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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)?
What is the potential drop within the battery if the internal resistance is 4.3ohms and a current of 2.7 ampere is passed through it
Four objects are situated along the y axis as follows: a 1.94-kg object is at +2.98 m, Where is the center of mass of these objects
A charge Q1 = 1.33 %u03BCC is at rest and is located 2.30 cm away from another fixed charge Q2 = 1.95 %u03BCC. Calculate the kinetic energy of charge Q1
Start from the expression of the electric filed outside an infinite sheet of uniform surface charge density, E=sigma/2epsilon, derive the electric field
Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, What is the acceleration of the system
A particle of mass 3.67 MeV/c2 and kinetic energy 11.01 MeV collides with a stationary particle of mass 11.01 MeV/c2. Find the mass of the system after the collision
The force involved in a collision is 1.0 × 10^2 newtons. What is the value of the change in momentum
1) What is the density of water vapor in g/m3 on a hot dry day in the desert when the temperature is 40.0°C and the relative humidity is 16.0%?
A 2.54 kg particle moving along the x-axis experiences the force shown, where Fmax=6.85 N, Fmin=-6.85 N, d1=1.27 m, d2=2.54 m, d3=3.81 m, and d4=5.08 m. At x=0.00 m the particle's velocity is 3.93 m/s. What is its velocity at x=2.54 m?
a 0.065 t magnetic field passes through a circular ring of radius of 4 cm at an angle of 25 dregrees with the normal. what is the magnitude of the magnetic flux through the ring
what is the mass of helium in the balloon.
The tungsten filament of a certain 100 W light bulb radiates 4.00 W of light. Find the filament's temperature
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