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During a circus act, one performer swings upside down hanging from a trapeze holding another, also upside-down, performer by the legs. If the upward force on the lower performer is three times her weight, how much (in m) do the bones (the femurs) in her upper legs stretch? You may assume each is equivalent to a uniform rod 30.0 cm long and 1.70 cm in radius. Her mass is 57.5 kg.
So as to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast must an airplane be moving at the top of a vertical circle with a radius of 1545 m.
A very long solenoid of radius a and height h has N closely wound turns of coil. Suppose there is an increasing current I(t) that runs through the coils. Consider a point P inside the solenoid (i.e. at r
A certain playground merry-go-round is essentially an 80-kg iron disk 2.0 m in radius. How long does it take the merry-go-round to complete a revolution now
What was the magnifying power of the early simple microscope?
An object is oscilliating on a spring with a period of 4.60 s . At time t= 0.00 s the object has zero speed and is at x = 8.30 cm . What is the acceleration of the object at t= 2.50 s ?
it takes the elevator in a skyscraper 4.0 to reach its cruising speed of 10 . a 60 passenger gets aboard on the ground
A roller coaster executes a 10 m radius loop the loop at a speed of 20 m/s. How heavy does a 50 kg passenger feel at the top of the loop
An electron gun fires individual charges at a time, a negative charge is fired by speed V, moving parallel to a very long wire carrying a steady current I as shown.
a student exchanges the stock headphones b1 89 db for her mp3 player for a new set that is louder b2 94.5db. if the
A 12cm tall robin sits in a tree 1.500 m above a shiny lawn sphere with a diameter of 48.00 cm. How tall does the image of the robin appear as he sees his reflection? Use a ray diagram and the equations to locate and completely describe the image.
question1 two wires hold up a massive beam of length l16 m and mass 330 kg. a box of mass 220 kg hangs from a wire that
In a proton linear accelerator, a 8.4mA proton current hits a target. How many protons hit the target each second
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