system.
A crate of 30.2- tools rests on a horizontal floor. You exert a regularly increasing horizontal push on it and observe that the crate just begins to move while your force exceeds 319. After that you must reduce your push to 227 to keep it moving at a..
How many joules of kinetic energy does a 750 automobile traveling at a typical highway speed of 65 have.
The Hall voltage across a conductor in a 55 magnetic field is 1.9 . When used with the same current in a different magnetic field, the voltage across the conductor is 3.
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