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Question1
In a “Rotor-ride” at a carnival, people rotate in a vertical cylindrically walled “room.” If the room radius was 5.5 m, and the rotation frequency 0.50 revolutions per second when the floor drops out, what minimum coefficient of static friction keeps the people from slipping down? People on this ride said they were “pressed against the wall.” Is there actually an outward force pressing them against the wall? If so, what is its source? If not, what is the proper description of their situation (besides nausea)?
Question2
What is current temperature and peak wavelength of the cosmic microwave background (CMB)? Knowing that peak wavelength scales as the inverse of (1+z) where z is the redshift, even as the temperature scales as (1 + z), compute the peak wavelength and temperature at matter-radiation decoupling (z ' 1000).Will most of CMB photons, at the time of decoupling, have enough energy to ionize hydrogen atoms? So does it make sense to you that scientists say that the Universe "recombine" at this redshift (that means electrons "attach" to protons to form neutral hydrogen)?
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
What portion of jet power lost to producing sound Powdered steel is placed in a container
Introductory Mechanics: Calculate the smallest coefficient of static friction
Status Newton's First Law of motion.
Phonology: All the data for this problem come from a conservative dialect of Vèneto, a Romance language spoken in northern Italy near the city of Padua.
Calculate the dc voltage applied to the circuit.
Charge is distributed with constant volume density D throughout the rectangular box with length a, width b and height c.
Evaluate maximum altitude?
Calculate the smallest coefficient of static friction necessary for mass A to remain stationary.
Find the Band Structure and Band Occupancy
Questions on blackbody, Infra-Red Detectors & Optic Lens and Digital Image.
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