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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 tunnel of length L = 146 m, height H = 7.7 m high, and width 5.7 m (with a flat roof) is to be constructed at distance d = 60 m beneath the ground, What is the total weight of the ground material the columns must support
A professional boxer hits his opponent with a 1025-N horizontal blow that lasts 0.160 s. determine the opponent's final velocity after the blow
A 630-Hz sound travels through pure hydrogen. What is the speed of sound in hydrogen
A 42 ohm, 2.8 mA galvanometer is to be converted to a voltmeter that reads 178 V at full scale defection. What value of series resistance should be used with the galvanometer coil
A 0.178 kg ball is released from rest at the top of a 57.9 m tall building. Calculate the de Broglie wavelength of the ball
ball rolls horizontally off the edge of a tabletop that is 1.80 m high. It strikes the floor at a point 1.32 m horizontally away from the table edge. (Neglect air resistance.) (a) How long was the ball in the air? s (b) What was its speed at the i..
A 600 Hz sound wave travels through a gas. If the wavelength of the sound is 0.4 m, what is the speed of sound in the gas
A 878 kg car has four 11.8 kg wheels. When the car is moving, what fraction of the total kinetic energy of the car is due to rotation of the wheels about their axles
A ball is thrown upward from the ground with an initial speed of 23.90 m/s; at = same instant, a ball is dropped from a building 16 m high. After how long will the balls be at the same height.
A projectile is fired with an initial speed of 37.8m/s at an angle of 44.7 degrees above the horizontal on a long flat firing range. Determine the total time in the air
two blocks are connected by a string over a disk-shaped pulley with mass M8.5 kg and outermost readuis R = 0.10m. Calculate the acceleration of the hanging block
A hot-air balloon has just lifted off and is rising at the constant rate of 2.4m/s. how high is she when the camera reaches her
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